perf: Disable all pmus on unthrottling and rescheduling

Currently, only one PMU in a context gets disabled during unthrottling
and event_sched_{out,in}(), however, events in one context may belong to
different pmus, which results in PMUs being reprogrammed while they are
still enabled.

This means that mixed PMU use [which is rare in itself] resulted in
potentially completely unreliable results: corrupted events, bogus
results, etc.

This patch temporarily disables PMUs that correspond to
each event in the context while these events are being modified.

Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Reviewed-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Link: http://lkml.kernel.org/r/1387196256-8030-1-git-send-email-alexander.shishkin@linux.intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>

diff --git a/kernel/events/core.c b/kernel/events/core.c
index 72348dc192c11e7a85560b67bc792415d969e22f..f5744010a8d2f980f1902279de41a866ceb00a37 100644 (file)
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -1396,6 +1396,8 @@ event_sched_out(struct perf_event *event,
        if (event->state != PERF_EVENT_STATE_ACTIVE)
                return;
 
+       perf_pmu_disable(event->pmu);
+
        event->state = PERF_EVENT_STATE_INACTIVE;
        if (event->pending_disable) {
                event->pending_disable = 0;
@@ -1412,6 +1414,8 @@ event_sched_out(struct perf_event *event,
                ctx->nr_freq--;
        if (event->attr.exclusive || !cpuctx->active_oncpu)
                cpuctx->exclusive = 0;
+
+       perf_pmu_enable(event->pmu);
 }
 
 static void
@@ -1652,6 +1656,7 @@ event_sched_in(struct perf_event *event,
                 struct perf_event_context *ctx)
 {
        u64 tstamp = perf_event_time(event);
+       int ret = 0;
 
        if (event->state <= PERF_EVENT_STATE_OFF)
                return 0;
@@ -1674,10 +1679,13 @@ event_sched_in(struct perf_event *event,
         */
        smp_wmb();
 
+       perf_pmu_disable(event->pmu);
+
        if (event->pmu->add(event, PERF_EF_START)) {
                event->state = PERF_EVENT_STATE_INACTIVE;
                event->oncpu = -1;
-               return -EAGAIN;
+               ret = -EAGAIN;
+               goto out;
        }
 
        event->tstamp_running += tstamp - event->tstamp_stopped;
@@ -1693,7 +1701,10 @@ event_sched_in(struct perf_event *event,
        if (event->attr.exclusive)
                cpuctx->exclusive = 1;
 
-       return 0;
+out:
+       perf_pmu_enable(event->pmu);
+
+       return ret;
 }
 
 static int
@@ -2743,6 +2754,8 @@ static void perf_adjust_freq_unthr_context(struct perf_event_context *ctx,
                if (!event_filter_match(event))
                        continue;
 
+               perf_pmu_disable(event->pmu);
+
                hwc = &event->hw;
 
                if (hwc->interrupts == MAX_INTERRUPTS) {
@@ -2752,7 +2765,7 @@ static void perf_adjust_freq_unthr_context(struct perf_event_context *ctx,
                }
 
                if (!event->attr.freq || !event->attr.sample_freq)
-                       continue;
+                       goto next;
 
                /*
                 * stop the event and update event->count
@@ -2774,6 +2787,8 @@ static void perf_adjust_freq_unthr_context(struct perf_event_context *ctx,
                        perf_adjust_period(event, period, delta, false);
 
                event->pmu->start(event, delta > 0 ? PERF_EF_RELOAD : 0);
+       next:
+               perf_pmu_enable(event->pmu);
        }
 
        perf_pmu_enable(ctx->pmu);