^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) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * Read-Copy Update module-based scalability-test facility
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright (C) IBM Corporation, 2015
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * Authors: Paul E. McKenney <paulmck@linux.ibm.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #define pr_fmt(fmt) fmt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/kthread.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/err.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/spinlock.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <linux/smp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <linux/rcupdate.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include <linux/interrupt.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #include <linux/sched.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #include <uapi/linux/sched/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #include <linux/atomic.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #include <linux/bitops.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #include <linux/completion.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) #include <linux/moduleparam.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) #include <linux/percpu.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) #include <linux/notifier.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) #include <linux/reboot.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) #include <linux/freezer.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) #include <linux/cpu.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) #include <linux/delay.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) #include <linux/stat.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) #include <linux/srcu.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) #include <asm/byteorder.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) #include <linux/torture.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) #include <linux/vmalloc.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) #include "rcu.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) MODULE_LICENSE("GPL");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) MODULE_AUTHOR("Paul E. McKenney <paulmck@linux.ibm.com>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) #define SCALE_FLAG "-scale:"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) #define SCALEOUT_STRING(s) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) pr_alert("%s" SCALE_FLAG " %s\n", scale_type, s)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) #define VERBOSE_SCALEOUT_STRING(s) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) do { if (verbose) pr_alert("%s" SCALE_FLAG " %s\n", scale_type, s); } while (0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) #define VERBOSE_SCALEOUT_ERRSTRING(s) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) do { if (verbose) pr_alert("%s" SCALE_FLAG "!!! %s\n", scale_type, s); } while (0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) * The intended use cases for the nreaders and nwriters module parameters
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) * are as follows:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) * 1. Specify only the nr_cpus kernel boot parameter. This will
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) * set both nreaders and nwriters to the value specified by
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) * nr_cpus for a mixed reader/writer test.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) * 2. Specify the nr_cpus kernel boot parameter, but set
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) * rcuscale.nreaders to zero. This will set nwriters to the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) * value specified by nr_cpus for an update-only test.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) * 3. Specify the nr_cpus kernel boot parameter, but set
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) * rcuscale.nwriters to zero. This will set nreaders to the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) * value specified by nr_cpus for a read-only test.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) * Various other use cases may of course be specified.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) * Note that this test's readers are intended only as a test load for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) * the writers. The reader scalability statistics will be overly
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) * pessimistic due to the per-critical-section interrupt disabling,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) * test-end checks, and the pair of calls through pointers.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) #ifdef MODULE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) # define RCUSCALE_SHUTDOWN 0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) # define RCUSCALE_SHUTDOWN 1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) torture_param(bool, gp_async, false, "Use asynchronous GP wait primitives");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) torture_param(int, gp_async_max, 1000, "Max # outstanding waits per reader");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) torture_param(bool, gp_exp, false, "Use expedited GP wait primitives");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) torture_param(int, holdoff, 10, "Holdoff time before test start (s)");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) torture_param(int, nreaders, -1, "Number of RCU reader threads");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) torture_param(int, nwriters, -1, "Number of RCU updater threads");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) torture_param(bool, shutdown, RCUSCALE_SHUTDOWN,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) "Shutdown at end of scalability tests.");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) torture_param(int, verbose, 1, "Enable verbose debugging printk()s");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) torture_param(int, writer_holdoff, 0, "Holdoff (us) between GPs, zero to disable");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) torture_param(int, kfree_rcu_test, 0, "Do we run a kfree_rcu() scale test?");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) torture_param(int, kfree_mult, 1, "Multiple of kfree_obj size to allocate.");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) static char *scale_type = "rcu";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) module_param(scale_type, charp, 0444);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) MODULE_PARM_DESC(scale_type, "Type of RCU to scalability-test (rcu, srcu, ...)");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) static int nrealreaders;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) static int nrealwriters;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) static struct task_struct **writer_tasks;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) static struct task_struct **reader_tasks;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) static struct task_struct *shutdown_task;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) static u64 **writer_durations;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) static int *writer_n_durations;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) static atomic_t n_rcu_scale_reader_started;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) static atomic_t n_rcu_scale_writer_started;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) static atomic_t n_rcu_scale_writer_finished;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) static wait_queue_head_t shutdown_wq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) static u64 t_rcu_scale_writer_started;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) static u64 t_rcu_scale_writer_finished;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) static unsigned long b_rcu_gp_test_started;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) static unsigned long b_rcu_gp_test_finished;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) static DEFINE_PER_CPU(atomic_t, n_async_inflight);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) #define MAX_MEAS 10000
