^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) #include <linux/pagewalk.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) #include <linux/vmacache.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) #include <linux/hugetlb.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) #include <linux/huge_mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) #include <linux/mount.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) #include <linux/seq_file.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include <linux/highmem.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/ptrace.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/pagemap.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/mempolicy.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/rmap.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/swap.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/sched/mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/swapops.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/mmu_notifier.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/page_idle.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/shmem_fs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <linux/uaccess.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <linux/pkeys.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #include <asm/elf.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #include <asm/tlb.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #include <asm/tlbflush.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #include "internal.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) #define SEQ_PUT_DEC(str, val) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) seq_put_decimal_ull_width(m, str, (val) << (PAGE_SHIFT-10), 8)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) void task_mem(struct seq_file *m, struct mm_struct *mm)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) unsigned long text, lib, swap, anon, file, shmem;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) unsigned long hiwater_vm, total_vm, hiwater_rss, total_rss;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) anon = get_mm_counter(mm, MM_ANONPAGES);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) file = get_mm_counter(mm, MM_FILEPAGES);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) shmem = get_mm_counter(mm, MM_SHMEMPAGES);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) * Note: to minimize their overhead, mm maintains hiwater_vm and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) * hiwater_rss only when about to *lower* total_vm or rss. Any
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) * collector of these hiwater stats must therefore get total_vm
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) * and rss too, which will usually be the higher. Barriers? not
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) * worth the effort, such snapshots can always be inconsistent.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) hiwater_vm = total_vm = mm->total_vm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) if (hiwater_vm < mm->hiwater_vm)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) hiwater_vm = mm->hiwater_vm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) hiwater_rss = total_rss = anon + file + shmem;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) if (hiwater_rss < mm->hiwater_rss)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) hiwater_rss = mm->hiwater_rss;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) /* split executable areas between text and lib */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) text = PAGE_ALIGN(mm->end_code) - (mm->start_code & PAGE_MASK);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) text = min(text, mm->exec_vm << PAGE_SHIFT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) lib = (mm->exec_vm << PAGE_SHIFT) - text;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) swap = get_mm_counter(mm, MM_SWAPENTS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) SEQ_PUT_DEC("VmPeak:\t", hiwater_vm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) SEQ_PUT_DEC(" kB\nVmSize:\t", total_vm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) SEQ_PUT_DEC(" kB\nVmLck:\t", mm->locked_vm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) SEQ_PUT_DEC(" kB\nVmPin:\t", atomic64_read(&mm->pinned_vm));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) SEQ_PUT_DEC(" kB\nVmHWM:\t", hiwater_rss);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) SEQ_PUT_DEC(" kB\nVmRSS:\t", total_rss);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) SEQ_PUT_DEC(" kB\nRssAnon:\t", anon);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) SEQ_PUT_DEC(" kB\nRssFile:\t", file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) SEQ_PUT_DEC(" kB\nRssShmem:\t", shmem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) SEQ_PUT_DEC(" kB\nVmData:\t", mm->data_vm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) SEQ_PUT_DEC(" kB\nVmStk:\t", mm->stack_vm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) seq_put_decimal_ull_width(m,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) " kB\nVmExe:\t", text >> 10, 8);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) seq_put_decimal_ull_width(m,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) " kB\nVmLib:\t", lib >> 10, 8);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) seq_put_decimal_ull_width(m,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) " kB\nVmPTE:\t", mm_pgtables_bytes(mm) >> 10, 8);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) SEQ_PUT_DEC(" kB\nVmSwap:\t", swap);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) seq_puts(m, " kB\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) hugetlb_report_usage(m, mm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) #undef SEQ_PUT_DEC
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) unsigned long task_vsize(struct mm_struct *mm)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) return PAGE_SIZE * mm->total_vm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) unsigned long task_statm(struct mm_struct *mm,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) unsigned long *shared, unsigned long *text,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) unsigned long *data, unsigned long *resident)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) *shared = get_mm_counter(mm, MM_FILEPAGES) +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) get_mm_counter(mm, MM_SHMEMPAGES);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) *text = (PAGE_ALIGN(mm->end_code) - (mm->start_code & PAGE_MASK))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) >> PAGE_SHIFT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) *data = mm->data_vm + mm->stack_vm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) *resident = *shared + get_mm_counter(mm, MM_ANONPAGES);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) return mm->total_vm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) #ifdef CONFIG_NUMA
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) * Save get_task_policy() for show_numa_map().
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) static void hold_task_mempolicy(struct proc_maps_private *priv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) struct task_struct *task = priv->task;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) task_lock(task);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) priv->task_mempolicy = get_task_policy(task);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) mpol_get(priv->task_mempolicy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) task_unlock(task);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) static void release_task_mempolicy(struct proc_maps_private *priv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) mpol_put(priv->task_mempolicy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) static void hold_task_mempolicy(struct proc_maps_private *priv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) static void release_task_mempolicy(struct proc_maps_private *priv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) static void seq_print_vma_name(struct seq_file *m, struct vm_area_struct *vma)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) const char __user *name = vma_get_anon_name(vma);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) struct mm_struct *mm = vma->vm_mm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) unsigned long page_start_vaddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) unsigned long page_offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) unsigned long num_pages;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) unsigned long max_len = NAME_MAX;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) page_start_vaddr = (unsigned long)name & PAGE_MASK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) page_offset = (unsigned long)name - page_start_vaddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) num_pages = DIV_ROUND_UP(page_offset + max_len, PAGE_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) seq_puts(m, "[anon:");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) for (i = 0; i < num_pages; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) int len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) int write_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) const char *kaddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) long pages_pinned;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) struct page *page;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) pages_pinned = get_user_pages_remote(mm, page_start_vaddr, 1, 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) &page, NULL, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) if (pages_pinned < 1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) seq_puts(m, "<fault>]");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) kaddr = (const char *)kmap(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) len = min(max_len, PAGE_SIZE - page_offset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) write_len = strnlen(kaddr + page_offset, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) seq_write(m, kaddr + page_offset, write_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) kunmap(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) put_user_page(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) /* if strnlen hit a null terminator then we're done */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) if (write_len != len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) max_len -= len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) page_offset = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) page_start_vaddr += PAGE_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) seq_putc(m, ']');
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) static void *m_start(struct seq_file *m, loff_t *ppos)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) struct proc_maps_private *priv = m->private;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) unsigned long last_addr = *ppos;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) struct mm_struct *mm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) struct vm_area_struct *vma;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) /* See m_next(). Zero at the start or after lseek. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) if (last_addr == -1UL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) priv->task = get_proc_task(priv->inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) if (!priv->task)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) return ERR_PTR(-ESRCH);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) mm = priv->mm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) if (!mm || !mmget_not_zero(mm)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) put_task_struct(priv->task);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) priv->task = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) if (mmap_read_lock_killable(mm)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) mmput(mm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) put_task_struct(priv->task);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) priv->task = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) return ERR_PTR(-EINTR);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) hold_task_mempolicy(priv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) priv->tail_vma = get_gate_vma(mm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) vma = find_vma(mm, last_addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) if (vma)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) return vma;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) return priv->tail_vma;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) static void *m_next(struct seq_file *m, void *v, loff_t *ppos)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) struct proc_maps_private *priv = m->private;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) struct vm_area_struct *next, *vma = v;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) if (vma == priv->tail_vma)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) next = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) else if (vma->vm_next)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) next = vma->vm_next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) next = priv->tail_vma;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) *ppos = next ? next->vm_start : -1UL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) return next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) static void m_stop(struct seq_file *m, void *v)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) struct proc_maps_private *priv = m->private;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) struct mm_struct *mm = priv->mm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) if (!priv->task)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) release_task_mempolicy(priv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) mmap_read_unlock(mm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) mmput(mm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) put_task_struct(priv->task);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) priv->task = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) static int proc_maps_open(struct inode *inode, struct file *file,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) const struct seq_operations *ops, int psize)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) struct proc_maps_private *priv = __seq_open_private(file, ops, psize);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) if (!priv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) priv->inode = inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) priv->mm = proc_mem_open(inode, PTRACE_MODE_READ);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) if (IS_ERR(priv->mm)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) int err = PTR_ERR(priv->mm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) seq_release_private(inode, file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) static int proc_map_release(struct inode *inode, struct file *file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) struct seq_file *seq = file->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) struct proc_maps_private *priv = seq->private;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) if (priv->mm)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) mmdrop(priv->mm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) return seq_release_private(inode, file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) static int do_maps_open(struct inode *inode, struct file *file,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) const struct seq_operations *ops)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) return proc_maps_open(inode, file, ops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) sizeof(struct proc_maps_private));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) * Indicate if the VMA is a stack for the given task; for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) * /proc/PID/maps that is the stack of the main task.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) static int is_stack(struct vm_area_struct *vma)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) * We make no effort to guess what a given thread considers to be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) * its "stack". It's not even well-defined for programs written
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) * languages like Go.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) return vma->vm_start <= vma->vm_mm->start_stack &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) vma->vm_end >= vma->vm_mm->start_stack;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) static void show_vma_header_prefix(struct seq_file *m,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) unsigned long start, unsigned long end,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) vm_flags_t flags, unsigned long long pgoff,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) dev_t dev, unsigned long ino)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) seq_setwidth(m, 25 + sizeof(void *) * 6 - 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) seq_put_hex_ll(m, NULL, start, 8);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) seq_put_hex_ll(m, "-", end, 8);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) seq_putc(m, ' ');
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) seq_putc(m, flags & VM_READ ? 'r' : '-');
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) seq_putc(m, flags & VM_WRITE ? 'w' : '-');
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) seq_putc(m, flags & VM_EXEC ? 'x' : '-');
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) seq_putc(m, flags & VM_MAYSHARE ? 's' : 'p');
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) seq_put_hex_ll(m, " ", pgoff, 8);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) seq_put_hex_ll(m, " ", MAJOR(dev), 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) seq_put_hex_ll(m, ":", MINOR(dev), 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) seq_put_decimal_ull(m, " ", ino);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) seq_putc(m, ' ');
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) static void
