linux-kernel - Re: [RFC PATCH 2/2] sched: Remove SD_WAKE_AFFINE flag and replace it with SD_BALANCE

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Message-ID: <20160531092314.GU3192@twins.programming.kicks-ass.net>
Date:	Tue, 31 May 2016 11:23:14 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Yuyang Du <yuyang.du@...el.com>
Cc:	mingo@...nel.org, linux-kernel@...r.kernel.org,
	umgwanakikbuti@...il.com, bsegall@...gle.com, pjt@...gle.com,
	morten.rasmussen@....com, vincent.guittot@...aro.org,
	dietmar.eggemann@....com
Subject: Re: [RFC PATCH 2/2] sched: Remove SD_WAKE_AFFINE flag and replace it
 with SD_BALANCE_WAKE

On Tue, May 31, 2016 at 09:11:38AM +0800, Yuyang Du wrote:
> SD_BALANCE_{FORK|EXEC|WAKE} flags are for select_task_rq() to select a
> CPU to run a new task or a waking task. SD_WAKE_AFFINE is a flag to
> try selecting the waker CPU to run the waking task.
> 
> SD_BALANCE_WAKE is not a sched_domain flag, but SD_WAKE_AFFINE is.

No, SD_BALANCE_{FORK,EXEC,WAKE} are very much sched_domain flags.

They indicate how wide we should look to place tasks on these events.