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cgroup: Reorganize kernel/cgroup/rstat.c 

Currently, rstat.c has rstat and base stat implementations intermixed.
Collect base stat implementation at the end of the file.  Also,
reorder the prototypes.

This patch doesn't make any functional changes.

Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Tejun Heo 2018-04-26 14:29:05 -07:00
parent d4ff749b5e
commit a17556f8d9
2 changed files with 95 additions and 89 deletions
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2
kernel/cgroup/cgroup-internal.h
View File

@ -206,8 +206,8 @@ int cgroup_task_count(const struct cgroup *cgrp);
void cgroup_rstat_flush(struct cgroup *cgrp);
int cgroup_rstat_init(struct cgroup *cgrp);
void cgroup_rstat_exit(struct cgroup *cgrp);
void cgroup_base_stat_cputime_show(struct seq_file *seq);
void cgroup_rstat_boot(void);
void cgroup_base_stat_cputime_show(struct seq_file *seq);
/*
* namespace.c

182
kernel/cgroup/rstat.c
View File

@ -5,6 +5,8 @@
static DEFINE_MUTEX(cgroup_rstat_mutex);
static DEFINE_PER_CPU(raw_spinlock_t, cgroup_rstat_cpu_lock);
static void cgroup_base_stat_flush(struct cgroup *cgrp, int cpu);
static struct cgroup_rstat_cpu *cgroup_rstat_cpu(struct cgroup *cgrp, int cpu)
{
return per_cpu_ptr(cgrp->rstat_cpu, cpu);
@ -128,6 +130,98 @@ static struct cgroup *cgroup_rstat_cpu_pop_updated(struct cgroup *pos,
return pos;
}
/* see cgroup_rstat_flush() */
static void cgroup_rstat_flush_locked(struct cgroup *cgrp)
{
int cpu;
lockdep_assert_held(&cgroup_rstat_mutex);
for_each_possible_cpu(cpu) {
raw_spinlock_t *cpu_lock = per_cpu_ptr(&cgroup_rstat_cpu_lock,
cpu);
struct cgroup *pos = NULL;
raw_spin_lock_irq(cpu_lock);
while ((pos = cgroup_rstat_cpu_pop_updated(pos, cgrp, cpu)))
cgroup_base_stat_flush(pos, cpu);
raw_spin_unlock_irq(cpu_lock);
}
}
/**
* cgroup_rstat_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_rstat_flush(struct cgroup *cgrp)
{
mutex_lock(&cgroup_rstat_mutex);
cgroup_rstat_flush_locked(cgrp);
mutex_unlock(&cgroup_rstat_mutex);
}
int cgroup_rstat_init(struct cgroup *cgrp)
{
int cpu;
/* the root cgrp has rstat_cpu preallocated */
if (!cgrp->rstat_cpu) {
cgrp->rstat_cpu = alloc_percpu(struct cgroup_rstat_cpu);
if (!cgrp->rstat_cpu)
return -ENOMEM;
}
/* ->updated_children list is self terminated */
for_each_possible_cpu(cpu) {
struct cgroup_rstat_cpu *rstatc = cgroup_rstat_cpu(cgrp, cpu);
rstatc->updated_children = cgrp;
u64_stats_init(&rstatc->bsync);
}
return 0;
}
void cgroup_rstat_exit(struct cgroup *cgrp)
{
int cpu;
cgroup_rstat_flush(cgrp);
/* sanity check */
for_each_possible_cpu(cpu) {
struct cgroup_rstat_cpu *rstatc = cgroup_rstat_cpu(cgrp, cpu);
if (WARN_ON_ONCE(rstatc->updated_children != cgrp) ||
WARN_ON_ONCE(rstatc->updated_next))
return;
}
free_percpu(cgrp->rstat_cpu);
cgrp->rstat_cpu = NULL;
}
void __init cgroup_rstat_boot(void)
{
int cpu;
for_each_possible_cpu(cpu)
raw_spin_lock_init(per_cpu_ptr(&cgroup_rstat_cpu_lock, cpu));
BUG_ON(cgroup_rstat_init(&cgrp_dfl_root.cgrp));
}
/*
* Functions for cgroup basic resource statistics implemented on top of
* rstat.
*/
static void cgroup_base_stat_accumulate(struct cgroup_base_stat *dst_bstat,
struct cgroup_base_stat *src_bstat)
{
@ -170,43 +264,6 @@ static void cgroup_base_stat_flush(struct cgroup *cgrp, int cpu)
cgroup_base_stat_accumulate(&parent->pending_bstat, &delta);
}
/* see cgroup_rstat_flush() */
static void cgroup_rstat_flush_locked(struct cgroup *cgrp)
{
int cpu;
lockdep_assert_held(&cgroup_rstat_mutex);
for_each_possible_cpu(cpu) {
raw_spinlock_t *cpu_lock = per_cpu_ptr(&cgroup_rstat_cpu_lock,
cpu);
struct cgroup *pos = NULL;
raw_spin_lock_irq(cpu_lock);
while ((pos = cgroup_rstat_cpu_pop_updated(pos, cgrp, cpu)))
cgroup_base_stat_flush(pos, cpu);
raw_spin_unlock_irq(cpu_lock);
}
}
/**
* cgroup_rstat_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_rstat_flush(struct cgroup *cgrp)
{
mutex_lock(&cgroup_rstat_mutex);
cgroup_rstat_flush_locked(cgrp);
mutex_unlock(&cgroup_rstat_mutex);
}
static struct cgroup_rstat_cpu *
cgroup_base_stat_cputime_account_begin(struct cgroup *cgrp)
{
@ -284,54 +341,3 @@ void cgroup_base_stat_cputime_show(struct seq_file *seq)
"system_usec %llu\n",
usage, utime, stime);
}
int cgroup_rstat_init(struct cgroup *cgrp)
{
int cpu;
/* the root cgrp has rstat_cpu preallocated */
if (!cgrp->rstat_cpu) {
cgrp->rstat_cpu = alloc_percpu(struct cgroup_rstat_cpu);
if (!cgrp->rstat_cpu)
return -ENOMEM;
}
/* ->updated_children list is self terminated */
for_each_possible_cpu(cpu) {
struct cgroup_rstat_cpu *rstatc = cgroup_rstat_cpu(cgrp, cpu);
rstatc->updated_children = cgrp;
u64_stats_init(&rstatc->bsync);
}
return 0;
}
void cgroup_rstat_exit(struct cgroup *cgrp)
{
int cpu;
cgroup_rstat_flush(cgrp);
/* sanity check */
for_each_possible_cpu(cpu) {
struct cgroup_rstat_cpu *rstatc = cgroup_rstat_cpu(cgrp, cpu);
if (WARN_ON_ONCE(rstatc->updated_children != cgrp) ||
WARN_ON_ONCE(rstatc->updated_next))
return;
}
free_percpu(cgrp->rstat_cpu);
cgrp->rstat_cpu = NULL;
}
void __init cgroup_rstat_boot(void)
{
int cpu;
for_each_possible_cpu(cpu)
raw_spin_lock_init(per_cpu_ptr(&cgroup_rstat_cpu_lock, cpu));
BUG_ON(cgroup_rstat_init(&cgrp_dfl_root.cgrp));
}