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) show_map_vma(struct seq_file *m, struct vm_area_struct *vma)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) struct mm_struct *mm = vma->vm_mm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) struct file *file = vma->vm_file;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) vm_flags_t flags = vma->vm_flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) unsigned long ino = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) unsigned long long pgoff = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) unsigned long start, end;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) dev_t dev = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) const char *name = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) if (file) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) struct inode *inode = file_inode(vma->vm_file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) dev = inode->i_sb->s_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) ino = inode->i_ino;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) pgoff = ((loff_t)vma->vm_pgoff) << PAGE_SHIFT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) start = vma->vm_start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) end = vma->vm_end;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) show_vma_header_prefix(m, start, end, flags, pgoff, dev, ino);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) * Print the dentry name for named mappings, and a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) * special [heap] marker for the heap:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) if (file) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) seq_pad(m, ' ');
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) seq_file_path(m, file, "\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) goto done;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) if (vma->vm_ops && vma->vm_ops->name) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) name = vma->vm_ops->name(vma);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) if (name)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) goto done;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) name = arch_vma_name(vma);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) if (!name) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) if (!mm) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) name = "[vdso]";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) goto done;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) if (vma->vm_start <= mm->brk &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) vma->vm_end >= mm->start_brk) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) name = "[heap]";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) goto done;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) if (is_stack(vma)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) name = "[stack]";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) goto done;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) if (vma_get_anon_name(vma)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) seq_pad(m, ' ');
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) seq_print_vma_name(m, vma);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) done:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) if (name) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) seq_pad(m, ' ');
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) seq_puts(m, name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) seq_putc(m, '\n');
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) static int show_map(struct seq_file *m, void *v)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) show_map_vma(m, v);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) static const struct seq_operations proc_pid_maps_op = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) .start = m_start,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) .next = m_next,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) .stop = m_stop,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) .show = show_map
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) static int pid_maps_open(struct inode *inode, struct file *file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) return do_maps_open(inode, file, &proc_pid_maps_op);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) const struct file_operations proc_pid_maps_operations = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) .open = pid_maps_open,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) .read = seq_read,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) .llseek = seq_lseek,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) .release = proc_map_release,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) * Proportional Set Size(PSS): my share of RSS.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) * PSS of a process is the count of pages it has in memory, where each
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) * page is divided by the number of processes sharing it. So if a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) * process has 1000 pages all to itself, and 1000 shared with one other
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) * process, its PSS will be 1500.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) * To keep (accumulated) division errors low, we adopt a 64bit
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) * fixed-point pss counter to minimize division errors. So (pss >>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) * PSS_SHIFT) would be the real byte count.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) * A shift of 12 before division means (assuming 4K page size):
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) * - 1M 3-user-pages add up to 8KB errors;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) * - supports mapcount up to 2^24, or 16M;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) * - supports PSS up to 2^52 bytes, or 4PB.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) #define PSS_SHIFT 12
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) #ifdef CONFIG_PROC_PAGE_MONITOR
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) struct mem_size_stats {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) unsigned long resident;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) unsigned long shared_clean;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) unsigned long shared_dirty;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) unsigned long private_clean;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) unsigned long private_dirty;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) unsigned long referenced;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) unsigned long anonymous;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) unsigned long lazyfree;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) unsigned long anonymous_thp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) unsigned long shmem_thp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) unsigned long file_thp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) unsigned long swap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) unsigned long shared_hugetlb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) unsigned long private_hugetlb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) u64 pss;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) u64 pss_anon;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) u64 pss_file;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) u64 pss_shmem;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) u64 pss_locked;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) u64 swap_pss;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) bool check_shmem_swap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) static void smaps_page_accumulate(struct mem_size_stats *mss,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) struct page *page, unsigned long size, unsigned long pss,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) bool dirty, bool locked, bool private)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) mss->pss += pss;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) if (PageAnon(page))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) mss->pss_anon += pss;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) else if (PageSwapBacked(page))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) mss->pss_shmem += pss;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) mss->pss_file += pss;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) if (locked)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) mss->pss_locked += pss;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) if (dirty || PageDirty(page)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) if (private)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) mss->private_dirty += size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) mss->shared_dirty += size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) if (private)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) mss->private_clean += size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) mss->shared_clean += size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) static void smaps_account(struct mem_size_stats *mss, struct page *page,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) bool compound, bool young, bool dirty, bool locked,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) bool migration)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) int i, nr = compound ? compound_nr(page) : 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) unsigned long size = nr * PAGE_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) * First accumulate quantities that depend only on |size| and the type
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) * of the compound page.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) if (PageAnon(page)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) mss->anonymous += size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) if (!PageSwapBacked(page) && !dirty && !PageDirty(page))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) mss->lazyfree += size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506) mss->resident += size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507) /* Accumulate the size in pages that have been accessed. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) if (young || page_is_young(page) || PageReferenced(page))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509) mss->referenced += size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) * Then accumulate quantities that may depend on sharing, or that may
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) * differ page-by-page.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515) * page_count(page) == 1 guarantees the page is mapped exactly once.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) * If any subpage of the compound page mapped with PTE it would elevate
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) * page_count().
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519) * The page_mapcount() is called to get a snapshot of the mapcount.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520) * Without holding the page lock this snapshot can be slightly wrong as
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) * we cannot always read the mapcount atomically. It is not safe to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522) * call page_mapcount() even with PTL held if the page is not mapped,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523) * especially for migration entries. Treat regular migration entries
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524) * as mapcount == 1.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526) if ((page_count(page) == 1) || migration) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) smaps_page_accumulate(mss, page, size, size << PSS_SHIFT, dirty,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528) locked, true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) for (i = 0; i < nr; i++, page++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532) int mapcount = page_mapcount(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) unsigned long pss = PAGE_SIZE << PSS_SHIFT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534) if (mapcount >= 2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535) pss /= mapcount;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536) smaps_page_accumulate(mss, page, PAGE_SIZE, pss, dirty, locked,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537) mapcount < 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541) #ifdef CONFIG_SHMEM
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542) static int smaps_pte_hole(unsigned long addr, unsigned long end,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543) __always_unused int depth, struct mm_walk *walk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545) struct mem_size_stats *mss = walk->private;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547) mss->swap += shmem_partial_swap_usage(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548) walk->vma->vm_file->f_mapping, addr, end);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553) #define smaps_pte_hole NULL
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554) #endif /* CONFIG_SHMEM */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556) static void smaps_pte_entry(pte_t *pte, unsigned long addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557) struct mm_walk *walk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 558) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 559) struct mem_size_stats *mss = walk->private;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 560) struct vm_area_struct *vma = walk->vma;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 561) bool locked = !!(vma->vm_flags & VM_LOCKED);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 562) struct page *page = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 563) bool migration = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 564)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 565) if (pte_present(*pte)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 566) page = vm_normal_page(vma, addr, *pte);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 567) } else if (is_swap_pte(*pte)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 568) swp_entry_t swpent = pte_to_swp_entry(*pte);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 569)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 570) if (!non_swap_entry(swpent)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 571) int mapcount;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 572)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 573) mss->swap += PAGE_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 574) mapcount = swp_swapcount(swpent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 575) if (mapcount >= 2) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 576) u64 pss_delta = (u64)PAGE_SIZE << PSS_SHIFT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 577)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 578) do_div(pss_delta, mapcount);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 579) mss->swap_pss += pss_delta;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 580) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 581) mss->swap_pss += (u64)PAGE_SIZE << PSS_SHIFT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 582) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 583) } else if (is_migration_entry(swpent)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 584) migration = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 585) page = migration_entry_to_page(swpent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 586) } else if (is_device_private_entry(swpent))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 587) page = device_private_entry_to_page(swpent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 588) } else if (unlikely(IS_ENABLED(CONFIG_SHMEM) && mss->check_shmem_swap