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) #define MIN_MEAS 100
^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) * Operations vector for selecting different types of tests.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) struct rcu_scale_ops {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) int ptype;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) void (*init)(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) void (*cleanup)(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) int (*readlock)(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) void (*readunlock)(int idx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) unsigned long (*get_gp_seq)(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) unsigned long (*gp_diff)(unsigned long new, unsigned long old);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) unsigned long (*exp_completed)(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) void (*async)(struct rcu_head *head, rcu_callback_t func);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) void (*gp_barrier)(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) void (*sync)(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) void (*exp_sync)(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) const char *name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) static struct rcu_scale_ops *cur_ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) * Definitions for rcu scalability testing.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) static int rcu_scale_read_lock(void) __acquires(RCU)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) rcu_read_lock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) static void rcu_scale_read_unlock(int idx) __releases(RCU)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) rcu_read_unlock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) static unsigned long __maybe_unused rcu_no_completed(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) static void rcu_sync_scale_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) static struct rcu_scale_ops rcu_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) .ptype = RCU_FLAVOR,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) .init = rcu_sync_scale_init,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) .readlock = rcu_scale_read_lock,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) .readunlock = rcu_scale_read_unlock,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) .get_gp_seq = rcu_get_gp_seq,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) .gp_diff = rcu_seq_diff,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) .exp_completed = rcu_exp_batches_completed,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) .async = call_rcu,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) .gp_barrier = rcu_barrier,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) .sync = synchronize_rcu,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) .exp_sync = synchronize_rcu_expedited,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) .name = "rcu"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) * Definitions for srcu scalability testing.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) DEFINE_STATIC_SRCU(srcu_ctl_scale);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) static struct srcu_struct *srcu_ctlp = &srcu_ctl_scale;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) static int srcu_scale_read_lock(void) __acquires(srcu_ctlp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) return srcu_read_lock(srcu_ctlp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) static void srcu_scale_read_unlock(int idx) __releases(srcu_ctlp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) srcu_read_unlock(srcu_ctlp, idx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) static unsigned long srcu_scale_completed(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) return srcu_batches_completed(srcu_ctlp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) static void srcu_call_rcu(struct rcu_head *head, rcu_callback_t func)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) call_srcu(srcu_ctlp, head, func);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) static void srcu_rcu_barrier(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) srcu_barrier(srcu_ctlp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) static void srcu_scale_synchronize(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) synchronize_srcu(srcu_ctlp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) static void srcu_scale_synchronize_expedited(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) synchronize_srcu_expedited(srcu_ctlp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) static struct rcu_scale_ops srcu_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) .ptype = SRCU_FLAVOR,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) .init = rcu_sync_scale_init,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) .readlock = srcu_scale_read_lock,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) .readunlock = srcu_scale_read_unlock,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) .get_gp_seq = srcu_scale_completed,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) .gp_diff = rcu_seq_diff,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) .exp_completed = srcu_scale_completed,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) .async = srcu_call_rcu,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) .gp_barrier = srcu_rcu_barrier,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) .sync = srcu_scale_synchronize,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) .exp_sync = srcu_scale_synchronize_expedited,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) .name = "srcu"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) static struct srcu_struct srcud;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) static void srcu_sync_scale_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) srcu_ctlp = &srcud;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) init_srcu_struct(srcu_ctlp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) static void srcu_sync_scale_cleanup(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) cleanup_srcu_struct(srcu_ctlp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) static struct rcu_scale_ops srcud_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) .ptype = SRCU_FLAVOR,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) .init = srcu_sync_scale_init,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) .cleanup = srcu_sync_scale_cleanup,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) .readlock = srcu_scale_read_lock,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) .readunlock = srcu_scale_read_unlock,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) .get_gp_seq = srcu_scale_completed,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) .gp_diff = rcu_seq_diff,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) .exp_completed = srcu_scale_completed,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) .async = srcu_call_rcu,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) .gp_barrier = srcu_rcu_barrier,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) .sync = srcu_scale_synchronize,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) .exp_sync = srcu_scale_synchronize_expedited,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) .name = "srcud"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) * Definitions for RCU-tasks scalability testing.