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

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Message-ID: <1261591603.4937.153.camel@laptop>
Date:	Wed, 23 Dec 2009 19:06:43 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Rakib Mullick <rakib.mullick@...il.com>
Cc:	Ingo Molnar <mingo@...e.hu>, LKML <linux-kernel@...r.kernel.org>
Subject: Re: SCHED: Is task migration necessary in sched_exec().

On Wed, 2009-12-23 at 18:52 +0600, Rakib Mullick wrote:

> 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?

Could have, but is very unlikely, and here we have one we know for sure.

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