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

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Message-ID: <20150929111047.618f066f@gandalf.local.home>
Date:	Tue, 29 Sep 2015 11:10:47 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	mingo@...nel.org, linux-kernel@...r.kernel.org,
	torvalds@...ux-foundation.org, fweisbec@...il.com, oleg@...hat.com,
	umgwanakikbuti@...il.com, tglx@...utronix.de
Subject: Re: [RFC][PATCH 04/11] sched: Rework TASK_DEAD preemption exception

On Tue, 29 Sep 2015 11:28:29 +0200
Peter Zijlstra <peterz@...radead.org> 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: Steven Rostedt <rostedt@...dmis.org>

-- Steve
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