Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) #include "cgroup-internal.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4) #include <linux/sched/cputime.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6) static DEFINE_SPINLOCK(cgroup_rstat_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7) static DEFINE_PER_CPU(raw_spinlock_t, cgroup_rstat_cpu_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) static void cgroup_base_stat_flush(struct cgroup *cgrp, int cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) static struct cgroup_rstat_cpu *cgroup_rstat_cpu(struct cgroup *cgrp, int cpu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) 	return per_cpu_ptr(cgrp->rstat_cpu, cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17)  * cgroup_rstat_updated - keep track of updated rstat_cpu
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18)  * @cgrp: target cgroup
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19)  * @cpu: cpu on which rstat_cpu was updated
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21)  * @cgrp's rstat_cpu on @cpu was updated.  Put it on the parent's matching
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22)  * rstat_cpu->updated_children list.  See the comment on top of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23)  * cgroup_rstat_cpu definition for details.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) void cgroup_rstat_updated(struct cgroup *cgrp, int cpu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) 	raw_spinlock_t *cpu_lock = per_cpu_ptr(&cgroup_rstat_cpu_lock, cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) 	struct cgroup *parent;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 	unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 	/* nothing to do for root */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 	if (!cgroup_parent(cgrp))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 	 * Speculative already-on-list test. This may race leading to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 	 * temporary inaccuracies, which is fine.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 	 *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 	 * Because @parent's updated_children is terminated with @parent
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 	 * instead of NULL, we can tell whether @cgrp is on the list by
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 	 * testing the next pointer for NULL.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 	if (cgroup_rstat_cpu(cgrp, cpu)->updated_next)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 	raw_spin_lock_irqsave(cpu_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 	/* put @cgrp and all ancestors on the corresponding updated lists */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 	for (parent = cgroup_parent(cgrp); parent;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 	     cgrp = parent, parent = cgroup_parent(cgrp)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 		struct cgroup_rstat_cpu *rstatc = cgroup_rstat_cpu(cgrp, cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 		struct cgroup_rstat_cpu *prstatc = cgroup_rstat_cpu(parent, cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 		/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 		 * Both additions and removals are bottom-up.  If a cgroup
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 		 * is already in the tree, all ancestors are.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 		if (rstatc->updated_next)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 		rstatc->updated_next = prstatc->updated_children;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 		prstatc->updated_children = cgrp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 	raw_spin_unlock_irqrestore(cpu_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69)  * cgroup_rstat_cpu_pop_updated - iterate and dismantle rstat_cpu updated tree
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70)  * @pos: current position
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71)  * @root: root of the tree to traversal
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72)  * @cpu: target cpu
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74)  * Walks the udpated rstat_cpu tree on @cpu from @root.  %NULL @pos starts
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75)  * the traversal and %NULL return indicates the end.  During traversal,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76)  * each returned cgroup is unlinked from the tree.  Must be called with the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77)  * matching cgroup_rstat_cpu_lock held.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79)  * The only ordering guarantee is that, for a parent and a child pair
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80)  * covered by a given traversal, if a child is visited, its parent is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81)  * guaranteed to be visited afterwards.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) static struct cgroup *cgroup_rstat_cpu_pop_updated(struct cgroup *pos,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 						   struct cgroup *root, int cpu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 	struct cgroup_rstat_cpu *rstatc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 	if (pos == root)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 		return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 	 * We're gonna walk down to the first leaf and visit/remove it.  We
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 	 * can pick whatever unvisited node as the starting point.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 	if (!pos)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 		pos = root;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 	else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 		pos = cgroup_parent(pos);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 	/* walk down to the first leaf */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 	while (true) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 		rstatc = cgroup_rstat_cpu(pos, cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 		if (rstatc->updated_children == pos)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 		pos = rstatc->updated_children;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 	 * Unlink @pos from the tree.  As the updated_children list is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 	 * singly linked, we have to walk it to find the removal point.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 	 * However, due to the way we traverse, @pos will be the first
