1 files changed, 0 insertions, 338 deletions
diff --git a/kernel/cgroup/stat.c b/kernel/cgroup/stat.c
deleted file mode 100644
index 1e111dd455c4..000000000000
--- a/kernel/cgroup/stat.c
+++ /dev/null
@@ -1,338 +0,0 @@
-#include "cgroup-internal.h"
-
-#include <linux/sched/cputime.h>
-
-static DEFINE_MUTEX(cgroup_stat_mutex);
-static DEFINE_PER_CPU(raw_spinlock_t, cgroup_cpu_stat_lock);
-
-static struct cgroup_cpu_stat *cgroup_cpu_stat(struct cgroup *cgrp, int cpu)
-{
-	return per_cpu_ptr(cgrp->cpu_stat, cpu);
-}
-
-/**
- * cgroup_cpu_stat_updated - keep track of updated cpu_stat
- * @cgrp: target cgroup
- * @cpu: cpu on which cpu_stat was updated
- *
- * @cgrp's cpu_stat on @cpu was updated.  Put it on the parent's matching
- * cpu_stat->updated_children list.  See the comment on top of
- * cgroup_cpu_stat definition for details.
- */
-static void cgroup_cpu_stat_updated(struct cgroup *cgrp, int cpu)
-{
-	raw_spinlock_t *cpu_lock = per_cpu_ptr(&cgroup_cpu_stat_lock, cpu);
-	struct cgroup *parent;
-	unsigned long flags;
-
-	/*
-	 * Speculative already-on-list test.  This may race leading to
-	 * temporary inaccuracies, which is fine.
-	 *
-	 * Because @parent's updated_children is terminated with @parent
-	 * instead of NULL, we can tell whether @cgrp is on the list by
-	 * testing the next pointer for NULL.
-	 */
-	if (cgroup_cpu_stat(cgrp, cpu)->updated_next)
-		return;
-
-	raw_spin_lock_irqsave(cpu_lock, flags);
-
-	/* put @cgrp and all ancestors on the corresponding updated lists */
-	for (parent = cgroup_parent(cgrp); parent;
-	     cgrp = parent, parent = cgroup_parent(cgrp)) {
-		struct cgroup_cpu_stat *cstat = cgroup_cpu_stat(cgrp, cpu);
-		struct cgroup_cpu_stat *pcstat = cgroup_cpu_stat(parent, cpu);
-
-		/*
-		 * Both additions and removals are bottom-up.  If a cgroup
-		 * is already in the tree, all ancestors are.
-		 */
-		if (cstat->updated_next)
-			break;
-
-		cstat->updated_next = pcstat->updated_children;
-		pcstat->updated_children = cgrp;
-	}
-
-	raw_spin_unlock_irqrestore(cpu_lock, flags);
-}
-
-/**
- * cgroup_cpu_stat_pop_updated - iterate and dismantle cpu_stat updated tree
- * @pos: current position
- * @root: root of the tree to traversal
- * @cpu: target cpu
- *
- * Walks the udpated cpu_stat tree on @cpu from @root.  %NULL @pos starts
- * the traversal and %NULL return indicates the end.  During traversal,
- * each returned cgroup is unlinked from the tree.  Must be called with the
- * matching cgroup_cpu_stat_lock held.
- *
- * The only ordering guarantee is that, for a parent and a child pair
- * covered by a given traversal, if a child is visited, its parent is
- * guaranteed to be visited afterwards.
- */
-static struct cgroup *cgroup_cpu_stat_pop_updated(struct cgroup *pos,
-						  struct cgroup *root, int cpu)
-{
-	struct cgroup_cpu_stat *cstat;
-	struct cgroup *parent;
-
-	if (pos == root)
-		return NULL;
-
-	/*
-	 * We're gonna walk down to the first leaf and visit/remove it.  We
-	 * can pick whatever unvisited node as the starting point.
-	 */
-	if (!pos)
-		pos = root;
-	else
-		pos = cgroup_parent(pos);
-
-	/* walk down to the first leaf */
-	while (true) {
-		cstat = cgroup_cpu_stat(pos, cpu);
-		if (cstat->updated_children == pos)
-			break;
-		pos = cstat->updated_children;
-	}
-
-	/*
-	 * Unlink @pos from the tree.  As the updated_children list is
-	 * singly linked, we have to walk it to find the removal point.
