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authorPeter Zijlstra <peterz@infradead.org>2016-01-11 15:40:59 +0100
committerIngo Molnar <mingo@kernel.org>2016-01-21 18:54:24 +0100
commit32132a3d0d5d6f127388be3e3fd7759f798c2eb4 (patch)
treee7d34248918aa1fe8ae6f4df6d44714b1867618b /kernel
parent39a4364076921511e212bc42f94fbf062c989576 (diff)
downloadop-kernel-dev-32132a3d0d5d6f127388be3e3fd7759f798c2eb4.zip
op-kernel-dev-32132a3d0d5d6f127388be3e3fd7759f798c2eb4.tar.gz
perf: Specialize perf_event_exit_task()
The perf_remove_from_context() usage in __perf_event_exit_task() is different from the other usages in that this site has already detached and scheduled out the task context. This will stand in the way of stronger assertions checking the (task) context scheduling invariants. Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: David Ahern <dsahern@gmail.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Vince Weaver <vincent.weaver@maine.edu> Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/events/core.c18
1 files changed, 11 insertions, 7 deletions
diff --git a/kernel/events/core.c b/kernel/events/core.c
index c27e046..66c9ad4 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -8726,7 +8726,13 @@ __perf_event_exit_task(struct perf_event *child_event,
* Do destroy all inherited groups, we don't care about those
* and being thorough is better.
*/
- perf_remove_from_context(child_event, !!child_event->parent);
+ raw_spin_lock_irq(&child_ctx->lock);
+ WARN_ON_ONCE(child_ctx->is_active);
+
+ if (!!child_event->parent)
+ perf_group_detach(child_event);
+ list_del_event(child_event, child_ctx);
+ raw_spin_unlock_irq(&child_ctx->lock);
/*
* It can happen that the parent exits first, and has events
@@ -8746,17 +8752,15 @@ static void perf_event_exit_task_context(struct task_struct *child, int ctxn)
{
struct perf_event *child_event, *next;
struct perf_event_context *child_ctx, *clone_ctx = NULL;
- unsigned long flags;
if (likely(!child->perf_event_ctxp[ctxn]))
return;
- local_irq_save(flags);
+ local_irq_disable();
+ WARN_ON_ONCE(child != current);
/*
* We can't reschedule here because interrupts are disabled,
- * and either child is current or it is a task that can't be
- * scheduled, so we are now safe from rescheduling changing
- * our context.
+ * and child must be current.
*/
child_ctx = rcu_dereference_raw(child->perf_event_ctxp[ctxn]);
@@ -8776,7 +8780,7 @@ static void perf_event_exit_task_context(struct task_struct *child, int ctxn)
*/
clone_ctx = unclone_ctx(child_ctx);
update_context_time(child_ctx);
- raw_spin_unlock_irqrestore(&child_ctx->lock, flags);
+ raw_spin_unlock_irq(&child_ctx->lock);
if (clone_ctx)
put_ctx(clone_ctx);
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