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 589) && pte_none(*pte))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 590) page = xa_load(&vma->vm_file->f_mapping->i_pages,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 591) linear_page_index(vma, addr));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 592) if (xa_is_value(page))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 593) mss->swap += PAGE_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 594) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 595) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 596)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 597) if (!page)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 598) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 599)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 600) smaps_account(mss, page, false, pte_young(*pte), pte_dirty(*pte),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 601) locked, migration);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 602) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 603)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 604) #ifdef CONFIG_TRANSPARENT_HUGEPAGE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 605) static void smaps_pmd_entry(pmd_t *pmd, unsigned long addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 606) struct mm_walk *walk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 607) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 608) struct mem_size_stats *mss = walk->private;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 609) struct vm_area_struct *vma = walk->vma;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 610) bool locked = !!(vma->vm_flags & VM_LOCKED);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 611) struct page *page = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 612) bool migration = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 613)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 614) if (pmd_present(*pmd)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 615) /* FOLL_DUMP will return -EFAULT on huge zero page */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 616) page = follow_trans_huge_pmd(vma, addr, pmd, FOLL_DUMP);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 617) } else if (unlikely(thp_migration_supported() && is_swap_pmd(*pmd))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 618) swp_entry_t entry = pmd_to_swp_entry(*pmd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 619)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 620) if (is_migration_entry(entry)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 621) migration = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 622) page = migration_entry_to_page(entry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 623) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 624) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 625) if (IS_ERR_OR_NULL(page))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 626) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 627) if (PageAnon(page))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 628) mss->anonymous_thp += HPAGE_PMD_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 629) else if (PageSwapBacked(page))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 630) mss->shmem_thp += HPAGE_PMD_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 631) else if (is_zone_device_page(page))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 632) /* pass */;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 633) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 634) mss->file_thp += HPAGE_PMD_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 635)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 636) smaps_account(mss, page, true, pmd_young(*pmd), pmd_dirty(*pmd),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 637) locked, migration);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 638) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 639) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 640) static void smaps_pmd_entry(pmd_t *pmd, unsigned long addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 641) struct mm_walk *walk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 642) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 643) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 644) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 645)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 646) static int smaps_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 647) struct mm_walk *walk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 648) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 649) struct vm_area_struct *vma = walk->vma;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 650) pte_t *pte;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 651) spinlock_t *ptl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 652)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 653) ptl = pmd_trans_huge_lock(pmd, vma);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 654) if (ptl) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 655) smaps_pmd_entry(pmd, addr, walk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 656) spin_unlock(ptl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 657) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 658) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 659)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 660) if (pmd_trans_unstable(pmd))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 661) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 662) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 663) * The mmap_lock held all the way back in m_start() is what
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 664) * keeps khugepaged out of here and from collapsing things
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 665) * in here.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 666) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 667) pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 668) for (; addr != end; pte++, addr += PAGE_SIZE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 669) smaps_pte_entry(pte, addr, walk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 670) pte_unmap_unlock(pte - 1, ptl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 671) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 672) cond_resched();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 673) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 674) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 675)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 676) static void show_smap_vma_flags(struct seq_file *m, struct vm_area_struct *vma)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 677) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 678) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 679) * Don't forget to update Documentation/ on changes.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 680) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 681) static const char mnemonics[BITS_PER_LONG][2] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 682) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 683) * In case if we meet a flag we don't know about.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 684) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 685) [0 ... (BITS_PER_LONG-1)] = "??",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 686)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 687) [ilog2(VM_READ)] = "rd",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 688) [ilog2(VM_WRITE)] = "wr",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 689) [ilog2(VM_EXEC)] = "ex",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 690) [ilog2(VM_SHARED)] = "sh",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 691) [ilog2(VM_MAYREAD)] = "mr",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 692) [ilog2(VM_MAYWRITE)] = "mw",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 693) [ilog2(VM_MAYEXEC)] = "me",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 694) [ilog2(VM_MAYSHARE)] = "ms",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 695) [ilog2(VM_GROWSDOWN)] = "gd",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 696) [ilog2(VM_PFNMAP)] = "pf",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 697) [ilog2(VM_DENYWRITE)] = "dw",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 698) [ilog2(VM_LOCKED)] = "lo",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 699) [ilog2(VM_IO)] = "io",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 700) [ilog2(VM_SEQ_READ)] = "sr",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 701) [ilog2(VM_RAND_READ)] = "rr",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 702) [ilog2(VM_DONTCOPY)] = "dc",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 703) [ilog2(VM_DONTEXPAND)] = "de",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 704) [ilog2(VM_ACCOUNT)] = "ac",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 705) [ilog2(VM_NORESERVE)] = "nr",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 706) [ilog2(VM_HUGETLB)] = "ht",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 707) [ilog2(VM_SYNC)] = "sf",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 708) [ilog2(VM_ARCH_1)] = "ar",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 709) [ilog2(VM_WIPEONFORK)] = "wf",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 710) [ilog2(VM_DONTDUMP)] = "dd",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 711) #ifdef CONFIG_ARM64_BTI
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 712) [ilog2(VM_ARM64_BTI)] = "bt",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 713) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 714) #ifdef CONFIG_MEM_SOFT_DIRTY
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 715) [ilog2(VM_SOFTDIRTY)] = "sd",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 716) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 717) [ilog2(VM_MIXEDMAP)] = "mm",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 718) [ilog2(VM_HUGEPAGE)] = "hg",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 719) [ilog2(VM_NOHUGEPAGE)] = "nh",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 720) [ilog2(VM_MERGEABLE)] = "mg",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 721) [ilog2(VM_UFFD_MISSING)]= "um",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 722) [ilog2(VM_UFFD_WP)] = "uw",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 723) #ifdef CONFIG_ARM64_MTE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 724) [ilog2(VM_MTE)] = "mt",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 725) [ilog2(VM_MTE_ALLOWED)] = "",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 726) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 727) #ifdef CONFIG_ARCH_HAS_PKEYS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 728) /* These come out via ProtectionKey: */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 729) [ilog2(VM_PKEY_BIT0)] = "",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 730) [ilog2(VM_PKEY_BIT1)] = "",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 731) [ilog2(VM_PKEY_BIT2)] = "",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 732) [ilog2(VM_PKEY_BIT3)] = "",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 733) #if VM_PKEY_BIT4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 734) [ilog2(VM_PKEY_BIT4)] = "",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 735) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 736) #endif /* CONFIG_ARCH_HAS_PKEYS */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 737) #ifdef CONFIG_HAVE_ARCH_USERFAULTFD_MINOR
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 738) [ilog2(VM_UFFD_MINOR)] = "ui",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 739) #endif /* CONFIG_HAVE_ARCH_USERFAULTFD_MINOR */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 740) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 741) size_t i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 742)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 743) seq_puts(m, "VmFlags: ");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 744) for (i = 0; i < BITS_PER_LONG; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 745) if (!mnemonics[i][0])
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 746) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 747) if (vma->vm_flags & (1UL << i)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 748) seq_putc(m, mnemonics[i][0]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 749) seq_putc(m, mnemonics[i][1]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 750) seq_putc(m, ' ');
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 751) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 752) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 753) seq_putc(m, '\n');
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 754) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 755)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 756) #ifdef CONFIG_HUGETLB_PAGE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 757) static int smaps_hugetlb_range(pte_t *pte, unsigned long hmask,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 758) unsigned long addr, unsigned long end,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 759) struct mm_walk *walk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 760) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 761) struct mem_size_stats *mss = walk->private;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 762) struct vm_area_struct *vma = walk->vma;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 763) struct page *page = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 764)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 765) if (pte_present(*pte)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 766) page = vm_normal_page(vma, addr, *pte);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 767) } else if (is_swap_pte(*pte)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 768) swp_entry_t swpent = pte_to_swp_entry(*pte);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 769)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 770) if (is_migration_entry(swpent))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 771) page = migration_entry_to_page(swpent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 772) else if (is_device_private_entry(swpent))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 773) page = device_private_entry_to_page(swpent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 774) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 775) if (page) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 776) int mapcount = page_mapcount(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 777)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 778) if (mapcount >= 2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 779) mss->shared_hugetlb += huge_page_size(hstate_vma(vma));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 780) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 781) mss->private_hugetlb += huge_page_size(hstate_vma(vma));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 782) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 783) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 784) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 785) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 786) #define smaps_hugetlb_range NULL
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 787) #endif /* HUGETLB_PAGE */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 788)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 789) static const struct mm_walk_ops smaps_walk_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 790) .pmd_entry = smaps_pte_range,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 791) .hugetlb_entry = smaps_hugetlb_range,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 792) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 793)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 794) static const struct mm_walk_ops smaps_shmem_walk_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 795) .pmd_entry = smaps_pte_range,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 796) .hugetlb_entry = smaps_hugetlb_range,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 797) .pte_hole = smaps_pte_hole,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 798) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 799)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 800) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 801) * Gather mem stats from @vma with the indicated beginning
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 802) * address @start, and keep them in @mss.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 803) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 804) * Use vm_start of @vma as the beginning address if @start is 0.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 805) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 806) static void smap_gather_stats(struct vm_area_struct *vma,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 807) struct mem_size_stats *mss, unsigned long start)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 808) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 809) const struct mm_walk_ops *ops = &smaps_walk_ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 810)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 811) /* Invalid start */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 812) if (start >= vma->vm_end)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 813) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 814)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 815) #ifdef CONFIG_SHMEM
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 816) /* In case of smaps_rollup, reset the value from previous vma */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 817) mss->check_shmem_swap = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 818) if (vma->vm_file && shmem_mapping(vma->vm_file->f_mapping)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 819) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 820) * For shared or readonly shmem mappings we know that all
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 821) * swapped out pages belong to the shmem object, and we can
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 822) * obtain the swap value much more efficiently. For private
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 823) * writable mappings, we might have COW pages that are
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 824) * not affected by the parent swapped out pages of the shmem
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 825) * object, so we have to distinguish them during the page walk.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 826) * Unless we know that the shmem object (or the part mapped by
