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authorJiri Olsa <jolsa@redhat.com>2014-09-12 13:18:27 +0200
committerIngo Molnar <mingo@kernel.org>2014-09-24 14:48:12 +0200
commit1929def9e609d1a8cdb1626d85eda3da66921a7d (patch)
treeb564aab4275cbf01768860718f83691f05bf9af9 /kernel/events
parentdc633982ff3f4fd74cdc11b5a6ae53d39a0b2451 (diff)
perf: Fix child event initial state setup
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. Signed-off-by: Jiri Olsa <jolsa@kernel.org> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Stephane Eranian <eranian@google.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Arnaldo Carvalho de Melo <acme@kernel.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Link: http://lkml.kernel.org/r/1410520708-19275-2-git-send-email-jolsa@kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/events')
-rw-r--r--kernel/events/core.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/kernel/events/core.c b/kernel/events/core.c
index 15e58d4ea035..132524c8b340 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -7818,6 +7818,7 @@ 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;
@@ -7851,7 +7852,7 @@ 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;