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 	 * child in most cases. The only exception is @root.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 	if (rstatc->updated_next) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 		struct cgroup *parent = cgroup_parent(pos);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 		struct cgroup_rstat_cpu *prstatc = cgroup_rstat_cpu(parent, cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 		struct cgroup_rstat_cpu *nrstatc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 		struct cgroup **nextp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 		nextp = &prstatc->updated_children;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 		while (true) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 			nrstatc = cgroup_rstat_cpu(*nextp, cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 			if (*nextp == pos)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 				break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 			WARN_ON_ONCE(*nextp == parent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 			nextp = &nrstatc->updated_next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 		*nextp = rstatc->updated_next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 		rstatc->updated_next = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 		return pos;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 	/* only happens for @root */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 	return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) /* see cgroup_rstat_flush() */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) static void cgroup_rstat_flush_locked(struct cgroup *cgrp, bool may_sleep)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 	__releases(&cgroup_rstat_lock) __acquires(&cgroup_rstat_lock)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 	int cpu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 	lockdep_assert_held(&cgroup_rstat_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 	for_each_possible_cpu(cpu) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 		raw_spinlock_t *cpu_lock = per_cpu_ptr(&cgroup_rstat_cpu_lock,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 						       cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 		struct cgroup *pos = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 		raw_spin_lock(cpu_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 		while ((pos = cgroup_rstat_cpu_pop_updated(pos, cgrp, cpu))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 			struct cgroup_subsys_state *css;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 			cgroup_base_stat_flush(pos, cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 			rcu_read_lock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 			list_for_each_entry_rcu(css, &pos->rstat_css_list,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 						rstat_css_node)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 				css->ss->css_rstat_flush(css, cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 			rcu_read_unlock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 		raw_spin_unlock(cpu_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 		/* if @may_sleep, play nice and yield if necessary */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 		if (may_sleep && (need_resched() ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 				  spin_needbreak(&cgroup_rstat_lock))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 			spin_unlock_irq(&cgroup_rstat_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 			if (!cond_resched())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 				cpu_relax();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 			spin_lock_irq(&cgroup_rstat_lock);
^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) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179)  * cgroup_rstat_flush - flush stats in @cgrp's subtree
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180)  * @cgrp: target cgroup
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182)  * Collect all per-cpu stats in @cgrp's subtree into the global counters
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183)  * and propagate them upwards.  After this function returns, all cgroups in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184)  * the subtree have up-to-date ->stat.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186)  * This also gets all cgroups in the subtree including @cgrp off the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187)  * ->updated_children lists.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189)  * This function may block.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) void cgroup_rstat_flush(struct cgroup *cgrp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 	might_sleep();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 	spin_lock_irq(&cgroup_rstat_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 	cgroup_rstat_flush_locked(cgrp, true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 	spin_unlock_irq(&cgroup_rstat_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) }
^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)  * cgroup_rstat_flush_irqsafe - irqsafe version of cgroup_rstat_flush()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202)  * @cgrp: target cgroup
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204)  * This function can be called from any context.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) void cgroup_rstat_flush_irqsafe(struct cgroup *cgrp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 	unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 	spin_lock_irqsave(&cgroup_rstat_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 	cgroup_rstat_flush_locked(cgrp, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 	spin_unlock_irqrestore(&cgroup_rstat_lock, flags);
^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) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216)  * cgroup_rstat_flush_begin - flush stats in @cgrp's subtree and hold
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217)  * @cgrp: target cgroup
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219)  * Flush stats in @cgrp's subtree and prevent further flushes.  Must be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220)  * paired with cgroup_rstat_flush_release().