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 827) * our VMA) has no swapped out pages at all.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 828) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 829) unsigned long shmem_swapped = shmem_swap_usage(vma);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 830)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 831) if (!start && (!shmem_swapped || (vma->vm_flags & VM_SHARED) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 832) !(vma->vm_flags & VM_WRITE))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 833) mss->swap += shmem_swapped;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 834) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 835) mss->check_shmem_swap = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 836) ops = &smaps_shmem_walk_ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 837) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 838) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 839) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 840) /* mmap_lock is held in m_start */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 841) if (!start)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 842) walk_page_vma(vma, ops, mss);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 843) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 844) walk_page_range(vma->vm_mm, start, vma->vm_end, ops, mss);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 845) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 846)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 847) #define SEQ_PUT_DEC(str, val) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 848) seq_put_decimal_ull_width(m, str, (val) >> 10, 8)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 849)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 850) /* Show the contents common for smaps and smaps_rollup */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 851) static void __show_smap(struct seq_file *m, const struct mem_size_stats *mss,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 852) bool rollup_mode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 853) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 854) SEQ_PUT_DEC("Rss: ", mss->resident);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 855) SEQ_PUT_DEC(" kB\nPss: ", mss->pss >> PSS_SHIFT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 856) if (rollup_mode) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 857) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 858) * These are meaningful only for smaps_rollup, otherwise two of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 859) * them are zero, and the other one is the same as Pss.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 860) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 861) SEQ_PUT_DEC(" kB\nPss_Anon: ",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 862) mss->pss_anon >> PSS_SHIFT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 863) SEQ_PUT_DEC(" kB\nPss_File: ",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 864) mss->pss_file >> PSS_SHIFT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 865) SEQ_PUT_DEC(" kB\nPss_Shmem: ",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 866) mss->pss_shmem >> PSS_SHIFT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 867) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 868) SEQ_PUT_DEC(" kB\nShared_Clean: ", mss->shared_clean);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 869) SEQ_PUT_DEC(" kB\nShared_Dirty: ", mss->shared_dirty);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 870) SEQ_PUT_DEC(" kB\nPrivate_Clean: ", mss->private_clean);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 871) SEQ_PUT_DEC(" kB\nPrivate_Dirty: ", mss->private_dirty);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 872) SEQ_PUT_DEC(" kB\nReferenced: ", mss->referenced);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 873) SEQ_PUT_DEC(" kB\nAnonymous: ", mss->anonymous);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 874) SEQ_PUT_DEC(" kB\nLazyFree: ", mss->lazyfree);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 875) SEQ_PUT_DEC(" kB\nAnonHugePages: ", mss->anonymous_thp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 876) SEQ_PUT_DEC(" kB\nShmemPmdMapped: ", mss->shmem_thp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 877) SEQ_PUT_DEC(" kB\nFilePmdMapped: ", mss->file_thp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 878) SEQ_PUT_DEC(" kB\nShared_Hugetlb: ", mss->shared_hugetlb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 879) seq_put_decimal_ull_width(m, " kB\nPrivate_Hugetlb: ",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 880) mss->private_hugetlb >> 10, 7);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 881) SEQ_PUT_DEC(" kB\nSwap: ", mss->swap);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 882) SEQ_PUT_DEC(" kB\nSwapPss: ",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 883) mss->swap_pss >> PSS_SHIFT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 884) SEQ_PUT_DEC(" kB\nLocked: ",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 885) mss->pss_locked >> PSS_SHIFT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 886) seq_puts(m, " kB\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 887) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 888)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 889) static int show_smap(struct seq_file *m, void *v)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 890) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 891) struct vm_area_struct *vma = v;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 892) struct mem_size_stats mss;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 893)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 894) memset(&mss, 0, sizeof(mss));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 895)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 896) smap_gather_stats(vma, &mss, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 897)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 898) show_map_vma(m, vma);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 899) if (vma_get_anon_name(vma)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 900) seq_puts(m, "Name: ");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 901) seq_print_vma_name(m, vma);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 902) seq_putc(m, '\n');
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 903) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 904)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 905) SEQ_PUT_DEC("Size: ", vma->vm_end - vma->vm_start);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 906) SEQ_PUT_DEC(" kB\nKernelPageSize: ", vma_kernel_pagesize(vma));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 907) SEQ_PUT_DEC(" kB\nMMUPageSize: ", vma_mmu_pagesize(vma));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 908) seq_puts(m, " kB\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 909)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 910) __show_smap(m, &mss, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 911)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 912) seq_printf(m, "THPeligible: %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 913) transparent_hugepage_active(vma));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 914)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 915) if (arch_pkeys_enabled())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 916) seq_printf(m, "ProtectionKey: %8u\n", vma_pkey(vma));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 917) show_smap_vma_flags(m, vma);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 918)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 919) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 920) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 921)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 922) static int show_smaps_rollup(struct seq_file *m, void *v)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 923) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 924) struct proc_maps_private *priv = m->private;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 925) struct mem_size_stats mss;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 926) struct mm_struct *mm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 927) struct vm_area_struct *vma;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 928) unsigned long last_vma_end = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 929) int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 930)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 931) priv->task = get_proc_task(priv->inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 932) if (!priv->task)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 933) return -ESRCH;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 934)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 935) mm = priv->mm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 936) if (!mm || !mmget_not_zero(mm)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 937) ret = -ESRCH;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 938) goto out_put_task;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 939) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 940)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 941) memset(&mss, 0, sizeof(mss));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 942)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 943) ret = mmap_read_lock_killable(mm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 944) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 945) goto out_put_mm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 946)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 947) hold_task_mempolicy(priv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 948)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 949) for (vma = priv->mm->mmap; vma;) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 950) smap_gather_stats(vma, &mss, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 951) last_vma_end = vma->vm_end;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 952)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 953) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 954) * Release mmap_lock temporarily if someone wants to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 955) * access it for write request.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 956) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 957) if (mmap_lock_is_contended(mm)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 958) mmap_read_unlock(mm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 959) ret = mmap_read_lock_killable(mm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 960) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 961) release_task_mempolicy(priv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 962) goto out_put_mm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 963) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 964)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 965) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 966) * After dropping the lock, there are four cases to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 967) * consider. See the following example for explanation.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 968) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 969) * +------+------+-----------+
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 970) * | VMA1 | VMA2 | VMA3 |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 971) * +------+------+-----------+
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 972) * | | | |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 973) * 4k 8k 16k 400k
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 974) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 975) * Suppose we drop the lock after reading VMA2 due to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 976) * contention, then we get:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 977) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 978) * last_vma_end = 16k
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 979) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 980) * 1) VMA2 is freed, but VMA3 exists:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 981) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 982) * find_vma(mm, 16k - 1) will return VMA3.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 983) * In this case, just continue from VMA3.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 984) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 985) * 2) VMA2 still exists:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 986) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 987) * find_vma(mm, 16k - 1) will return VMA2.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 988) * Iterate the loop like the original one.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 989) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 990) * 3) No more VMAs can be found:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 991) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 992) * find_vma(mm, 16k - 1) will return NULL.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 993) * No more things to do, just break.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 994) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 995) * 4) (last_vma_end - 1) is the middle of a vma (VMA'):
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 996) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 997) * find_vma(mm, 16k - 1) will return VMA' whose range
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 998) * contains last_vma_end.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 999) * Iterate VMA' from last_vma_end.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1000) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1001) vma = find_vma(mm, last_vma_end - 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1002) /* Case 3 above */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1003) if (!vma)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1004) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1005)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1006) /* Case 1 above */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1007) if (vma->vm_start >= last_vma_end)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1008) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1009)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1010) /* Case 4 above */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1011) if (vma->vm_end > last_vma_end)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1012) smap_gather_stats(vma, &mss, last_vma_end);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1013) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1014) /* Case 2 above */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1015) vma = vma->vm_next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1016) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1017)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1018) show_vma_header_prefix(m, priv->mm->mmap->vm_start,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1019) last_vma_end, 0, 0, 0, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1020) seq_pad(m, ' ');
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1021) seq_puts(m, "[rollup]\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1022)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1023) __show_smap(m, &mss, true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1024)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1025) release_task_mempolicy(priv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1026) mmap_read_unlock(mm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1027)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1028) out_put_mm:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1029) mmput(mm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1030) out_put_task:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1031) put_task_struct(priv->task);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1032) priv->task = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1033)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1034) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1035) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1036) #undef SEQ_PUT_DEC
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1037)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1038) static const struct seq_operations proc_pid_smaps_op = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1039) .start = m_start,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1040) .next = m_next,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1041) .stop = m_stop,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1042) .show = show_smap
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1043) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1044)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1045) static int pid_smaps_open(struct inode *inode, struct file *file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1046) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1047) return do_maps_open(inode, file, &proc_pid_smaps_op);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1048) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1049)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1050) static int smaps_rollup_open(struct inode *inode, struct file *file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1051) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1052) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1053) struct proc_maps_private *priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1054)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1055) priv = kzalloc(sizeof(*priv), GFP_KERNEL_ACCOUNT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1056) if (!priv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1057) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1058)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1059) ret = single_open(file, show_smaps_rollup, priv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1060) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1061) goto out_free;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1062)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1063) priv->inode = inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1064) priv->mm = proc_mem_open(inode, PTRACE_MODE_READ);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1065) if (IS_ERR(priv->mm)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1066) ret = PTR_ERR(priv->mm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1067)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1068) single_release(inode, file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1069) goto out_free;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1070) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1071)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1072) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1073)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1074) out_free:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1075) kfree(priv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1076) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1077) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1078)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1079) static int smaps_rollup_release(struct inode *inode, struct file *file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1080) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1081) struct seq_file *seq = file->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1082) struct proc_maps_private *priv = seq->private;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1083)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1084) if (priv->mm)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1085) mmdrop(priv->mm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1086)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1087) kfree(priv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1088) return single_release(inode, file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1089) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1090)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1091) const struct file_operations proc_pid_smaps_operations = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1092) .open = pid_smaps_open,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1093) .read = seq_read,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1094) .llseek = seq_lseek,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1095) .release = proc_map_release,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1096) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1097)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1098) const struct file_operations proc_pid_smaps_rollup_operations = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1099) .open = smaps_rollup_open,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1100) .read = seq_read,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1101) .llseek = seq_lseek,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1102) .release = smaps_rollup_release,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1103) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1104)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1105) enum clear_refs_types {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1106) CLEAR_REFS_ALL = 1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1107) CLEAR_REFS_ANON,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1108) CLEAR_REFS_MAPPED,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1109) CLEAR_REFS_SOFT_DIRTY,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1110) CLEAR_REFS_MM_HIWATER_RSS,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1111) CLEAR_REFS_LAST,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1112) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1113)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1114) struct clear_refs_private {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1115) enum clear_refs_types type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1116) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1117)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1118) #ifdef CONFIG_MEM_SOFT_DIRTY
