Hi,

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

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 (5):
  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: Don't need event_filter_match in merge_sched_in()
  perf/core: Fix perf_cgroup_switch()
  perf/core: Always set cpuctx cgrp when enable cgroup event

 kernel/events/core.c | 212 +++++++++++--------------------------------
 1 file changed, 52 insertions(+), 160 deletions(-)

-- 
2.20.1