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perf: Add cpu isolation awareness

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Ensure perf events does not wake up idle cores when core is isolated.

Change-Id: Ifefb2f1cf6c24af7bc46fc62797955b8c8ad5815
Signed-off-by: Olav Haugan <ohaugan@codeaurora.org>
This commit is contained in:
Olav Haugan 2016-05-29 19:54:27 -07:00
parent e38c1ce123
commit 639c8ad52d
1 changed files with 2 additions and 1 deletions
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3
kernel/events/core.c
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@ -3386,7 +3386,8 @@ static int perf_event_read(struct perf_event *event, bool group)
* If event is enabled and currently active on a CPU, update the
* value in the event structure:
*/
if (event->state == PERF_EVENT_STATE_ACTIVE) {
if (event->state == PERF_EVENT_STATE_ACTIVE &&
!cpu_isolated(event->oncpu)) {
struct perf_read_data data = {
.event = event,
.group = group,