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1119)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1120) #define is_cow_mapping(flags) (((flags) & (VM_SHARED | VM_MAYWRITE)) == VM_MAYWRITE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1121)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1122) static inline bool pte_is_pinned(struct vm_area_struct *vma, unsigned long addr, pte_t pte)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1123) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1124) struct page *page;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1125)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1126) if (!pte_write(pte))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1127) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1128) if (!is_cow_mapping(vma->vm_flags))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1129) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1130) if (likely(!atomic_read(&vma->vm_mm->has_pinned)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1131) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1132) page = vm_normal_page(vma, addr, pte);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1133) if (!page)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1134) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1135) return page_maybe_dma_pinned(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1136) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1137)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1138) static inline void clear_soft_dirty(struct vm_area_struct *vma,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1139) unsigned long addr, pte_t *pte)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1140) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1141) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1142) * The soft-dirty tracker uses #PF-s to catch writes
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1143) * to pages, so write-protect the pte as well. See the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1144) * Documentation/admin-guide/mm/soft-dirty.rst for full description
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1145) * of how soft-dirty works.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1146) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1147) pte_t ptent = *pte;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1148)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1149) if (pte_present(ptent)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1150) pte_t old_pte;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1151)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1152) if (pte_is_pinned(vma, addr, ptent))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1153) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1154) old_pte = ptep_modify_prot_start(vma, addr, pte);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1155) ptent = pte_wrprotect(old_pte);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1156) ptent = pte_clear_soft_dirty(ptent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1157) ptep_modify_prot_commit(vma, addr, pte, old_pte, ptent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1158) } else if (is_swap_pte(ptent)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1159) ptent = pte_swp_clear_soft_dirty(ptent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1160) set_pte_at(vma->vm_mm, addr, pte, ptent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1161) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1162) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1163) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1164) static inline void clear_soft_dirty(struct vm_area_struct *vma,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1165) unsigned long addr, pte_t *pte)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1166) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1167) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1168) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1169)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1170) #if defined(CONFIG_MEM_SOFT_DIRTY) && defined(CONFIG_TRANSPARENT_HUGEPAGE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1171) static inline void clear_soft_dirty_pmd(struct vm_area_struct *vma,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1172) unsigned long addr, pmd_t *pmdp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1173) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1174) pmd_t old, pmd = *pmdp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1175)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1176) if (pmd_present(pmd)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1177) /* See comment in change_huge_pmd() */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1178) old = pmdp_invalidate(vma, addr, pmdp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1179) if (pmd_dirty(old))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1180) pmd = pmd_mkdirty(pmd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1181) if (pmd_young(old))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1182) pmd = pmd_mkyoung(pmd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1183)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1184) pmd = pmd_wrprotect(pmd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1185) pmd = pmd_clear_soft_dirty(pmd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1186)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1187) set_pmd_at(vma->vm_mm, addr, pmdp, pmd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1188) } else if (is_migration_entry(pmd_to_swp_entry(pmd))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1189) pmd = pmd_swp_clear_soft_dirty(pmd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1190) set_pmd_at(vma->vm_mm, addr, pmdp, pmd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1191) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1192) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1193) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1194) static inline void clear_soft_dirty_pmd(struct vm_area_struct *vma,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1195) unsigned long addr, pmd_t *pmdp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1196) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1197) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1198) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1199)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1200) static int clear_refs_pte_range(pmd_t *pmd, unsigned long addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1201) unsigned long end, struct mm_walk *walk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1202) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1203) struct clear_refs_private *cp = walk->private;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1204) struct vm_area_struct *vma = walk->vma;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1205) pte_t *pte, ptent;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1206) spinlock_t *ptl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1207) struct page *page;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1208)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1209) ptl = pmd_trans_huge_lock(pmd, vma);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1210) if (ptl) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1211) if (cp->type == CLEAR_REFS_SOFT_DIRTY) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1212) clear_soft_dirty_pmd(vma, addr, pmd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1213) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1214) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1215)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1216) if (!pmd_present(*pmd))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1217) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1218)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1219) page = pmd_page(*pmd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1220)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1221) /* Clear accessed and referenced bits. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1222) pmdp_test_and_clear_young(vma, addr, pmd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1223) test_and_clear_page_young(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1224) ClearPageReferenced(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1225) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1226) spin_unlock(ptl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1227) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1228) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1229)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1230) if (pmd_trans_unstable(pmd))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1231) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1232)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1233) pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1234) for (; addr != end; pte++, addr += PAGE_SIZE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1235) ptent = *pte;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1236)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1237) if (cp->type == CLEAR_REFS_SOFT_DIRTY) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1238) clear_soft_dirty(vma, addr, pte);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1239) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1240) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1241)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1242) if (!pte_present(ptent))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1243) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1244)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1245) page = vm_normal_page(vma, addr, ptent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1246) if (!page)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1247) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1248)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1249) /* Clear accessed and referenced bits. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1250) ptep_test_and_clear_young(vma, addr, pte);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1251) test_and_clear_page_young(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1252) ClearPageReferenced(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1253) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1254) pte_unmap_unlock(pte - 1, ptl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1255) cond_resched();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1256) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1257) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1258)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1259) static int clear_refs_test_walk(unsigned long start, unsigned long end,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1260) struct mm_walk *walk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1261) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1262) struct clear_refs_private *cp = walk->private;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1263) struct vm_area_struct *vma = walk->vma;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1264)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1265) if (vma->vm_flags & VM_PFNMAP)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1266) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1267)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1268) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1269) * Writing 1 to /proc/pid/clear_refs affects all pages.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1270) * Writing 2 to /proc/pid/clear_refs only affects anonymous pages.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1271) * Writing 3 to /proc/pid/clear_refs only affects file mapped pages.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1272) * Writing 4 to /proc/pid/clear_refs affects all pages.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1273) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1274) if (cp->type == CLEAR_REFS_ANON && vma->vm_file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1275) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1276) if (cp->type == CLEAR_REFS_MAPPED && !vma->vm_file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1277) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1278) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1279) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1280)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1281) static const struct mm_walk_ops clear_refs_walk_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1282) .pmd_entry = clear_refs_pte_range,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1283) .test_walk = clear_refs_test_walk,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1284) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1285)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1286) static ssize_t clear_refs_write(struct file *file, const char __user *buf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1287) size_t count, loff_t *ppos)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1288) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1289) struct task_struct *task;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1290) char buffer[PROC_NUMBUF];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1291) struct mm_struct *mm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1292) struct vm_area_struct *vma;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1293) enum clear_refs_types type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1294) int itype;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1295) int rv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1296)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1297) memset(buffer, 0, sizeof(buffer));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1298) if (count > sizeof(buffer) - 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1299) count = sizeof(buffer) - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1300) if (copy_from_user(buffer, buf, count))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1301) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1302) rv = kstrtoint(strstrip(buffer), 10, &itype);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1303) if (rv < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1304) return rv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1305) type = (enum clear_refs_types)itype;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1306) if (type < CLEAR_REFS_ALL || type >= CLEAR_REFS_LAST)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1307) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1308)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1309) task = get_proc_task(file_inode(file));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1310) if (!task)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1311) return -ESRCH;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1312) mm = get_task_mm(task);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1313) if (mm) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1314) struct mmu_notifier_range range;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1315) struct clear_refs_private cp = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1316) .type = type,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1317) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1318)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1319) if (mmap_write_lock_killable(mm)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1320) count = -EINTR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1321) goto out_mm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1322) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1323) if (type == CLEAR_REFS_MM_HIWATER_RSS) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1324) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1325) * Writing 5 to /proc/pid/clear_refs resets the peak
