linux-kernel - Re: [RFC PATCH 05/14] sched: account for blocked load waking back up

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Message-ID: <1329407875.2293.239.camel@twins>
Date:	Thu, 16 Feb 2012 16:57:55 +0100
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Paul Turner <pjt@...gle.com>
Cc:	linux-kernel@...r.kernel.org, Venki Pallipadi <venki@...gle.com>,
	Srivatsa Vaddagiri <vatsa@...ibm.com>,
	Mike Galbraith <efault@....de>,
	Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>,
	Ben Segall <bsegall@...gle.com>, Ingo Molnar <mingo@...e.hu>,
	Vaidyanathan Srinivasan <svaidy@...ux.vnet.ibm.com>
Subject: Re: [RFC PATCH 05/14] sched: account for blocked load waking back up

On Wed, 2012-02-01 at 17:38 -0800, Paul Turner wrote:
> +               if (se->avg.decay_count) {
> +                       /*
> +                        * In a wake-up migration we have to approximate the
> +                        * time sleeping.
> +                        */
> +                       se->avg.last_runnable_update -= (-se->avg.decay_count)
> +                                                       << 20;
> +                       update_entity_load_avg(se, 0);
> +               } 

That comment wants more why and how. I think I remember pjt telling me
about this last week, but those are already vague memories, I'll be sure
to be completely clueless in another week.
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