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

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Date:	Thu, 16 Feb 2012 17:02:22 +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:

>         u64 last_runnable_update, decay_count;

> +       /* we track migrations using entity decay_count == 0 */
> +       if (unlikely(se->avg.decay_count <= 0)) { 

!sleep dequeue isn't migrate only, also, <= 0 on an unsigned is weird.


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