linux-kernel - Re: [RFC PATCH 2/3] sched: add yield

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Message-ID: <1291838697.28378.161.camel@laptop>
Date:	Wed, 08 Dec 2010 21:04:57 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Rik van Riel <riel@...hat.com>
Cc:	kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
	Avi Kiviti <avi@...hat.com>,
	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>,
	Ingo Molnar <mingo@...e.hu>,
	Anthony Liguori <aliguori@...ux.vnet.ibm.com>,
	Paul Turner <pjt@...gle.com>
Subject: Re: [RFC PATCH 2/3] sched: add yield_to function

On Wed, 2010-12-08 at 21:00 +0100, Peter Zijlstra wrote:
> +       lag0 = avg_vruntime(cfs_rq_of(se));
> +       p_lag0 = avg_vruntime(cfs_rq_of(p_se));
> +
> +       lag = se->vruntime - avg_vruntime(cfs_rq);
> +       p_lag = p_se->vruntime - avg_vruntime(p_cfs_rq);
> +
> +       if (p_lag > lag) { /* if P is owed less service */
> +               se->vruntime = lag0 + p_lag;
> +               p_se->vruntime = p_lag + lag;
> +       } 

clearly that should read:

  p_se->vruntime = p_lag0 + lag;
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