# Re: \[PATCH 3/6\] sched,perf,kvm: Fix preemption condition

- From: Peter Zijlstra \<peterz@infradead.org\>
- Date: 2021-06-02 14:24:02 
- List: linux-perf-users
- Page: https://ratatoskr.run/linux-perf-users/2021/06/206991
- Thread: https://ratatoskr.run/linux-block/2021/06/206979/t.md

```text
On Wed, Jun 02, 2021 at 10:15:16AM -0400, Mathieu Desnoyers wrote:
> ----- On Jun 2, 2021, at 9:12 AM, Peter Zijlstra peterz@infradead.org wrote:
> [...]
> > --- a/kernel/events/core.c
> > +++ b/kernel/events/core.c
> > @@ -8568,13 +8568,12 @@ static void perf_event_switch(struct tas
> > 		},
> > 	};
> > 
> > -	if (!sched_in && task->state == TASK_RUNNING)
> > +	if (!sched_in && current->on_rq) {
> > 		switch_event.event_id.header.misc |=
> > 				PERF_RECORD_MISC_SWITCH_OUT_PREEMPT;
> > +	}
> > 
> > -	perf_iterate_sb(perf_event_switch_output,
> > -		       &switch_event,
> > -		       NULL);
> > +	perf_iterate_sb(perf_event_switch_output, &switch_event, NULL);
> > }
> 
> There is a lot of code cleanup going on here which does not seem to belong
> to a "Fix" patch.

Maybe, but I so hate whitespace only patches :-/
```