-	 * However, due to the way we traverse, @pos will be the first
-	 * child in most cases. The only exception is @root.
-	 */
-	parent = cgroup_parent(pos);
-	if (parent && cstat->updated_next) {
-		struct cgroup_cpu_stat *pcstat = cgroup_cpu_stat(parent, cpu);
-		struct cgroup_cpu_stat *ncstat;
-		struct cgroup **nextp;
-
-		nextp = &pcstat->updated_children;
-		while (true) {
-			ncstat = cgroup_cpu_stat(*nextp, cpu);
-			if (*nextp == pos)
-				break;
-
-			WARN_ON_ONCE(*nextp == parent);
-			nextp = &ncstat->updated_next;
-		}
-
-		*nextp = cstat->updated_next;
-		cstat->updated_next = NULL;
-	}
-
-	return pos;
-}
-
-static void cgroup_stat_accumulate(struct cgroup_stat *dst_stat,
-				   struct cgroup_stat *src_stat)
-{
-	dst_stat->cputime.utime += src_stat->cputime.utime;
-	dst_stat->cputime.stime += src_stat->cputime.stime;
-	dst_stat->cputime.sum_exec_runtime += src_stat->cputime.sum_exec_runtime;
-}
-
-static void cgroup_cpu_stat_flush_one(struct cgroup *cgrp, int cpu)
-{
-	struct cgroup *parent = cgroup_parent(cgrp);
-	struct cgroup_cpu_stat *cstat = cgroup_cpu_stat(cgrp, cpu);
-	struct task_cputime *last_cputime = &cstat->last_cputime;
-	struct task_cputime cputime;
-	struct cgroup_stat delta;
-	unsigned seq;
-
-	lockdep_assert_held(&cgroup_stat_mutex);
-
-	/* fetch the current per-cpu values */
-	do {
-		seq = __u64_stats_fetch_begin(&cstat->sync);
-		cputime = cstat->cputime;
-	} while (__u64_stats_fetch_retry(&cstat->sync, seq));
-
-	/* accumulate the deltas to propgate */
-	delta.cputime.utime = cputime.utime - last_cputime->utime;
-	delta.cputime.stime = cputime.stime - last_cputime->stime;
-	delta.cputime.sum_exec_runtime = cputime.sum_exec_runtime -
-					 last_cputime->sum_exec_runtime;
-	*last_cputime = cputime;
-
-	/* transfer the pending stat into delta */
-	cgroup_stat_accumulate(&delta, &cgrp->pending_stat);
-	memset(&cgrp->pending_stat, 0, sizeof(cgrp->pending_stat));
-
-	/* propagate delta into the global stat and the parent's pending */
-	cgroup_stat_accumulate(&cgrp->stat, &delta);
-	if (parent)
-		cgroup_stat_accumulate(&parent->pending_stat, &delta);
-}
-
-/* see cgroup_stat_flush() */
-static void cgroup_stat_flush_locked(struct cgroup *cgrp)
-{
-	int cpu;
-
-	lockdep_assert_held(&cgroup_stat_mutex);
-
-	for_each_possible_cpu(cpu) {
-		raw_spinlock_t *cpu_lock = per_cpu_ptr(&cgroup_cpu_stat_lock, cpu);
-		struct cgroup *pos = NULL;
-
-		raw_spin_lock_irq(cpu_lock);
-		while ((pos = cgroup_cpu_stat_pop_updated(pos, cgrp, cpu)))
-			cgroup_cpu_stat_flush_one(pos, cpu);
-		raw_spin_unlock_irq(cpu_lock);
-	}
-}
-
-/**
- * cgroup_stat_flush - flush stats in @cgrp's subtree
- * @cgrp: target cgroup
- *
- * Collect all per-cpu stats in @cgrp's subtree into the global counters
- * and propagate them upwards.  After this function returns, all cgroups in
- * the subtree have up-to-date ->stat.
- *
- * This also gets all cgroups in the subtree including @cgrp off the
- * ->updated_children lists.
