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- Fix "same task" check when redirecting event output

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- Do not wait unconditionally for RCU on the event migration path if
   there are no events to migrate
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Merge tag 'perf_urgent_for_v6.3_rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull perf fixes from Borislav Petkov:

 - Fix "same task" check when redirecting event output

 - Do not wait unconditionally for RCU on the event migration path if
   there are no events to migrate

* tag 'perf_urgent_for_v6.3_rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  perf/core: Fix the same task check in perf_event_set_output
  perf: Optimize perf_pmu_migrate_context()
This commit is contained in:
Linus Torvalds 2023-04-09 10:10:46 -07:00
commit faf8f41858
1 changed files with 8 additions and 6 deletions
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14
kernel/events/core.c
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@ -12173,7 +12173,7 @@ perf_event_set_output(struct perf_event *event, struct perf_event *output_event)
/*
* If its not a per-cpu rb, it must be the same task.
*/
if (output_event->cpu == -1 && output_event->ctx != event->ctx)
if (output_event->cpu == -1 && output_event->hw.target != event->hw.target)
goto out;
/*
@ -12893,12 +12893,14 @@ void perf_pmu_migrate_context(struct pmu *pmu, int src_cpu, int dst_cpu)
__perf_pmu_remove(src_ctx, src_cpu, pmu, &src_ctx->pinned_groups, &events);
__perf_pmu_remove(src_ctx, src_cpu, pmu, &src_ctx->flexible_groups, &events);
/*
* Wait for the events to quiesce before re-instating them.
*/
synchronize_rcu();
if (!list_empty(&events)) {
/*
* Wait for the events to quiesce before re-instating them.
*/
synchronize_rcu();
__perf_pmu_install(dst_ctx, dst_cpu, pmu, &events);
__perf_pmu_install(dst_ctx, dst_cpu, pmu, &events);
}
mutex_unlock(&dst_ctx->mutex);
mutex_unlock(&src_ctx->mutex);