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) static int tasks_scale_read_lock(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) static void tasks_scale_read_unlock(int idx)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) static struct rcu_scale_ops tasks_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) .ptype = RCU_TASKS_FLAVOR,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) .init = rcu_sync_scale_init,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) .readlock = tasks_scale_read_lock,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) .readunlock = tasks_scale_read_unlock,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) .get_gp_seq = rcu_no_completed,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) .gp_diff = rcu_seq_diff,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) .async = call_rcu_tasks,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) .gp_barrier = rcu_barrier_tasks,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) .sync = synchronize_rcu_tasks,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) .exp_sync = synchronize_rcu_tasks,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) .name = "tasks"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) static unsigned long rcuscale_seq_diff(unsigned long new, unsigned long old)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) if (!cur_ops->gp_diff)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) return new - old;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) return cur_ops->gp_diff(new, old);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) * If scalability tests complete, wait for shutdown to commence.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) static void rcu_scale_wait_shutdown(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) cond_resched_tasks_rcu_qs();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) if (atomic_read(&n_rcu_scale_writer_finished) < nrealwriters)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) while (!torture_must_stop())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) schedule_timeout_uninterruptible(1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) * RCU scalability reader kthread. Repeatedly does empty RCU read-side
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) * critical section, minimizing update-side interference. However, the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) * point of this test is not to evaluate reader scalability, but instead
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) * to serve as a test load for update-side scalability testing.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) static int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) rcu_scale_reader(void *arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) int idx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) long me = (long)arg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) VERBOSE_SCALEOUT_STRING("rcu_scale_reader task started");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) set_cpus_allowed_ptr(current, cpumask_of(me % nr_cpu_ids));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) set_user_nice(current, MAX_NICE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) atomic_inc(&n_rcu_scale_reader_started);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) local_irq_save(flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) idx = cur_ops->readlock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) cur_ops->readunlock(idx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) local_irq_restore(flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) rcu_scale_wait_shutdown();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) } while (!torture_must_stop());
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) torture_kthread_stopping("rcu_scale_reader");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) * Callback function for asynchronous grace periods from rcu_scale_writer().
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) static void rcu_scale_async_cb(struct rcu_head *rhp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) atomic_dec(this_cpu_ptr(&n_async_inflight));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) kfree(rhp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) * RCU scale writer kthread. Repeatedly does a grace period.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) static int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) rcu_scale_writer(void *arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) int i = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) int i_max;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) long me = (long)arg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) struct rcu_head *rhp = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) bool started = false, done = false, alldone = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) u64 t;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) u64 *wdp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) u64 *wdpp = writer_durations[me];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) VERBOSE_SCALEOUT_STRING("rcu_scale_writer task started");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) WARN_ON(!wdpp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) set_cpus_allowed_ptr(current, cpumask_of(me % nr_cpu_ids));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) sched_set_fifo_low(current);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) if (holdoff)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) schedule_timeout_uninterruptible(holdoff * HZ);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) * Wait until rcu_end_inkernel_boot() is called for normal GP tests
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) * so that RCU is not always expedited for normal GP tests.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) * The system_state test is approximate, but works well in practice.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) while (!gp_exp && system_state != SYSTEM_RUNNING)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) schedule_timeout_uninterruptible(1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) t = ktime_get_mono_fast_ns();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) if (atomic_inc_return(&n_rcu_scale_writer_started) >= nrealwriters) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) t_rcu_scale_writer_started = t;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) if (gp_exp) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) b_rcu_gp_test_started =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) cur_ops->exp_completed() / 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) b_rcu_gp_test_started = cur_ops->get_gp_seq();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) if (writer_holdoff)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) udelay(writer_holdoff);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) wdp = &wdpp[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) *wdp = ktime_get_mono_fast_ns();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) if (gp_async) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) retry:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) if (!rhp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) rhp = kmalloc(sizeof(*rhp), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) if (rhp && atomic_read(this_cpu_ptr(&n_async_inflight)) < gp_async_max) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) atomic_inc(this_cpu_ptr(&n_async_inflight));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) cur_ops->async(rhp, rcu_scale_async_cb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) rhp = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) } else if (!kthread_should_stop()) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) cur_ops->gp_barrier();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) goto retry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) kfree(rhp); /* Because we are stopping. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) } else if (gp_exp) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) cur_ops->exp_sync();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) cur_ops->sync();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) t = ktime_get_mono_fast_ns();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) *wdp = t - *wdp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) i_max = i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) if (!started &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) atomic_read(&n_rcu_scale_writer_started) >= nrealwriters)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) started = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) if (!done && i >= MIN_MEAS) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) done = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) sched_set_normal(current, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) pr_alert("%s%s rcu_scale_writer %ld has %d measurements\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) scale_type, SCALE_FLAG, me, MIN_MEAS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) if (atomic_inc_return(&n_rcu_scale_writer_finished) >=