- */
-void cgroup_stat_flush(struct cgroup *cgrp)
-{
-	mutex_lock(&cgroup_stat_mutex);
-	cgroup_stat_flush_locked(cgrp);
-	mutex_unlock(&cgroup_stat_mutex);
-}
-
-static struct cgroup_cpu_stat *cgroup_cpu_stat_account_begin(struct cgroup *cgrp)
-{
-	struct cgroup_cpu_stat *cstat;
-
-	cstat = get_cpu_ptr(cgrp->cpu_stat);
-	u64_stats_update_begin(&cstat->sync);
-	return cstat;
-}
-
-static void cgroup_cpu_stat_account_end(struct cgroup *cgrp,
-					struct cgroup_cpu_stat *cstat)
-{
-	u64_stats_update_end(&cstat->sync);
-	cgroup_cpu_stat_updated(cgrp, smp_processor_id());
-	put_cpu_ptr(cstat);
-}
-
-void __cgroup_account_cputime(struct cgroup *cgrp, u64 delta_exec)
-{
-	struct cgroup_cpu_stat *cstat;
-
-	cstat = cgroup_cpu_stat_account_begin(cgrp);
-	cstat->cputime.sum_exec_runtime += delta_exec;
-	cgroup_cpu_stat_account_end(cgrp, cstat);
-}
-
-void __cgroup_account_cputime_field(struct cgroup *cgrp,
-				    enum cpu_usage_stat index, u64 delta_exec)
-{
-	struct cgroup_cpu_stat *cstat;
-
-	cstat = cgroup_cpu_stat_account_begin(cgrp);
-
-	switch (index) {
-	case CPUTIME_USER:
-	case CPUTIME_NICE:
-		cstat->cputime.utime += delta_exec;
-		break;
-	case CPUTIME_SYSTEM:
-	case CPUTIME_IRQ:
-	case CPUTIME_SOFTIRQ:
-		cstat->cputime.stime += delta_exec;
-		break;
-	default:
-		break;
-	}
-
-	cgroup_cpu_stat_account_end(cgrp, cstat);
-}
-
-void cgroup_stat_show_cputime(struct seq_file *seq)
-{
-	struct cgroup *cgrp = seq_css(seq)->cgroup;
-	u64 usage, utime, stime;
-
-	if (!cgroup_parent(cgrp))
-		return;
-
-	mutex_lock(&cgroup_stat_mutex);
-
-	cgroup_stat_flush_locked(cgrp);
-
-	usage = cgrp->stat.cputime.sum_exec_runtime;
-	cputime_adjust(&cgrp->stat.cputime, &cgrp->stat.prev_cputime,
-		       &utime, &stime);
-
-	mutex_unlock(&cgroup_stat_mutex);
-
-	do_div(usage, NSEC_PER_USEC);
-	do_div(utime, NSEC_PER_USEC);
-	do_div(stime, NSEC_PER_USEC);
-
-	seq_printf(seq, "usage_usec %llu\n"
-		   "user_usec %llu\n"
-		   "system_usec %llu\n",
-		   usage, utime, stime);
-}
-
-int cgroup_stat_init(struct cgroup *cgrp)
-{
-	int cpu;
-
-	/* the root cgrp has cpu_stat preallocated */
-	if (!cgrp->cpu_stat) {
-		cgrp->cpu_stat = alloc_percpu(struct cgroup_cpu_stat);
-		if (!cgrp->cpu_stat)
-			return -ENOMEM;
-	}
-
-	/* ->updated_children list is self terminated */
-	for_each_possible_cpu(cpu) {
-		struct cgroup_cpu_stat *cstat = cgroup_cpu_stat(cgrp, cpu);
-
-		cstat->updated_children = cgrp;
-		u64_stats_init(&cstat->sync);
-	}
-
-	prev_cputime_init(&cgrp->stat.prev_cputime);
-
-	return 0;
-}
-
-void cgroup_stat_exit(struct cgroup *cgrp)
-{
-	int cpu;
-
-	cgroup_stat_flush(cgrp);
-
-	/* sanity check */
-	for_each_possible_cpu(cpu) {
-		struct cgroup_cpu_stat *cstat = cgroup_cpu_stat(cgrp, cpu);
-
-		if (WARN_ON_ONCE(cstat->updated_children != cgrp) ||
-		    WARN_ON_ONCE(cstat->updated_next))
-			return;
-	}
-
-	free_percpu(cgrp->cpu_stat);
-	cgrp->cpu_stat = NULL;
-}
-
-void __init cgroup_stat_boot(void)
-{
-	int cpu;
-
-	for_each_possible_cpu(cpu)
-		raw_spin_lock_init(per_cpu_ptr(&cgroup_cpu_stat_lock, cpu));
-
-	BUG_ON(cgroup_stat_init(&cgrp_dfl_root.cgrp));
-}