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perf: Simplify perf_event_exit_task_context()

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Instead of jumping through hoops to make sure to find (and exit) each
event, do it the simple straight fwd way.

Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Vince Weaver <vincent.weaver@maine.edu>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/n/tip-tij931199thfkys8vbnokdpf@git.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Peter Zijlstra 2014-05-05 12:42:29 +02:00 committed by Ingo Molnar
parent 683ede43dd
commit 3a497f4863
1 changed files with 1 additions and 16 deletions
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17
kernel/events/core.c
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@ -7485,24 +7485,9 @@ static void perf_event_exit_task_context(struct task_struct *child, int ctxn)
*/
mutex_lock(&child_ctx->mutex);
again:
list_for_each_entry_safe(child_event, tmp, &child_ctx->pinned_groups,
group_entry)
list_for_each_entry_rcu(child_event, &child_ctx->event_list, event_entry)
__perf_event_exit_task(child_event, child_ctx, child);
list_for_each_entry_safe(child_event, tmp, &child_ctx->flexible_groups,
group_entry)
__perf_event_exit_task(child_event, child_ctx, child);
/*
* If the last event was a group event, it will have appended all
* its siblings to the list, but we obtained 'tmp' before that which
* will still point to the list head terminating the iteration.
*/
if (!list_empty(&child_ctx->pinned_groups) ||
!list_empty(&child_ctx->flexible_groups))
goto again;
mutex_unlock(&child_ctx->mutex);
put_ctx(child_ctx);