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

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Message-ID: <54727D03.4090909@gmail.com>
Date:	Mon, 24 Nov 2014 08:34:11 +0800
From:	Wanpeng Li <kernellwp@...il.com>
To:	Vincent Guittot <vincent.guittot@...aro.org>,
	Peter Zijlstra <peterz@...radead.org>
CC:	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

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?

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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