[RFC][PATCH 11/12] perf: Specialize perf_event_exit_task()

[Peter Zijlstra <peterz@infradead.org>]

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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>
---
 kernel/events/core.c |   18 +++++++++++-------
 1 file changed, 11 insertions(+), 7 deletions(-)

--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -8726,7 +8726,13 @@ __perf_event_exit_task(struct perf_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 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
 	 */
 	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);