linux-kernel - Re: [PATCH] sched:skip loop non-idle cpus after find an idle cpu while find_idlest

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Date:	Mon, 27 Oct 2014 16:58:05 +0800
From:	Yao Dongdong <yaodongdong@...wei.com>
To:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
CC:	Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] sched:skip loop non-idle cpus after find an idle cpu
 while find_idlest_cpu

On 2014/10/27 16:04, Srikar Dronamraju wrote:
> * Yao Dongdong <yaodongdong@...wei.com> [2014-10-27 11:13:17]:
>
>> Idle cpu is idler than non-idle cpu, so we needn't loop non-idle cpus after find an idle cpu.
>>
> While this check looks good,
> I dont see how we are avoiding a loop?
>
> Are you suggesting that we break of the for loop once we set
> shallowest_idle_cpu?
>
Thanks for your review.

I agree that the submit message is a bit misleading, what this patch do is just avoiding search for least_loaded_cpu
in non-idle cpus.

    sched:add check of shallowest_idle_cpu before search for least_loaded_cpu

    Idle cpu is idler than non-idle cpu, so we needn't search for least_loaded_cpu
    after we have found an idle cpu.

what about this?

Thanks,
Yao Dongdong

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