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>
diff --git a/kernel/perf_counter.c b/kernel/perf_counter.c
index 16396e9..5431e79 100644
--- a/kernel/perf_counter.c
+++ b/kernel/perf_counter.c
@@ -1093,6 +1093,9 @@
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);