linux-kernel - Re: [RFC][PATCH 12/12] perf: Collapse and fix event_function

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Date:	Wed, 13 Jan 2016 18:30:05 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc:	mingo@...nel.org, eranian@...gle.com, linux-kernel@...r.kernel.org,
	vince@...ter.net, dvyukov@...gle.com, andi@...stfloor.org,
	jolsa@...hat.com
Subject: Re: [RFC][PATCH 12/12] perf: Collapse and fix event_function_call()
 users

On Wed, Jan 13, 2016 at 03:46:58PM +0200, Alexander Shishkin wrote:
> Peter Zijlstra <peterz@...radead.org> writes:
> 
> > @@ -2250,7 +2269,11 @@ static void __perf_event_enable(struct p
> >  	if (leader != event && leader->state != PERF_EVENT_STATE_ACTIVE)
> >  		return;
> >  
> > -	ctx_resched(cpuctx, ctx);
> > +	task_ctx = cpuctx->task_ctx;
> > +	if (ctx->task)
> > +		WARN_ON_ONCE(task_ctx != ctx);
> > +
> > +	ctx_resched(cpuctx, task_ctx);
> 
> Afaict, ctx_resched() path already does this in task_ctx_sched_out().

It does not; that got changed somewhere along the way :-)