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Merge branch 'linus' into perf/core, to pick up fixes

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Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Ingo Molnar
2019-04-16 12:02:43 +02:00
parent cabf5ebbab 618d919cae
commit 496156e364
500 changed files with 5216 additions and 2821 deletions
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52
kernel/events/core.c
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@@ -2009,8 +2009,8 @@ event_sched_out(struct perf_event *event,
event->pmu->del(event, 0);
event->oncpu = -1;
if (event->pending_disable) {
event->pending_disable = 0;
if (READ_ONCE(event->pending_disable) >= 0) {
WRITE_ONCE(event->pending_disable, -1);
state = PERF_EVENT_STATE_OFF;
}
perf_event_set_state(event, state);
@@ -2198,7 +2198,8 @@ EXPORT_SYMBOL_GPL(perf_event_disable);
void perf_event_disable_inatomic(struct perf_event *event)
{
event->pending_disable = 1;
WRITE_ONCE(event->pending_disable, smp_processor_id());
/* can fail, see perf_pending_event_disable() */
irq_work_queue(&event->pending);
}
@@ -5810,10 +5811,45 @@ void perf_event_wakeup(struct perf_event *event)
}
}
static void perf_pending_event_disable(struct perf_event *event)
{
int cpu = READ_ONCE(event->pending_disable);
if (cpu < 0)
return;
if (cpu == smp_processor_id()) {
WRITE_ONCE(event->pending_disable, -1);
perf_event_disable_local(event);
return;
}
/*
* CPU-A CPU-B
*
* perf_event_disable_inatomic()
* @pending_disable = CPU-A;
* irq_work_queue();
*
* sched-out
* @pending_disable = -1;
*
* sched-in
* perf_event_disable_inatomic()
* @pending_disable = CPU-B;
* irq_work_queue(); // FAILS
*
* irq_work_run()
* perf_pending_event()
*
* But the event runs on CPU-B and wants disabling there.
*/
irq_work_queue_on(&event->pending, cpu);
}
static void perf_pending_event(struct irq_work *entry)
{
struct perf_event *event = container_of(entry,
struct perf_event, pending);
struct perf_event *event = container_of(entry, struct perf_event, pending);
int rctx;
rctx = perf_swevent_get_recursion_context();
@@ -5822,10 +5858,7 @@ static void perf_pending_event(struct irq_work *entry)
* and we won't recurse 'further'.
*/
if (event->pending_disable) {
event->pending_disable = 0;
perf_event_disable_local(event);
}
perf_pending_event_disable(event);
if (event->pending_wakeup) {
event->pending_wakeup = 0;
@@ -10236,6 +10269,7 @@ perf_event_alloc(struct perf_event_attr *attr, int cpu,
init_waitqueue_head(&event->waitq);
event->pending_disable = -1;
init_irq_work(&event->pending, perf_pending_event);
mutex_init(&event->mmap_mutex);