linux-kernel - [PATCH v4 0/4] perf/core: Fixes for cgroup events

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Date:   Tue, 29 Mar 2022 23:45:19 +0800
From:   Chengming Zhou <zhouchengming@...edance.com>
To:     peterz@...radead.org, mingo@...hat.com, acme@...nel.org,
        mark.rutland@....com, alexander.shishkin@...ux.intel.com,
        jolsa@...nel.org, namhyung@...nel.org, eranian@...gle.com
Cc:     linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
        duanxiongchun@...edance.com, songmuchun@...edance.com,
        Chengming Zhou <zhouchengming@...edance.com>
Subject: [PATCH v4 0/4] perf/core: Fixes for cgroup events

Hi,

This patchset mainly fix a race problem between cgroup_migrate_execute()
and perf_cgroup_sched_out/in().

v4:
 - delete patch 3 in v3 that remove event_filter_match() in
   merge_sched_in(), which is wrong since the hybrid system
   implemented PMU specific filter_match callback. Thanks Kan.

v3:
 - put two fix patches together in patch 4
 - delete percpu cpu_perf_cgroup, just use cpuctx->cgrp to compare
 - reorganize these patches' order

v2:
 - split into two patches to fix the race problem for easier review
 - use cpuctx->cgrp when start ctx time and delete unused task argument
 - use cpuctx->cgrp when update ctx time from cgroup perf_event
 - always set cpuctx->cgrp when the first cgroup event enabled
 - remove obselete comments

v1:
 - https://lore.kernel.org/lkml/20220308135948.55336-1-zhouchengming@bytedance.com/


Chengming Zhou (4):
  perf/core: Don't pass task around when ctx sched in
  perf/core: Use perf_cgroup_info->active to check if cgroup is active
  perf/core: Fix perf_cgroup_switch()
  perf/core: Always set cpuctx cgrp when enable cgroup event

 kernel/events/core.c | 209 +++++++++++--------------------------------
 1 file changed, 52 insertions(+), 157 deletions(-)

-- 
2.35.1