Commit d76a0812 authored by Stephane Eranian's avatar Stephane Eranian Committed by Ingo Molnar
Browse files

perf_events: Add new start/stop PMU callbacks 



In certain situations, the kernel may need to stop and start the same
event rapidly. The current PMU callbacks do not distinguish between stop
and release (i.e., stop + free the resource). Thus, a counter may be
released, then it will be immediately re-acquired. Event scheduling will
again take place with no guarantee to assign the same counter. On some
processors, this may event yield to failure to assign the event back due
to competion between cores.

This patch is adding a new pair of callback to stop and restart a counter
without actually release the underlying counter resource. On stop, the
counter is stopped, its values saved and that's it. On start, the value
is reloaded and counter is restarted (on x86, actual restart is delayed
until perf_enable()).

Signed-off-by: default avatarStephane Eranian <eranian@google.com>
[ added fallback to ->enable/->disable for all other PMUs
  fixed x86_pmu_start() to call x86_pmu.enable()
  merged __x86_pmu_disable into x86_pmu_stop() ]
Signed-off-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <4b703875.0a04d00a.7896.ffffb824@mx.google.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 3a0304e9

arch/x86/kernel/cpu/perf_event.c

+20 −4
Original line number Diff line number Diff line
@@ -1495,7 +1495,7 @@ static inline int match_prev_assignment(struct hw_perf_event *hwc, 
		hwc->last_tag == cpuc->tags[i];

}



static void __x86_pmu_disable(struct perf_event *event, struct cpu_hw_events *cpuc);

static void x86_pmu_stop(struct perf_event *event);



void hw_perf_enable(void)

{
@@ -1533,7 +1533,7 @@ void hw_perf_enable(void) 
			    match_prev_assignment(hwc, cpuc, i))

				continue;



			__x86_pmu_disable(event, cpuc);

			x86_pmu_stop(event);



			hwc->idx = -1;

		}
@@ -1801,6 +1801,19 @@ static int x86_pmu_enable(struct perf_event *event) 
	return 0;

}



static int x86_pmu_start(struct perf_event *event)

{

	struct hw_perf_event *hwc = &event->hw;



	if (hwc->idx == -1)

		return -EAGAIN;



	x86_perf_event_set_period(event, hwc, hwc->idx);

	x86_pmu.enable(hwc, hwc->idx);



	return 0;

}



static void x86_pmu_unthrottle(struct perf_event *event)

{

	struct cpu_hw_events *cpuc = &__get_cpu_var(cpu_hw_events);
@@ -1924,8 +1937,9 @@ static void intel_pmu_drain_bts_buffer(struct cpu_hw_events *cpuc) 
	event->pending_kill = POLL_IN;

}



static void __x86_pmu_disable(struct perf_event *event, struct cpu_hw_events *cpuc)

static void x86_pmu_stop(struct perf_event *event)

{

	struct cpu_hw_events *cpuc = &__get_cpu_var(cpu_hw_events);

	struct hw_perf_event *hwc = &event->hw;

	int idx = hwc->idx;
@@ -1954,7 +1968,7 @@ static void x86_pmu_disable(struct perf_event *event) 
	struct cpu_hw_events *cpuc = &__get_cpu_var(cpu_hw_events);

	int i;



	__x86_pmu_disable(event, cpuc);

	x86_pmu_stop(event);



	for (i = 0; i < cpuc->n_events; i++) {

		if (event == cpuc->event_list[i]) {
@@ -2667,6 +2681,8 @@ static inline void x86_pmu_read(struct perf_event *event) 
static const struct pmu pmu = {

	.enable		= x86_pmu_enable,

	.disable	= x86_pmu_disable,

	.start		= x86_pmu_start,

	.stop		= x86_pmu_stop,

	.read		= x86_pmu_read,

	.unthrottle	= x86_pmu_unthrottle,

};

include/linux/perf_event.h

+2 −0
Original line number Diff line number Diff line
@@ -513,6 +513,8 @@ struct perf_event; 
struct pmu {

	int (*enable)			(struct perf_event *event);

	void (*disable)			(struct perf_event *event);

	int (*start)			(struct perf_event *event);

	void (*stop)			(struct perf_event *event);

	void (*read)			(struct perf_event *event);

	void (*unthrottle)		(struct perf_event *event);

};

kernel/perf_event.c

+18 −2
Original line number Diff line number Diff line
@@ -1493,6 +1493,22 @@ do { \ 
	return div64_u64(dividend, divisor);

}



static void perf_event_stop(struct perf_event *event)

{

	if (!event->pmu->stop)

		return event->pmu->disable(event);



	return event->pmu->stop(event);

}



static int perf_event_start(struct perf_event *event)

{

	if (!event->pmu->start)

		return event->pmu->enable(event);



	return event->pmu->start(event);

}



static void perf_adjust_period(struct perf_event *event, u64 nsec, u64 count)

{

	struct hw_perf_event *hwc = &event->hw;
@@ -1513,9 +1529,9 @@ static void perf_adjust_period(struct perf_event *event, u64 nsec, u64 count) 


	if (atomic64_read(&hwc->period_left) > 8*sample_period) {

		perf_disable();

		event->pmu->disable(event);

		perf_event_stop(event);

		atomic64_set(&hwc->period_left, 0);

		event->pmu->enable(event);

		perf_event_start(event);

		perf_enable();

	}

}

CRA Git | Maintained and supported by SUSTech CRA and CCSE