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cgroup: rstat: retrieve current bstat to delta directly

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Instead of retrieve current bstat to cur and copy it to delta, let's use
delta directly.

This saves one copy operation and has the same code convention as
propagating delta to parent.

Signed-off-by: Wei Yang <richard.weiyang@gmail.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Wei Yang 2022-01-08 00:38:17 +00:00 committed by Tejun Heo
parent 4148be7de0
commit 95b99f353c
1 changed files with 2 additions and 3 deletions
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5
kernel/cgroup/rstat.c
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@ -315,7 +315,7 @@ static void cgroup_base_stat_flush(struct cgroup *cgrp, int cpu)
{
struct cgroup_rstat_cpu *rstatc = cgroup_rstat_cpu(cgrp, cpu);
struct cgroup *parent = cgroup_parent(cgrp);
struct cgroup_base_stat cur, delta;
struct cgroup_base_stat delta;
unsigned seq;
/* Root-level stats are sourced from system-wide CPU stats */
@ -325,11 +325,10 @@ static void cgroup_base_stat_flush(struct cgroup *cgrp, int cpu)
/* fetch the current per-cpu values */
do {
seq = __u64_stats_fetch_begin(&rstatc->bsync);
cur = rstatc->bstat;
delta = rstatc->bstat;
} while (__u64_stats_fetch_retry(&rstatc->bsync, seq));
/* propagate percpu delta to global */
delta = cur;
cgroup_base_stat_sub(&delta, &rstatc->last_bstat);
cgroup_base_stat_add(&cgrp->bstat, &delta);
cgroup_base_stat_add(&rstatc->last_bstat, &delta);