linux-kernel - Re: [PATCH] sched: Update task->on_rq when tasks are moving between runqueues

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Message-ID: <20151025100924.GP2508@worktop.programming.kicks-ass.net>
Date:	Sun, 25 Oct 2015 11:09:24 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Olav Haugan <ohaugan@...eaurora.org>
Cc:	mingo@...hat.com, linux-kernel@...r.kernel.org,
	linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH] sched: Update task->on_rq when tasks are moving between
 runqueues

On Sat, Oct 24, 2015 at 11:01:02AM -0700, Olav Haugan wrote:
> Task->on_rq has three states:
> 	0 - Task is not on runqueue (rq)
> 	1 (TASK_ON_RQ_QUEUED) - Task is on rq
> 	2 (TASK_ON_RQ_MIGRATING) - Task is on rq but in the process of being
> 	migrated to another rq
> 
> When a task is moving between rqs task->on_rq state should be
> TASK_ON_RQ_MIGRATING

Only when not holding both rq locks..
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