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1326) * resident set size to this mm's current rss value.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1327) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1328) reset_mm_hiwater_rss(mm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1329) goto out_unlock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1330) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1331)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1332) if (type == CLEAR_REFS_SOFT_DIRTY) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1333) for (vma = mm->mmap; vma; vma = vma->vm_next) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1334) if (!(vma->vm_flags & VM_SOFTDIRTY))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1335) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1336) vm_write_begin(vma);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1337) WRITE_ONCE(vma->vm_flags,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1338) vma->vm_flags & ~VM_SOFTDIRTY);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1339) vma_set_page_prot(vma);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1340) vm_write_end(vma);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1341) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1342)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1343) inc_tlb_flush_pending(mm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1344) mmu_notifier_range_init(&range, MMU_NOTIFY_SOFT_DIRTY,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1345) 0, NULL, mm, 0, -1UL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1346) mmu_notifier_invalidate_range_start(&range);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1347) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1348) walk_page_range(mm, 0, mm->highest_vm_end, &clear_refs_walk_ops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1349) &cp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1350) if (type == CLEAR_REFS_SOFT_DIRTY) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1351) mmu_notifier_invalidate_range_end(&range);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1352) flush_tlb_mm(mm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1353) dec_tlb_flush_pending(mm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1354) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1355) out_unlock:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1356) mmap_write_unlock(mm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1357) out_mm:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1358) mmput(mm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1359) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1360) put_task_struct(task);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1361)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1362) return count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1363) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1364)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1365) const struct file_operations proc_clear_refs_operations = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1366) .write = clear_refs_write,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1367) .llseek = noop_llseek,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1368) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1369)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1370) typedef struct {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1371) u64 pme;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1372) } pagemap_entry_t;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1373)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1374) struct pagemapread {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1375) int pos, len; /* units: PM_ENTRY_BYTES, not bytes */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1376) pagemap_entry_t *buffer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1377) bool show_pfn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1378) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1379)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1380) #define PAGEMAP_WALK_SIZE (PMD_SIZE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1381) #define PAGEMAP_WALK_MASK (PMD_MASK)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1382)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1383) #define PM_ENTRY_BYTES sizeof(pagemap_entry_t)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1384) #define PM_PFRAME_BITS 55
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1385) #define PM_PFRAME_MASK GENMASK_ULL(PM_PFRAME_BITS - 1, 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1386) #define PM_SOFT_DIRTY BIT_ULL(55)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1387) #define PM_MMAP_EXCLUSIVE BIT_ULL(56)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1388) #define PM_FILE BIT_ULL(61)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1389) #define PM_SWAP BIT_ULL(62)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1390) #define PM_PRESENT BIT_ULL(63)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1391)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1392) #define PM_END_OF_BUFFER 1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1393)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1394) static inline pagemap_entry_t make_pme(u64 frame, u64 flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1395) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1396) return (pagemap_entry_t) { .pme = (frame & PM_PFRAME_MASK) | flags };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1397) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1398)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1399) static int add_to_pagemap(unsigned long addr, pagemap_entry_t *pme,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1400) struct pagemapread *pm)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1401) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1402) pm->buffer[pm->pos++] = *pme;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1403) if (pm->pos >= pm->len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1404) return PM_END_OF_BUFFER;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1405) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1406) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1407)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1408) static int pagemap_pte_hole(unsigned long start, unsigned long end,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1409) __always_unused int depth, struct mm_walk *walk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1410) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1411) struct pagemapread *pm = walk->private;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1412) unsigned long addr = start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1413) int err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1414)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1415) while (addr < end) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1416) struct vm_area_struct *vma = find_vma(walk->mm, addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1417) pagemap_entry_t pme = make_pme(0, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1418) /* End of address space hole, which we mark as non-present. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1419) unsigned long hole_end;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1420)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1421) if (vma)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1422) hole_end = min(end, vma->vm_start);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1423) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1424) hole_end = end;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1425)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1426) for (; addr < hole_end; addr += PAGE_SIZE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1427) err = add_to_pagemap(addr, &pme, pm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1428) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1429) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1430) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1431)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1432) if (!vma)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1433) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1434)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1435) /* Addresses in the VMA. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1436) if (vma->vm_flags & VM_SOFTDIRTY)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1437) pme = make_pme(0, PM_SOFT_DIRTY);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1438) for (; addr < min(end, vma->vm_end); addr += PAGE_SIZE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1439) err = add_to_pagemap(addr, &pme, pm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1440) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1441) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1442) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1443) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1444) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1445) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1446) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1447)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1448) static pagemap_entry_t pte_to_pagemap_entry(struct pagemapread *pm,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1449) struct vm_area_struct *vma, unsigned long addr, pte_t pte)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1450) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1451) u64 frame = 0, flags = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1452) struct page *page = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1453) bool migration = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1454)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1455) if (pte_present(pte)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1456) if (pm->show_pfn)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1457) frame = pte_pfn(pte);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1458) flags |= PM_PRESENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1459) page = vm_normal_page(vma, addr, pte);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1460) if (pte_soft_dirty(pte))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1461) flags |= PM_SOFT_DIRTY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1462) } else if (is_swap_pte(pte)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1463) swp_entry_t entry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1464) if (pte_swp_soft_dirty(pte))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1465) flags |= PM_SOFT_DIRTY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1466) entry = pte_to_swp_entry(pte);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1467) if (pm->show_pfn)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1468) frame = swp_type(entry) |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1469) (swp_offset(entry) << MAX_SWAPFILES_SHIFT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1470) flags |= PM_SWAP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1471) if (is_migration_entry(entry)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1472) migration = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1473) page = migration_entry_to_page(entry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1474) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1475)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1476) if (is_device_private_entry(entry))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1477) page = device_private_entry_to_page(entry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1478) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1479)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1480) if (page && !PageAnon(page))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1481) flags |= PM_FILE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1482) if (page && !migration && page_mapcount(page) == 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1483) flags |= PM_MMAP_EXCLUSIVE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1484) if (vma->vm_flags & VM_SOFTDIRTY)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1485) flags |= PM_SOFT_DIRTY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1486)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1487) return make_pme(frame, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1488) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1489)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1490) static int pagemap_pmd_range(pmd_t *pmdp, unsigned long addr, unsigned long end,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1491) struct mm_walk *walk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1492) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1493) struct vm_area_struct *vma = walk->vma;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1494) struct pagemapread *pm = walk->private;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1495) spinlock_t *ptl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1496) pte_t *pte, *orig_pte;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1497) int err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1498) #ifdef CONFIG_TRANSPARENT_HUGEPAGE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1499) bool migration = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1500)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1501) ptl = pmd_trans_huge_lock(pmdp, vma);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1502) if (ptl) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1503) u64 flags = 0, frame = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1504) pmd_t pmd = *pmdp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1505) struct page *page = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1506)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1507) if (vma->vm_flags & VM_SOFTDIRTY)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1508) flags |= PM_SOFT_DIRTY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1509)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1510) if (pmd_present(pmd)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1511) page = pmd_page(pmd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1512)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1513) flags |= PM_PRESENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1514) if (pmd_soft_dirty(pmd))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1515) flags |= PM_SOFT_DIRTY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1516) if (pm->show_pfn)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1517) frame = pmd_pfn(pmd) +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1518) ((addr & ~PMD_MASK) >> PAGE_SHIFT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1519) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1520) #ifdef CONFIG_ARCH_ENABLE_THP_MIGRATION
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1521) else if (is_swap_pmd(pmd)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1522) swp_entry_t entry = pmd_to_swp_entry(pmd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1523) unsigned long offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1524)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1525) if (pm->show_pfn) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1526) offset = swp_offset(entry) +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1527) ((addr & ~PMD_MASK) >> PAGE_SHIFT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1528) frame = swp_type(entry) |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1529) (offset << MAX_SWAPFILES_SHIFT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1530) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1531) flags |= PM_SWAP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1532) if (pmd_swp_soft_dirty(pmd))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1533) flags |= PM_SOFT_DIRTY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1534) VM_BUG_ON(!is_pmd_migration_entry(pmd));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1535) migration = is_migration_entry(entry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1536) page = migration_entry_to_page(entry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1537) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1538) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1539)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1540) if (page && !migration && page_mapcount(page) == 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1541) flags |= PM_MMAP_EXCLUSIVE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1542)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1543) for (; addr != end; addr += PAGE_SIZE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1544) pagemap_entry_t pme = make_pme(frame, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1545)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1546) err = add_to_pagemap(addr, &pme, pm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1547) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1548) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1549) if (pm->show_pfn) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1550) if (flags & PM_PRESENT)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1551) frame++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1552) else if (flags & PM_SWAP)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1553) frame += (1 << MAX_SWAPFILES_SHIFT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1554) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1555) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1556) spin_unlock(ptl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1557) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1558) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1559)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1560) if (pmd_trans_unstable(pmdp))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1561) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1562) #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1563)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1564) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1565) * We can assume that @vma always points to a valid one and @end never
