linux-kernel - Re: [PATCH v2] sched/fair: Document the slow path and fast path in select_task_rq

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Message-ID: <20211204112422.GU16608@worktop.programming.kicks-ass.net>
Date:   Sat, 4 Dec 2021 12:24:22 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Barry Song <21cnbao@...il.com>
Cc:     bristot@...hat.com, bsegall@...gle.com, dietmar.eggemann@....com,
        juri.lelli@...hat.com, mgorman@...e.de, mingo@...hat.com,
        rostedt@...dmis.org, vincent.guittot@...aro.org,
        linux-kernel@...r.kernel.org, linuxarm@...wei.com,
        yangyicong@...ilicon.com, Barry Song <song.bao.hua@...ilicon.com>
Subject: Re: [PATCH v2] sched/fair: Document the slow path and fast path in
 select_task_rq_fair

On Sat, Oct 16, 2021 at 07:11:09PM +0800, Barry Song wrote:
> From: Barry Song <song.bao.hua@...ilicon.com>
> 
> All People I know including myself took a long time to figure out
> that typical wakeup will always go to fast path and never go to
> slow path except WF_FORK and WF_EXEC.
> Vincent reminded me once in a linaro meeting and made me understand
> slow path won't happen for WF_TTWU. But my other friends repeatedly
> wasted a lot of time on testing this path like me before I reminded
> them.
> So obviously the code needs some document.
> 
> Cc: Vincent Guittot <vincent.guittot@...aro.org>
> Signed-off-by: Barry Song <song.bao.hua@...ilicon.com>
> ---

Thanks!