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perf: Fix hw breakpoints overflow period sampling

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The hw breakpoint pmu 'add' function is missing the
period_left update needed for SW events.

The perf HW breakpoint events use the SW events framework
to process the overflow, so it needs to be properly initialized
in the PMU 'add' method.

Signed-off-by: Jiri Olsa <[email protected]>
Reviewed-by: Peter Zijlstra <[email protected]>
Cc: H. Peter Anvin <[email protected]>
Cc: Oleg Nesterov <[email protected]>
Cc: Arnaldo Carvalho de Melo <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Paul Mackerras <[email protected]>
Cc: Corey Ashford <[email protected]>
Cc: Frederic Weisbecker <[email protected]>
Cc: Vince Weaver <[email protected]>
Cc: Stephane Eranian <[email protected]>
Signed-off-by: Peter Zijlstra <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>
This commit is contained in:
Jiri Olsa 2013-05-01 17:25:44 +02:00 • committed by Ingo Molnar
commit ab573844e3
3 changed files with 8 additions and 1 deletions
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2
kernel/events/core.c
View file

@ -4961,7 +4961,7 @@ static DEFINE_PER_CPU(struct swevent_htable, swevent_htable);
* sign as trigger.
*/
static u64 perf_swevent_set_period(struct perf_event *event)
u64 perf_swevent_set_period(struct perf_event *event)
{
struct hw_perf_event *hwc = &event->hw;
u64 period = hwc->last_period;

5
kernel/events/hw_breakpoint.c
View file

@ -612,6 +612,11 @@ static int hw_breakpoint_add(struct perf_event *bp, int flags)
if (!(flags & PERF_EF_START))
bp->hw.state = PERF_HES_STOPPED;
if (is_sampling_event(bp)) {
bp->hw.last_period = bp->hw.sample_period;
perf_swevent_set_period(bp);
}
return arch_install_hw_breakpoint(bp);
}