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) nrealwriters) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) schedule_timeout_interruptible(10);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) rcu_ftrace_dump(DUMP_ALL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) SCALEOUT_STRING("Test complete");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) t_rcu_scale_writer_finished = t;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) if (gp_exp) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) b_rcu_gp_test_finished =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) cur_ops->exp_completed() / 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) b_rcu_gp_test_finished =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) cur_ops->get_gp_seq();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) if (shutdown) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) smp_mb(); /* Assign before wake. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) wake_up(&shutdown_wq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) if (done && !alldone &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) atomic_read(&n_rcu_scale_writer_finished) >= nrealwriters)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) alldone = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) if (started && !alldone && i < MAX_MEAS - 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) i++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) rcu_scale_wait_shutdown();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) } while (!torture_must_stop());
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) if (gp_async) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) cur_ops->gp_barrier();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) writer_n_durations[me] = i_max;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) torture_kthread_stopping("rcu_scale_writer");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) static void
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) rcu_scale_print_module_parms(struct rcu_scale_ops *cur_ops, const char *tag)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) pr_alert("%s" SCALE_FLAG
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) "--- %s: nreaders=%d nwriters=%d verbose=%d shutdown=%d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) scale_type, tag, nrealreaders, nrealwriters, verbose, shutdown);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) static void
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) rcu_scale_cleanup(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) int j;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) int ngps = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) u64 *wdp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) u64 *wdpp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) * Would like warning at start, but everything is expedited
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) * during the mid-boot phase, so have to wait till the end.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) if (rcu_gp_is_expedited() && !rcu_gp_is_normal() && !gp_exp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) VERBOSE_SCALEOUT_ERRSTRING("All grace periods expedited, no normal ones to measure!");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) if (rcu_gp_is_normal() && gp_exp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) VERBOSE_SCALEOUT_ERRSTRING("All grace periods normal, no expedited ones to measure!");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) if (gp_exp && gp_async)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) VERBOSE_SCALEOUT_ERRSTRING("No expedited async GPs, so went with async!");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) if (torture_cleanup_begin())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) if (!cur_ops) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) torture_cleanup_end();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) if (reader_tasks) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) for (i = 0; i < nrealreaders; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) torture_stop_kthread(rcu_scale_reader,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) reader_tasks[i]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) kfree(reader_tasks);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507) if (writer_tasks) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) for (i = 0; i < nrealwriters; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509) torture_stop_kthread(rcu_scale_writer,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510) writer_tasks[i]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) if (!writer_n_durations)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) j = writer_n_durations[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514) pr_alert("%s%s writer %d gps: %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515) scale_type, SCALE_FLAG, i, j);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) ngps += j;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) pr_alert("%s%s start: %llu end: %llu duration: %llu gps: %d batches: %ld\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519) scale_type, SCALE_FLAG,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520) t_rcu_scale_writer_started, t_rcu_scale_writer_finished,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) t_rcu_scale_writer_finished -
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522) t_rcu_scale_writer_started,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523) ngps,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524) rcuscale_seq_diff(b_rcu_gp_test_finished,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525) b_rcu_gp_test_started));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526) for (i = 0; i < nrealwriters; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) if (!writer_durations)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) if (!writer_n_durations)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) wdpp = writer_durations[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532) if (!wdpp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534) for (j = 0; j <= writer_n_durations[i]; j++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535) wdp = &wdpp[j];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536) pr_alert("%s%s %4d writer-duration: %5d %llu\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537) scale_type, SCALE_FLAG,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538) i, j, *wdp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539) if (j % 100 == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540) schedule_timeout_uninterruptible(1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542) kfree(writer_durations[i]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544) kfree(writer_tasks);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545) kfree(writer_durations);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546) kfree(writer_n_durations);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549) /* Do torture-type-specific cleanup operations. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550) if (cur_ops->cleanup != NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551) cur_ops->cleanup();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553) torture_cleanup_end();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557) * Return the number if non-negative. If -1, the number of CPUs.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 558) * If less than -1, that much less than the number of CPUs, but
