linux-kernel - Re: [PATCH] perf, core: Fix initial task

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Date:	Tue, 7 Jun 2011 14:10:50 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	paulus@...ba.org, mingo@...e.hu, linux-kernel@...r.kernel.org,
	oleg@...hat.com
Subject: Re: [PATCH] perf, core: Fix initial task_ctx/event installation

On Tue, Jun 07, 2011 at 12:28:56AM +0200, Jiri Olsa wrote:
> On Tue, Jun 07, 2011 at 12:23:28AM +0200, Peter Zijlstra wrote:
> > This works for me..
> > 
> > ---
> >  kernel/events/core.c |   28 +++++++++++++++++-----------
> >  1 files changed, 17 insertions(+), 11 deletions(-)
> > 
> > diff --git a/kernel/events/core.c b/kernel/events/core.c
> > index ba89f40..5e8c7b1 100644
> > --- a/kernel/events/core.c
> > +++ b/kernel/events/core.c
> > @@ -1505,25 +1505,31 @@ static int  __perf_install_in_context(void *info)
> >  	struct perf_event_context *task_ctx = cpuctx->task_ctx;
> >  	struct task_struct *task = current;
> >  
> > -	perf_ctx_lock(cpuctx, cpuctx->task_ctx);
> > +	perf_ctx_lock(cpuctx, task_ctx);
> >  	perf_pmu_disable(cpuctx->ctx.pmu);
> >  
> >  	/*
> >  	 * If there was an active task_ctx schedule it out.
> >  	 */
> > -	if (task_ctx) {
> > +	if (task_ctx)
> >  		task_ctx_sched_out(task_ctx);
> > -		/*
> > -		 * If the context we're installing events in is not the
> > -		 * active task_ctx, flip them.
> > -		 */
> > -		if (ctx->task && task_ctx != ctx) {
> > -			raw_spin_unlock(&cpuctx->ctx.lock);
> > -			raw_spin_lock(&ctx->lock);
> > -			cpuctx->task_ctx = task_ctx = ctx;
> > -		}
> > +
> > +	/*
> > +	 * If the context we're installing events in is not the
> > +	 * active task_ctx, flip them.
> > +	 */
> > +	if (ctx->task && task_ctx != ctx) {
> > +		if (task_ctx)
> > +			raw_spin_unlock(&task_ctx->lock);
> > +		raw_spin_lock(&ctx->lock);
> > +		task_ctx = ctx;
> > +	}
> > +
> > +	if (task_ctx) {
> > +		cpuctx->task_ctx = task_ctx;
> >  		task = task_ctx->task;
> >  	}
> > +
> >  	cpu_ctx_sched_out(cpuctx, EVENT_ALL);
> >  
> >  	update_context_time(ctx);
> > 
> > 
> 
> just came back :) seems ok.. I'll test tomorow and let you know
works ok for me

thanks,
jirka
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