Commit a86ed508 authored Dec 17, 2008 by Ingo Molnar

perfcounters: use hw_event.disable flag



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>

parent f65cb45c

kernel/perf_counter.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -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);