linux-kernel - Re: [PATCH v2 09/11] sched: test the cpu's capacity in wake affine

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Date:	Mon, 24 Nov 2014 14:23:12 +0100
From:	Vincent Guittot <vincent.guittot@...aro.org>
To:	Wanpeng Li <kernellwp@...il.com>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	LAK <linux-arm-kernel@...ts.infradead.org>,
	Preeti U Murthy <preeti@...ux.vnet.ibm.com>,
	Morten Rasmussen <Morten.Rasmussen@....com>,
	Mike Galbraith <efault@....de>,
	Nicolas Pitre <nicolas.pitre@...aro.org>,
	"linaro-kernel@...ts.linaro.org" <linaro-kernel@...ts.linaro.org>,
	Daniel Lezcano <daniel.lezcano@...aro.org>
Subject: Re: [PATCH v2 09/11] sched: test the cpu's capacity in wake affine

On 24 November 2014 at 01:34, Wanpeng Li <kernellwp@...il.com> wrote:
> Hi Vincent,
> On 5/28/14, 7:15 PM, Vincent Guittot wrote:
>>
>> On 28 May 2014 12:58, Peter Zijlstra <peterz@...radead.org> wrote:
>>>
>>> On Fri, May 23, 2014 at 05:53:03PM +0200, Vincent Guittot wrote:
>
> [snip]
>>>
>>> Now I'm only struggling to understand the rationale for this, its got
>>> LLC in there somewhere, but I'm failing to comprehend.
>>
>> Ah.. i have probably overestimated the fact that wake_affine was only
>> done at MC or SMT level but after reading more deeply the glags
>> configuration of all  sched_domain level , my assumption is not true.
>
>
> What's level the wake_affine should happen?

In 1st version of this patch, it was proposed to test the cpu_capacity
of idle CPU only if they were sharing their cache

Regards,
Vincent
>
> Regards,
> Wanpeng Li
>
>> So I need to test sd flag to make sure that their share their cache at
>> this level
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