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222)  * This function may block.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) void cgroup_rstat_flush_hold(struct cgroup *cgrp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 	__acquires(&cgroup_rstat_lock)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 	might_sleep();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 	spin_lock_irq(&cgroup_rstat_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 	cgroup_rstat_flush_locked(cgrp, true);
^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) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233)  * cgroup_rstat_flush_release - release cgroup_rstat_flush_hold()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) void cgroup_rstat_flush_release(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 	__releases(&cgroup_rstat_lock)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 	spin_unlock_irq(&cgroup_rstat_lock);
^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) int cgroup_rstat_init(struct cgroup *cgrp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 	int cpu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 	/* the root cgrp has rstat_cpu preallocated */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 	if (!cgrp->rstat_cpu) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 		cgrp->rstat_cpu = alloc_percpu(struct cgroup_rstat_cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 		if (!cgrp->rstat_cpu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 			return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 	/* ->updated_children list is self terminated */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 	for_each_possible_cpu(cpu) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 		struct cgroup_rstat_cpu *rstatc = cgroup_rstat_cpu(cgrp, cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 		rstatc->updated_children = cgrp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 		u64_stats_init(&rstatc->bsync);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) void cgroup_rstat_exit(struct cgroup *cgrp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 	int cpu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 	cgroup_rstat_flush(cgrp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 	/* sanity check */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 	for_each_possible_cpu(cpu) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 		struct cgroup_rstat_cpu *rstatc = cgroup_rstat_cpu(cgrp, cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 		if (WARN_ON_ONCE(rstatc->updated_children != cgrp) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 		    WARN_ON_ONCE(rstatc->updated_next))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 			return;
^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) 	free_percpu(cgrp->rstat_cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 	cgrp->rstat_cpu = NULL;
^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) void __init cgroup_rstat_boot(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 	int cpu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 	for_each_possible_cpu(cpu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 		raw_spin_lock_init(per_cpu_ptr(&cgroup_rstat_cpu_lock, cpu));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 	BUG_ON(cgroup_rstat_init(&cgrp_dfl_root.cgrp));
^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) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293)  * Functions for cgroup basic resource statistics implemented on top of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294)  * rstat.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) static void cgroup_base_stat_add(struct cgroup_base_stat *dst_bstat,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 				 struct cgroup_base_stat *src_bstat)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 	dst_bstat->cputime.utime += src_bstat->cputime.utime;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 	dst_bstat->cputime.stime += src_bstat->cputime.stime;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 	dst_bstat->cputime.sum_exec_runtime += src_bstat->cputime.sum_exec_runtime;
^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) static void cgroup_base_stat_sub(struct cgroup_base_stat *dst_bstat,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 				 struct cgroup_base_stat *src_bstat)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) 	dst_bstat->cputime.utime -= src_bstat->cputime.utime;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) 	dst_bstat->cputime.stime -= src_bstat->cputime.stime;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) 	dst_bstat->cputime.sum_exec_runtime -= src_bstat->cputime.sum_exec_runtime;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) static void cgroup_base_stat_flush(struct cgroup *cgrp, int cpu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) 	struct cgroup *parent = cgroup_parent(cgrp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) 	struct cgroup_rstat_cpu *rstatc = cgroup_rstat_cpu(cgrp, cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) 	struct cgroup_base_stat cur, delta;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) 	unsigned seq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) 	/* fetch the current per-cpu values */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) 	do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) 		seq = __u64_stats_fetch_begin(&rstatc->bsync);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) 		cur.cputime = rstatc->bstat.cputime;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) 	} while (__u64_stats_fetch_retry(&rstatc->bsync, seq));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) 	/* propagate percpu delta to global */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) 	delta = cur;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) 	cgroup_base_stat_sub(&delta, &rstatc->last_bstat);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) 	cgroup_base_stat_add(&cgrp->bstat, &delta);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) 	cgroup_base_stat_add(&rstatc->last_bstat, &delta);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) 	/* propagate global delta to parent */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) 	if (parent) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) 		delta = cgrp->bstat;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) 		cgroup_base_stat_sub(&delta, &cgrp->last_bstat);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) 		cgroup_base_stat_add(&parent->bstat, &delta);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) 		cgroup_base_stat_add(&cgrp->last_bstat, &delta);