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1566) * goes beyond vma->vm_end.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1567) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1568) orig_pte = pte = pte_offset_map_lock(walk->mm, pmdp, addr, &ptl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1569) for (; addr < end; pte++, addr += PAGE_SIZE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1570) pagemap_entry_t pme;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1571)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1572) pme = pte_to_pagemap_entry(pm, vma, addr, *pte);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1573) err = add_to_pagemap(addr, &pme, pm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1574) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1575) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1576) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1577) pte_unmap_unlock(orig_pte, ptl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1578)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1579) cond_resched();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1580)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1581) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1582) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1583)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1584) #ifdef CONFIG_HUGETLB_PAGE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1585) /* This function walks within one hugetlb entry in the single call */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1586) static int pagemap_hugetlb_range(pte_t *ptep, unsigned long hmask,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1587) unsigned long addr, unsigned long end,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1588) struct mm_walk *walk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1589) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1590) struct pagemapread *pm = walk->private;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1591) struct vm_area_struct *vma = walk->vma;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1592) u64 flags = 0, frame = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1593) int err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1594) pte_t pte;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1595)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1596) if (vma->vm_flags & VM_SOFTDIRTY)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1597) flags |= PM_SOFT_DIRTY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1598)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1599) pte = huge_ptep_get(ptep);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1600) if (pte_present(pte)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1601) struct page *page = pte_page(pte);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1602)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1603) if (!PageAnon(page))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1604) flags |= PM_FILE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1605)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1606) if (page_mapcount(page) == 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1607) flags |= PM_MMAP_EXCLUSIVE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1608)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1609) flags |= PM_PRESENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1610) if (pm->show_pfn)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1611) frame = pte_pfn(pte) +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1612) ((addr & ~hmask) >> PAGE_SHIFT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1613) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1614)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1615) for (; addr != end; addr += PAGE_SIZE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1616) pagemap_entry_t pme = make_pme(frame, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1617)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1618) err = add_to_pagemap(addr, &pme, pm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1619) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1620) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1621) if (pm->show_pfn && (flags & PM_PRESENT))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1622) frame++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1623) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1624)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1625) cond_resched();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1626)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1627) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1628) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1629) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1630) #define pagemap_hugetlb_range NULL
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1631) #endif /* HUGETLB_PAGE */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1632)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1633) static const struct mm_walk_ops pagemap_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1634) .pmd_entry = pagemap_pmd_range,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1635) .pte_hole = pagemap_pte_hole,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1636) .hugetlb_entry = pagemap_hugetlb_range,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1637) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1638)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1639) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1640) * /proc/pid/pagemap - an array mapping virtual pages to pfns
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1641) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1642) * For each page in the address space, this file contains one 64-bit entry
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1643) * consisting of the following:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1644) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1645) * Bits 0-54 page frame number (PFN) if present
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1646) * Bits 0-4 swap type if swapped
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1647) * Bits 5-54 swap offset if swapped
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1648) * Bit 55 pte is soft-dirty (see Documentation/admin-guide/mm/soft-dirty.rst)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1649) * Bit 56 page exclusively mapped
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1650) * Bits 57-60 zero
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1651) * Bit 61 page is file-page or shared-anon
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1652) * Bit 62 page swapped
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1653) * Bit 63 page present
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1654) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1655) * If the page is not present but in swap, then the PFN contains an
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1656) * encoding of the swap file number and the page's offset into the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1657) * swap. Unmapped pages return a null PFN. This allows determining
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1658) * precisely which pages are mapped (or in swap) and comparing mapped
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1659) * pages between processes.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1660) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1661) * Efficient users of this interface will use /proc/pid/maps to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1662) * determine which areas of memory are actually mapped and llseek to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1663) * skip over unmapped regions.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1664) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1665) static ssize_t pagemap_read(struct file *file, char __user *buf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1666) size_t count, loff_t *ppos)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1667) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1668) struct mm_struct *mm = file->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1669) struct pagemapread pm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1670) unsigned long src;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1671) unsigned long svpfn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1672) unsigned long start_vaddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1673) unsigned long end_vaddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1674) int ret = 0, copied = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1675)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1676) if (!mm || !mmget_not_zero(mm))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1677) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1678)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1679) ret = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1680) /* file position must be aligned */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1681) if ((*ppos % PM_ENTRY_BYTES) || (count % PM_ENTRY_BYTES))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1682) goto out_mm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1683)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1684) ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1685) if (!count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1686) goto out_mm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1687)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1688) /* do not disclose physical addresses: attack vector */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1689) pm.show_pfn = file_ns_capable(file, &init_user_ns, CAP_SYS_ADMIN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1690)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1691) pm.len = (PAGEMAP_WALK_SIZE >> PAGE_SHIFT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1692) pm.buffer = kmalloc_array(pm.len, PM_ENTRY_BYTES, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1693) ret = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1694) if (!pm.buffer)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1695) goto out_mm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1696)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1697) src = *ppos;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1698) svpfn = src / PM_ENTRY_BYTES;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1699) end_vaddr = mm->task_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1700)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1701) /* watch out for wraparound */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1702) start_vaddr = end_vaddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1703) if (svpfn <= (ULONG_MAX >> PAGE_SHIFT))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1704) start_vaddr = untagged_addr(svpfn << PAGE_SHIFT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1705)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1706) /* Ensure the address is inside the task */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1707) if (start_vaddr > mm->task_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1708) start_vaddr = end_vaddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1709)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1710) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1711) * The odds are that this will stop walking way
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1712) * before end_vaddr, because the length of the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1713) * user buffer is tracked in "pm", and the walk
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1714) * will stop when we hit the end of the buffer.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1715) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1716) ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1717) while (count && (start_vaddr < end_vaddr)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1718) int len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1719) unsigned long end;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1720)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1721) pm.pos = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1722) end = (start_vaddr + PAGEMAP_WALK_SIZE) & PAGEMAP_WALK_MASK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1723) /* overflow ? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1724) if (end < start_vaddr || end > end_vaddr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1725) end = end_vaddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1726) ret = mmap_read_lock_killable(mm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1727) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1728) goto out_free;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1729) ret = walk_page_range(mm, start_vaddr, end, &pagemap_ops, &pm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1730) mmap_read_unlock(mm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1731) start_vaddr = end;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1732)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1733) len = min(count, PM_ENTRY_BYTES * pm.pos);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1734) if (copy_to_user(buf, pm.buffer, len)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1735) ret = -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1736) goto out_free;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1737) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1738) copied += len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1739) buf += len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1740) count -= len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1741) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1742) *ppos += copied;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1743) if (!ret || ret == PM_END_OF_BUFFER)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1744) ret = copied;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1745)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1746) out_free:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1747) kfree(pm.buffer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1748) out_mm:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1749) mmput(mm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1750) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1751) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1752) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1753)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1754) static int pagemap_open(struct inode *inode, struct file *file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1755) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1756) struct mm_struct *mm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1757)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1758) mm = proc_mem_open(inode, PTRACE_MODE_READ);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1759) if (IS_ERR(mm))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1760) return PTR_ERR(mm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1761) file->private_data = mm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1762) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1763) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1764)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1765) static int pagemap_release(struct inode *inode, struct file *file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1766) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1767) struct mm_struct *mm = file->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1768)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1769) if (mm)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1770) mmdrop(mm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1771) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1772) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1773)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1774) const struct file_operations proc_pagemap_operations = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1775) .llseek = mem_lseek, /* borrow this */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1776) .read = pagemap_read,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1777) .open = pagemap_open,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1778) .release = pagemap_release,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1779) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1780) #endif /* CONFIG_PROC_PAGE_MONITOR */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1781)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1782) #ifdef CONFIG_NUMA
