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>

diff --git a/kernel/events/core.c b/kernel/events/core.c
index c27e04655d86c32475205973c1fba91bb4a9c1f8..66c9ad4f8707d33ff5455dcd9fd3df9a775e747f 100644 (file)
--- 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);