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 559) * at least one.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 560) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 561) static int compute_real(int n)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 562) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 563) int nr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 564)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 565) if (n >= 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 566) nr = n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 567) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 568) nr = num_online_cpus() + 1 + n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 569) if (nr <= 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 570) nr = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 571) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 572) return nr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 573) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 574)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 575) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 576) * RCU scalability shutdown kthread. Just waits to be awakened, then shuts
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 577) * down system.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 578) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 579) static int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 580) rcu_scale_shutdown(void *arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 581) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 582) wait_event(shutdown_wq,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 583) atomic_read(&n_rcu_scale_writer_finished) >= nrealwriters);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 584) smp_mb(); /* Wake before output. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 585) rcu_scale_cleanup();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 586) kernel_power_off();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 587) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 588) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 589)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 590) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 591) * kfree_rcu() scalability tests: Start a kfree_rcu() loop on all CPUs for number
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 592) * of iterations and measure total time and number of GP for all iterations to complete.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 593) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 594)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 595) torture_param(int, kfree_nthreads, -1, "Number of threads running loops of kfree_rcu().");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 596) torture_param(int, kfree_alloc_num, 8000, "Number of allocations and frees done in an iteration.");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 597) torture_param(int, kfree_loops, 10, "Number of loops doing kfree_alloc_num allocations and frees.");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 598)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 599) static struct task_struct **kfree_reader_tasks;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 600) static int kfree_nrealthreads;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 601) static atomic_t n_kfree_scale_thread_started;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 602) static atomic_t n_kfree_scale_thread_ended;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 603)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 604) struct kfree_obj {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 605) char kfree_obj[8];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 606) struct rcu_head rh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 607) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 608)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 609) static int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 610) kfree_scale_thread(void *arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 611) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 612) int i, loop = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 613) long me = (long)arg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 614) struct kfree_obj *alloc_ptr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 615) u64 start_time, end_time;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 616) long long mem_begin, mem_during = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 617)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 618) VERBOSE_SCALEOUT_STRING("kfree_scale_thread task started");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 619) set_cpus_allowed_ptr(current, cpumask_of(me % nr_cpu_ids));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 620) set_user_nice(current, MAX_NICE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 621)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 622) start_time = ktime_get_mono_fast_ns();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 623)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 624) if (atomic_inc_return(&n_kfree_scale_thread_started) >= kfree_nrealthreads) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 625) if (gp_exp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 626) b_rcu_gp_test_started = cur_ops->exp_completed() / 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 627) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 628) b_rcu_gp_test_started = cur_ops->get_gp_seq();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 629) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 630)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 631) do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 632) if (!mem_during) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 633) mem_during = mem_begin = si_mem_available();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 634) } else if (loop % (kfree_loops / 4) == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 635) mem_during = (mem_during + si_mem_available()) / 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 636) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 637)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 638) for (i = 0; i < kfree_alloc_num; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 639) alloc_ptr = kmalloc(kfree_mult * sizeof(struct kfree_obj), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 640) if (!alloc_ptr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 641) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 642)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 643) kfree_rcu(alloc_ptr, rh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 644) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 645)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 646) cond_resched();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 647) } while (!torture_must_stop() && ++loop < kfree_loops);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 648)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 649) if (atomic_inc_return(&n_kfree_scale_thread_ended) >= kfree_nrealthreads) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 650) end_time = ktime_get_mono_fast_ns();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 651)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 652) if (gp_exp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 653) b_rcu_gp_test_finished = cur_ops->exp_completed() / 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 654) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 655) b_rcu_gp_test_finished = cur_ops->get_gp_seq();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 656)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 657) pr_alert("Total time taken by all kfree'ers: %llu ns, loops: %d, batches: %ld, memory footprint: %lldMB\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 658) (unsigned long long)(end_time - start_time), kfree_loops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 659) rcuscale_seq_diff(b_rcu_gp_test_finished, b_rcu_gp_test_started),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 660) (mem_begin - mem_during) >> (20 - PAGE_SHIFT));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 661)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 662) if (shutdown) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 663) smp_mb(); /* Assign before wake. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 664) wake_up(&shutdown_wq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 665) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 666) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 667)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 668) torture_kthread_stopping("kfree_scale_thread");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 669) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 670) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 671)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 672) static void
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 673) kfree_scale_cleanup(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 674) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 675) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 676)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 677) if (torture_cleanup_begin())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 678) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 679)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 680) if (kfree_reader_tasks) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 681) for (i = 0; i < kfree_nrealthreads; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 682) torture_stop_kthread(kfree_scale_thread,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 683) kfree_reader_tasks[i]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 684) kfree(kfree_reader_tasks);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 685) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 686)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 687) torture_cleanup_end();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 688) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 689)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 690) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 691) * shutdown kthread. Just waits to be awakened, then shuts down system.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 692) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 693) static int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 694) kfree_scale_shutdown(void *arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 695) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 696) wait_event(shutdown_wq,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 697) atomic_read(&n_kfree_scale_thread_ended) >= kfree_nrealthreads);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 698)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 699) smp_mb(); /* Wake before output. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 700)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 701) kfree_scale_cleanup();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 702) kernel_power_off();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 703) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 704) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 705)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 706) static int __init
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 707) kfree_scale_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 708) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 709) long i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 710) int firsterr = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 711)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 712) kfree_nrealthreads = compute_real(kfree_nthreads);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 713) /* Start up the kthreads. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 714) if (shutdown) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 715) init_waitqueue_head(&shutdown_wq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 716) firsterr = torture_create_kthread(kfree_scale_shutdown, NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 717) shutdown_task);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 718) if (firsterr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 719) goto unwind;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 720) schedule_timeout_uninterruptible(1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 721) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 722)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 723) pr_alert("kfree object size=%zu\n", kfree_mult * sizeof(struct kfree_obj));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 724)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 725) kfree_reader_tasks = kcalloc(kfree_nrealthreads, sizeof(kfree_reader_tasks[0]),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 726) GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 727) if (kfree_reader_tasks == NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 728) firsterr = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 729) goto unwind;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 730) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 731)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 732) for (i = 0; i < kfree_nrealthreads; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 733) firsterr = torture_create_kthread(kfree_scale_thread, (void *)i,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 734) kfree_reader_tasks[i]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 735) if (firsterr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 736) goto unwind;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 737) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 738)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 739) while (atomic_read(&n_kfree_scale_thread_started) < kfree_nrealthreads)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 740) schedule_timeout_uninterruptible(1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 741)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 742) torture_init_end();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 743) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 744)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 745) unwind:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 746) torture_init_end();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 747) kfree_scale_cleanup();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 748) return firsterr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 749) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 750)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 751) static int __init
