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perf: Fix scaling vs. perf_event_enable()

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Similar to the perf_enable_on_exec(), ensure that event timings are
consistent across perf_event_enable().

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: dvyukov@google.com
Cc: eranian@google.com
Cc: oleg@redhat.com
Cc: panand@redhat.com
Cc: sasha.levin@oracle.com
Cc: vince@deater.net
Link: http://lkml.kernel.org/r/20160224174948.218288698@infradead.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Peter Zijlstra 2016-02-24 18:45:49 +01:00 committed by Ingo Molnar
parent 7fce250915
commit bd2afa49d1
1 changed files with 23 additions and 19 deletions
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42
kernel/events/core.c
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@ -2069,14 +2069,27 @@ static void add_event_to_ctx(struct perf_event *event,
event->tstamp_stopped = tstamp;
}
static void task_ctx_sched_out(struct perf_cpu_context *cpuctx,
struct perf_event_context *ctx);
static void ctx_sched_out(struct perf_event_context *ctx,
struct perf_cpu_context *cpuctx,
enum event_type_t event_type);
static void
ctx_sched_in(struct perf_event_context *ctx,
struct perf_cpu_context *cpuctx,
enum event_type_t event_type,
struct task_struct *task);
static void task_ctx_sched_out(struct perf_cpu_context *cpuctx,
struct perf_event_context *ctx)
{
if (!cpuctx->task_ctx)
return;
if (WARN_ON_ONCE(ctx != cpuctx->task_ctx))
return;
ctx_sched_out(ctx, cpuctx, EVENT_ALL);
}
static void perf_event_sched_in(struct perf_cpu_context *cpuctx,
struct perf_event_context *ctx,
struct task_struct *task)
@ -2227,17 +2240,18 @@ static void __perf_event_enable(struct perf_event *event,
event->state <= PERF_EVENT_STATE_ERROR)
return;
update_context_time(ctx);
if (ctx->is_active)
ctx_sched_out(ctx, cpuctx, EVENT_TIME);
__perf_event_mark_enabled(event);
if (!ctx->is_active)
return;
if (!event_filter_match(event)) {
if (is_cgroup_event(event)) {
perf_cgroup_set_timestamp(current, ctx); // XXX ?
if (is_cgroup_event(event))
perf_cgroup_defer_enabled(event);
}
ctx_sched_in(ctx, cpuctx, EVENT_TIME, current);
return;
}
@ -2245,8 +2259,10 @@ static void __perf_event_enable(struct perf_event *event,
* If the event is in a group and isn't the group leader,
* then don't put it on unless the group is on.
*/
if (leader != event && leader->state != PERF_EVENT_STATE_ACTIVE)
if (leader != event && leader->state != PERF_EVENT_STATE_ACTIVE) {
ctx_sched_in(ctx, cpuctx, EVENT_TIME, current);
return;
}
task_ctx = cpuctx->task_ctx;
if (ctx->task)
@ -2658,18 +2674,6 @@ void __perf_event_task_sched_out(struct task_struct *task,
perf_cgroup_sched_out(task, next);
}
static void task_ctx_sched_out(struct perf_cpu_context *cpuctx,
struct perf_event_context *ctx)
{
if (!cpuctx->task_ctx)
return;
if (WARN_ON_ONCE(ctx != cpuctx->task_ctx))
return;
ctx_sched_out(ctx, cpuctx, EVENT_ALL);
}
/*
* Called with IRQs disabled
*/