linux-kernel - Re: [PATCH 4/4] sched: Idle task shortcut optimization

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Message-ID: <20140117152352.GL11314@laptop.programming.kicks-ass.net>
Date:	Fri, 17 Jan 2014 16:23:52 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Daniel Lezcano <daniel.lezcano@...aro.org>
Cc:	mingo@...nel.org, linux-kernel@...r.kernel.org,
	linaro-kernel@...ts.linaro.org, alex.shi@...aro.org
Subject: Re: [PATCH 4/4] sched: Idle task shortcut optimization

On Fri, Jan 17, 2014 at 04:09:39PM +0100, Daniel Lezcano wrote:
> On 01/17/2014 03:09 PM, Peter Zijlstra wrote:
> >On Fri, Jan 17, 2014 at 10:04:04AM +0100, Daniel Lezcano wrote:
> >>+	schedstat_inc(rq, sched_goidle);
> >>+#ifdef CONFIG_SMP
> >>+	/* Trigger the post schedule to do an idle_enter for CFS */
> >>+	rq->post_schedule = 1;
> >>+#endif
> >>+	return rq->idle;
> >
> >Urgh, that retains the stupid idle crap like it is.
> >
> >I've not yet tested this, but is there a reason something like the below
> >couldn't work?
> 
> I tested it by running hackbench and it seems to work as expected.

Thanks, I was still looking through the throttling. I'll keep it then
:-)
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