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perf/core: Use perf_cgroup_info->active to check if cgroup is active

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Since we use perf_cgroup_set_timestamp() to start cgroup time and
set active to 1, then use update_cgrp_time_from_cpuctx() to stop
cgroup time and set active to 0.

We can use info->active directly to check if cgroup is active.

Signed-off-by: Chengming Zhou <zhouchengming@bytedance.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20220329154523.86438-3-zhouchengming@bytedance.com
This commit is contained in:
Chengming Zhou 2022-03-29 23:45:21 +08:00 committed by Peter Zijlstra
parent a0827713e2
commit 6875186aea
1 changed files with 2 additions and 5 deletions
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7
kernel/events/core.c
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@ -780,7 +780,6 @@ static inline void update_cgrp_time_from_cpuctx(struct perf_cpu_context *cpuctx,
static inline void update_cgrp_time_from_event(struct perf_event *event)
{
struct perf_cgroup_info *info;
struct perf_cgroup *cgrp;
/*
* ensure we access cgroup data only when needed and
@ -789,14 +788,12 @@ static inline void update_cgrp_time_from_event(struct perf_event *event)
if (!is_cgroup_event(event))
return;
cgrp = perf_cgroup_from_task(current, event->ctx);
info = this_cpu_ptr(event->cgrp->info);
/*
* Do not update time when cgroup is not active
*/
if (cgroup_is_descendant(cgrp->css.cgroup, event->cgrp->css.cgroup)) {
info = this_cpu_ptr(event->cgrp->info);
if (info->active)
__update_cgrp_time(info, perf_clock(), true);
}
}
static inline void