Moving event state initialization before the pmu->del
and behind the pmu->add call.
This way the toggler can refer to event->state and
make sure the event is really scheduled before
calling pmu->stop/start in case we get interrupted
inside event_sched_in/event_sched_out functions.
Original-patch-by: Frederic Weisbecker <fweis...@gmail.com>
Signed-off-by: Jiri Olsa <jo...@redhat.com>
Signed-off-by: Frederic Weisbecker <fweis...@gmail.com>
Cc: Arnaldo Carvalho de Melo <a...@redhat.com>
Cc: Corey Ashford <cjash...@linux.vnet.ibm.com>
Cc: Frederic Weisbecker <fweis...@gmail.com>
Cc: Ingo Molnar <mi...@elte.hu>
Cc: Paul Mackerras <pau...@samba.org>
Cc: Peter Zijlstra <a.p.zijls...@chello.nl>
Cc: Arnaldo Carvalho de Melo <a...@redhat.com>
---
kernel/events/core.c | 14 ++++++++------
1 file changed, 8 insertions(+), 6 deletions(-)
diff --git a/kernel/events/core.c b/kernel/events/core.c
index dd236b6..e8674e4 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -1388,14 +1388,16 @@ event_sched_out(struct perf_event *event,
if (event->state != PERF_EVENT_STATE_ACTIVE)
return;
+ event->tstamp_stopped = tstamp;
+ event->oncpu = -1;
event->state = PERF_EVENT_STATE_INACTIVE;
+
+ event->pmu->del(event, 0);
+
if (event->pending_disable) {
event->pending_disable = 0;
event->state = PERF_EVENT_STATE_OFF;
}
- event->tstamp_stopped = tstamp;
- event->pmu->del(event, 0);
- event->oncpu = -1;
if (!is_software_event(event))
cpuctx->active_oncpu--;
@@ -1648,9 +1650,6 @@ event_sched_in(struct perf_event *event,
if (event->state <= PERF_EVENT_STATE_OFF)
return 0;
- event->state = PERF_EVENT_STATE_ACTIVE;
- event->oncpu = smp_processor_id();
-
/*
* Unthrottle events, since we scheduled we might have missed several
* ticks already, also for a heavily scheduling task there is little
@@ -1672,6 +1671,9 @@ event_sched_in(struct perf_event *event,
return -EAGAIN;
}
+ event->state = PERF_EVENT_STATE_ACTIVE;
+ event->oncpu = smp_processor_id();
+
event->tstamp_running += tstamp - event->tstamp_stopped;
perf_set_shadow_time(event, ctx, tstamp);
--
1.7.11.7
--
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