From: Jiri Olsa <[email protected]> Currently we initialize the child event based on the original parent state. This is wrong, because the original parent event (and its state) is not related to current fork and also could be already gone.
We need to initialize the child state based on the immediate parent event state. Cc: Arnaldo Carvalho de Melo <[email protected]> Cc: Frederic Weisbecker <[email protected]> Cc: Ingo Molnar <[email protected]> Cc: Paul Mackerras <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: Stephane Eranian <[email protected]> Signed-off-by: Jiri Olsa <[email protected]> --- kernel/events/core.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/kernel/events/core.c b/kernel/events/core.c index cf779eaaf624..5a09a09b2983 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -7798,6 +7798,7 @@ inherit_event(struct perf_event *parent_event, struct perf_event *group_leader, struct perf_event_context *child_ctx) { + enum perf_event_active_state parent_state = parent_event->state; struct perf_event *child_event; unsigned long flags; @@ -7831,7 +7832,7 @@ inherit_event(struct perf_event *parent_event, * not its attr.disabled bit. We hold the parent's mutex, * so we won't race with perf_event_{en, dis}able_family. */ - if (parent_event->state >= PERF_EVENT_STATE_INACTIVE) + if (parent_state >= PERF_EVENT_STATE_INACTIVE) child_event->state = PERF_EVENT_STATE_INACTIVE; else child_event->state = PERF_EVENT_STATE_OFF; -- 1.8.3.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