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1783)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1784) struct numa_maps {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1785) unsigned long pages;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1786) unsigned long anon;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1787) unsigned long active;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1788) unsigned long writeback;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1789) unsigned long mapcount_max;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1790) unsigned long dirty;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1791) unsigned long swapcache;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1792) unsigned long node[MAX_NUMNODES];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1793) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1794)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1795) struct numa_maps_private {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1796) struct proc_maps_private proc_maps;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1797) struct numa_maps md;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1798) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1799)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1800) static void gather_stats(struct page *page, struct numa_maps *md, int pte_dirty,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1801) unsigned long nr_pages)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1802) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1803) int count = page_mapcount(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1804)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1805) md->pages += nr_pages;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1806) if (pte_dirty || PageDirty(page))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1807) md->dirty += nr_pages;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1808)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1809) if (PageSwapCache(page))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1810) md->swapcache += nr_pages;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1811)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1812) if (PageActive(page) || PageUnevictable(page))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1813) md->active += nr_pages;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1814)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1815) if (PageWriteback(page))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1816) md->writeback += nr_pages;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1817)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1818) if (PageAnon(page))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1819) md->anon += nr_pages;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1820)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1821) if (count > md->mapcount_max)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1822) md->mapcount_max = count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1823)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1824) md->node[page_to_nid(page)] += nr_pages;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1825) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1826)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1827) static struct page *can_gather_numa_stats(pte_t pte, struct vm_area_struct *vma,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1828) unsigned long addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1829) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1830) struct page *page;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1831) int nid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1832)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1833) if (!pte_present(pte))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1834) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1835)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1836) page = vm_normal_page(vma, addr, pte);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1837) if (!page)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1838) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1839)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1840) if (PageReserved(page))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1841) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1842)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1843) nid = page_to_nid(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1844) if (!node_isset(nid, node_states[N_MEMORY]))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1845) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1846)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1847) return page;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1848) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1849)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1850) #ifdef CONFIG_TRANSPARENT_HUGEPAGE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1851) static struct page *can_gather_numa_stats_pmd(pmd_t pmd,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1852) struct vm_area_struct *vma,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1853) unsigned long addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1854) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1855) struct page *page;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1856) int nid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1857)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1858) if (!pmd_present(pmd))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1859) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1860)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1861) page = vm_normal_page_pmd(vma, addr, pmd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1862) if (!page)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1863) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1864)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1865) if (PageReserved(page))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1866) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1867)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1868) nid = page_to_nid(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1869) if (!node_isset(nid, node_states[N_MEMORY]))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1870) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1871)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1872) return page;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1873) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1874) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1875)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1876) static int gather_pte_stats(pmd_t *pmd, unsigned long addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1877) unsigned long end, struct mm_walk *walk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1878) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1879) struct numa_maps *md = walk->private;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1880) struct vm_area_struct *vma = walk->vma;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1881) spinlock_t *ptl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1882) pte_t *orig_pte;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1883) pte_t *pte;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1884)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1885) #ifdef CONFIG_TRANSPARENT_HUGEPAGE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1886) ptl = pmd_trans_huge_lock(pmd, vma);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1887) if (ptl) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1888) struct page *page;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1889)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1890) page = can_gather_numa_stats_pmd(*pmd, vma, addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1891) if (page)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1892) gather_stats(page, md, pmd_dirty(*pmd),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1893) HPAGE_PMD_SIZE/PAGE_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1894) spin_unlock(ptl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1895) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1896) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1897)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1898) if (pmd_trans_unstable(pmd))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1899) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1900) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1901) orig_pte = pte = pte_offset_map_lock(walk->mm, pmd, addr, &ptl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1902) do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1903) struct page *page = can_gather_numa_stats(*pte, vma, addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1904) if (!page)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1905) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1906) gather_stats(page, md, pte_dirty(*pte), 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1907)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1908) } while (pte++, addr += PAGE_SIZE, addr != end);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1909) pte_unmap_unlock(orig_pte, ptl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1910) cond_resched();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1911) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1912) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1913) #ifdef CONFIG_HUGETLB_PAGE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1914) static int gather_hugetlb_stats(pte_t *pte, unsigned long hmask,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1915) unsigned long addr, unsigned long end, struct mm_walk *walk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1916) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1917) pte_t huge_pte = huge_ptep_get(pte);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1918) struct numa_maps *md;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1919) struct page *page;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1920)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1921) if (!pte_present(huge_pte))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1922) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1923)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1924) page = pte_page(huge_pte);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1925) if (!page)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1926) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1927)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1928) md = walk->private;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1929) gather_stats(page, md, pte_dirty(huge_pte), 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1930) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1931) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1932)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1933) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1934) static int gather_hugetlb_stats(pte_t *pte, unsigned long hmask,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1935) unsigned long addr, unsigned long end, struct mm_walk *walk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1936) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1937) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1938) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1939) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1940)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1941) static const struct mm_walk_ops show_numa_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1942) .hugetlb_entry = gather_hugetlb_stats,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1943) .pmd_entry = gather_pte_stats,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1944) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1945)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1946) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1947) * Display pages allocated per node and memory policy via /proc.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1948) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1949) static int show_numa_map(struct seq_file *m, void *v)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1950) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1951) struct numa_maps_private *numa_priv = m->private;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1952) struct proc_maps_private *proc_priv = &numa_priv->proc_maps;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1953) struct vm_area_struct *vma = v;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1954) struct numa_maps *md = &numa_priv->md;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1955) struct file *file = vma->vm_file;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1956) struct mm_struct *mm = vma->vm_mm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1957) struct mempolicy *pol;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1958) char buffer[64];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1959) int nid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1960)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1961) if (!mm)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1962) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1963)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1964) /* Ensure we start with an empty set of numa_maps statistics. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1965) memset(md, 0, sizeof(*md));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1966)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1967) pol = __get_vma_policy(vma, vma->vm_start);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1968) if (pol) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1969) mpol_to_str(buffer, sizeof(buffer), pol);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1970) mpol_cond_put(pol);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1971) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1972) mpol_to_str(buffer, sizeof(buffer), proc_priv->task_mempolicy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1973) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1974)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1975) seq_printf(m, "%08lx %s", vma->vm_start, buffer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1976)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1977) if (file) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1978) seq_puts(m, " file=");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1979) seq_file_path(m, file, "\n\t= ");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1980) } else if (vma->vm_start <= mm->brk && vma->vm_end >= mm->start_brk) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1981) seq_puts(m, " heap");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1982) } else if (is_stack(vma)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1983) seq_puts(m, " stack");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1984) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1985)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1986) if (is_vm_hugetlb_page(vma))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1987) seq_puts(m, " huge");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1988)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1989) /* mmap_lock is held by m_start */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1990) walk_page_vma(vma, &show_numa_ops, md);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1991)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1992) if (!md->pages)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1993) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1994)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1995) if (md->anon)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1996) seq_printf(m, " anon=%lu", md->anon);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1997)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1998) if (md->dirty)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1999) seq_printf(m, " dirty=%lu", md->dirty);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2000)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2001) if (md->pages != md->anon && md->pages != md->dirty)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2002) seq_printf(m, " mapped=%lu", md->pages);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2003)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2004) if (md->mapcount_max > 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2005) seq_printf(m, " mapmax=%lu", md->mapcount_max);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2006)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2007) if (md->swapcache)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2008) seq_printf(m, " swapcache=%lu", md->swapcache);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2009)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2010) if (md->active < md->pages && !is_vm_hugetlb_page(vma))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2011) seq_printf(m, " active=%lu", md->active);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2012)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2013) if (md->writeback)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2014) seq_printf(m, " writeback=%lu", md->writeback);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2015)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2016) for_each_node_state(nid, N_MEMORY)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2017) if (md->node[nid])
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2018) seq_printf(m, " N%d=%lu", nid, md->node[nid]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2019)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2020) seq_printf(m, " kernelpagesize_kB=%lu", vma_kernel_pagesize(vma) >> 10);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2021) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2022) seq_putc(m, '\n');
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2023) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2024) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2025)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2026) static const struct seq_operations proc_pid_numa_maps_op = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2027) .start = m_start,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2028) .next = m_next,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2029) .stop = m_stop,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2030) .show = show_numa_map,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2031) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2032)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2033) static int pid_numa_maps_open(struct inode *inode, struct file *file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2034) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2035) return proc_maps_open(inode, file, &proc_pid_numa_maps_op,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2036) sizeof(struct numa_maps_private));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2037) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2038)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2039) const struct file_operations proc_pid_numa_maps_operations = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2040) .open = pid_numa_maps_open,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2041) .read = seq_read,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2042) .llseek = seq_lseek,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2043) .release = proc_map_release,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2044) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2045)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2046) #endif /* CONFIG_NUMA */
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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