linux-kernel - Re: [RFC][PATCH 04/11] sched: Rework TASK

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Message-ID: <20150929134125.GF31582@lerouge>
Date:	Tue, 29 Sep 2015 15:41:26 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	mingo@...nel.org, linux-kernel@...r.kernel.org,
	torvalds@...ux-foundation.org, oleg@...hat.com,
	umgwanakikbuti@...il.com, tglx@...utronix.de, rostedt@...dmis.org
Subject: Re: [RFC][PATCH 04/11] sched: Rework TASK_DEAD preemption exception

On Tue, Sep 29, 2015 at 11:28:29AM +0200, Peter Zijlstra wrote:
> TASK_DEAD is special in that the final schedule call from do_exit()
> must be done with preemption disabled.
> 
> This leads to a violation of our new scheduling invariant which states
> that the preempt count should be 2. Move the check for TASK_DEAD out
> of the debug check and use it to decrement the preempt count (from 2
> to 1).
> 
> Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>

Reviewed-by: Frederic Weisbecker <fweisbec@...il.com>
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