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 752) rcu_scale_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 753) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 754) long i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 755) int firsterr = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 756) static struct rcu_scale_ops *scale_ops[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 757) &rcu_ops, &srcu_ops, &srcud_ops, &tasks_ops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 758) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 759)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 760) if (!torture_init_begin(scale_type, verbose))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 761) return -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 762)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 763) /* Process args and announce that the scalability'er is on the job. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 764) for (i = 0; i < ARRAY_SIZE(scale_ops); i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 765) cur_ops = scale_ops[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 766) if (strcmp(scale_type, cur_ops->name) == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 767) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 768) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 769) if (i == ARRAY_SIZE(scale_ops)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 770) pr_alert("rcu-scale: invalid scale type: \"%s\"\n", scale_type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 771) pr_alert("rcu-scale types:");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 772) for (i = 0; i < ARRAY_SIZE(scale_ops); i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 773) pr_cont(" %s", scale_ops[i]->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 774) pr_cont("\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 775) WARN_ON(!IS_MODULE(CONFIG_RCU_SCALE_TEST));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 776) firsterr = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 777) cur_ops = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 778) goto unwind;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 779) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 780) if (cur_ops->init)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 781) cur_ops->init();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 782)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 783) if (kfree_rcu_test)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 784) return kfree_scale_init();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 785)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 786) nrealwriters = compute_real(nwriters);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 787) nrealreaders = compute_real(nreaders);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 788) atomic_set(&n_rcu_scale_reader_started, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 789) atomic_set(&n_rcu_scale_writer_started, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 790) atomic_set(&n_rcu_scale_writer_finished, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 791) rcu_scale_print_module_parms(cur_ops, "Start of test");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 792)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 793) /* Start up the kthreads. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 794)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 795) if (shutdown) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 796) init_waitqueue_head(&shutdown_wq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 797) firsterr = torture_create_kthread(rcu_scale_shutdown, NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 798) shutdown_task);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 799) if (firsterr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 800) goto unwind;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 801) schedule_timeout_uninterruptible(1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 802) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 803) reader_tasks = kcalloc(nrealreaders, sizeof(reader_tasks[0]),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 804) GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 805) if (reader_tasks == NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 806) VERBOSE_SCALEOUT_ERRSTRING("out of memory");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 807) firsterr = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 808) goto unwind;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 809) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 810) for (i = 0; i < nrealreaders; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 811) firsterr = torture_create_kthread(rcu_scale_reader, (void *)i,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 812) reader_tasks[i]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 813) if (firsterr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 814) goto unwind;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 815) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 816) while (atomic_read(&n_rcu_scale_reader_started) < nrealreaders)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 817) schedule_timeout_uninterruptible(1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 818) writer_tasks = kcalloc(nrealwriters, sizeof(reader_tasks[0]),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 819) GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 820) writer_durations = kcalloc(nrealwriters, sizeof(*writer_durations),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 821) GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 822) writer_n_durations =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 823) kcalloc(nrealwriters, sizeof(*writer_n_durations),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 824) GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 825) if (!writer_tasks || !writer_durations || !writer_n_durations) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 826) VERBOSE_SCALEOUT_ERRSTRING("out of memory");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 827) firsterr = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 828) goto unwind;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 829) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 830) for (i = 0; i < nrealwriters; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 831) writer_durations[i] =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 832) kcalloc(MAX_MEAS, sizeof(*writer_durations[i]),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 833) GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 834) if (!writer_durations[i]) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 835) firsterr = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 836) goto unwind;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 837) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 838) firsterr = torture_create_kthread(rcu_scale_writer, (void *)i,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 839) writer_tasks[i]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 840) if (firsterr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 841) goto unwind;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 842) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 843) torture_init_end();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 844) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 845)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 846) unwind:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 847) torture_init_end();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 848) rcu_scale_cleanup();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 849) return firsterr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 850) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 851)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 852) module_init(rcu_scale_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 853) module_exit(rcu_scale_cleanup);
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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