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perfcounters: use hw_event.disable flag

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Impact: implement default-off counters

Make sure that counters that are created with counter.hw_event.disabled=1,
get created in disabled state.

They can be enabled via:

        prctl(PR_TASK_PERF_COUNTERS_ENABLE);

Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Ingo Molnar 2008-12-17 00:43:10 +01:00
parent f65cb45cba
commit a86ed50859
1 changed files with 3 additions and 0 deletions
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3
kernel/perf_counter.c
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@ -1093,6 +1093,9 @@ perf_counter_alloc(struct perf_counter_hw_event *hw_event,
counter->group_leader = group_leader;
counter->hw_ops = NULL;
if (hw_event->disabled)
counter->state = PERF_COUNTER_STATE_OFF;
hw_ops = NULL;
if (!hw_event->raw && hw_event->type < 0)
hw_ops = sw_perf_counter_init(counter);