^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) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) static struct cgroup_rstat_cpu *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) cgroup_base_stat_cputime_account_begin(struct cgroup *cgrp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) 	struct cgroup_rstat_cpu *rstatc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) 	rstatc = get_cpu_ptr(cgrp->rstat_cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) 	u64_stats_update_begin(&rstatc->bsync);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) 	return rstatc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) static void cgroup_base_stat_cputime_account_end(struct cgroup *cgrp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) 						 struct cgroup_rstat_cpu *rstatc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) 	u64_stats_update_end(&rstatc->bsync);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) 	cgroup_rstat_updated(cgrp, smp_processor_id());
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) 	put_cpu_ptr(rstatc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) void __cgroup_account_cputime(struct cgroup *cgrp, u64 delta_exec)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) 	struct cgroup_rstat_cpu *rstatc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) 	rstatc = cgroup_base_stat_cputime_account_begin(cgrp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) 	rstatc->bstat.cputime.sum_exec_runtime += delta_exec;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) 	cgroup_base_stat_cputime_account_end(cgrp, rstatc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) void __cgroup_account_cputime_field(struct cgroup *cgrp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) 				    enum cpu_usage_stat index, u64 delta_exec)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) 	struct cgroup_rstat_cpu *rstatc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) 	rstatc = cgroup_base_stat_cputime_account_begin(cgrp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) 	switch (index) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) 	case CPUTIME_USER:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) 	case CPUTIME_NICE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) 		rstatc->bstat.cputime.utime += delta_exec;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) 	case CPUTIME_SYSTEM:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) 	case CPUTIME_IRQ:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) 	case CPUTIME_SOFTIRQ:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) 		rstatc->bstat.cputime.stime += delta_exec;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) 	default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) 	cgroup_base_stat_cputime_account_end(cgrp, rstatc);
^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) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392)  * compute the cputime for the root cgroup by getting the per cpu data
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393)  * at a global level, then categorizing the fields in a manner consistent
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394)  * with how it is done by __cgroup_account_cputime_field for each bit of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395)  * cpu time attributed to a cgroup.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) static void root_cgroup_cputime(struct task_cputime *cputime)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) 	int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) 	cputime->stime = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) 	cputime->utime = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) 	cputime->sum_exec_runtime = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) 	for_each_possible_cpu(i) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) 		struct kernel_cpustat kcpustat;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) 		u64 *cpustat = kcpustat.cpustat;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) 		u64 user = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) 		u64 sys = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) 		kcpustat_cpu_fetch(&kcpustat, i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) 		user += cpustat[CPUTIME_USER];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) 		user += cpustat[CPUTIME_NICE];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) 		cputime->utime += user;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) 		sys += cpustat[CPUTIME_SYSTEM];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) 		sys += cpustat[CPUTIME_IRQ];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) 		sys += cpustat[CPUTIME_SOFTIRQ];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) 		cputime->stime += sys;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) 		cputime->sum_exec_runtime += user;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) 		cputime->sum_exec_runtime += sys;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) 		cputime->sum_exec_runtime += cpustat[CPUTIME_STEAL];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) void cgroup_base_stat_cputime_show(struct seq_file *seq)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) 	struct cgroup *cgrp = seq_css(seq)->cgroup;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) 	u64 usage, utime, stime;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) 	struct task_cputime cputime;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) 	if (cgroup_parent(cgrp)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) 		cgroup_rstat_flush_hold(cgrp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) 		usage = cgrp->bstat.cputime.sum_exec_runtime;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) 		cputime_adjust(&cgrp->bstat.cputime, &cgrp->prev_cputime,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) 			       &utime, &stime);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) 		cgroup_rstat_flush_release();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) 		root_cgroup_cputime(&cputime);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) 		usage = cputime.sum_exec_runtime;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) 		utime = cputime.utime;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) 		stime = cputime.stime;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) 	do_div(usage, NSEC_PER_USEC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) 	do_div(utime, NSEC_PER_USEC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) 	do_div(stime, NSEC_PER_USEC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) 	seq_printf(seq, "usage_usec %llu\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) 		   "user_usec %llu\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) 		   "system_usec %llu\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) 		   usage, utime, stime);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) }