linux-kernel - Re: [PATCH 4/4] sched: Document Program-Order guarantees

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Date:	Thu, 3 Dec 2015 21:16:48 +0800
From:	Boqun Feng <boqun.feng@...il.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	mingo@...nel.org, oleg@...hat.com, linux-kernel@...r.kernel.org,
	paulmck@...ux.vnet.ibm.com, corbet@....net, mhocko@...nel.org,
	dhowells@...hat.com, torvalds@...ux-foundation.org,
	will.deacon@....com, waiman.long@....com, pjt@...gle.com
Subject: Re: [PATCH 4/4] sched: Document Program-Order guarantees

On Thu, Dec 03, 2015 at 01:40:14PM +0100, Peter Zijlstra wrote:
[snip]
> + *
> + *   CPU0 (schedule)  CPU1 (try_to_wake_up) CPU2 (schedule)
> + *
> + *   LOCK rq(0)->lock LOCK X->pi_lock
> + *   dequeue X
> + *   sched-out X
> + *   smp_store_release(X->on_cpu, 0);
> + *
> + *                    smp_cond_acquire(!X->on_cpu);
> + *                    X->state = WAKING
> + *                    set_task_cpu(X,2)
> + *
> + *                    LOCK rq(2)->lock
> + *                    enqueue X
> + *                    X->state = RUNNING
> + *                    UNLOCK rq(2)->lock
> + *
> + *                                          LOCK rq(2)->lock // orders against CPU1
> + *                                          sched-out Z
> + *                                          sched-in X
> + *                                          UNLOCK rq(1)->lock
						^^^^^^^^^^^^^^^

This is a typo, right? Should be "UNLOCK rq(2)->lock".

Regards,
Boqun

> + *
> + *                    UNLOCK X->pi_lock
> + *   UNLOCK rq(0)->lock
> + *
> + *

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