linux-kernel - Re: SCHED: Is task migration necessary in sched

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Message-ID: <b9df5fa10912230452q6edac4d3wb837a2e550cc5092@mail.gmail.com>
Date:	Wed, 23 Dec 2009 18:52:34 +0600
From:	Rakib Mullick <rakib.mullick@...il.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Ingo Molnar <mingo@...e.hu>, LKML <linux-kernel@...r.kernel.org>
Subject: Re: SCHED: Is task migration necessary in sched_exec().

On 12/23/09, Peter Zijlstra <peterz@...radead.org> wrote:
> On Wed, 2009-12-23 at 18:04 +0600, Rakib Mullick wrote:
>  > On 12/23/09, Peter Zijlstra <peterz@...radead.org> wrote:
>  > > On Wed, 2009-12-23 at 17:35 +0600, Rakib Mullick wrote:
>
>  So its a win, right?
>
Yes - a fair win. But if load balancer moves other tasks from the runqueue
(2nd or 3rd task from your ex.) and thats how we also can achive 1/2 of cpu1's
time , right? Those waiting tasks could have effective 0 cache footprint too.
If they were not run before - right?
>
>
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