linux-kernel - Re: softlockups in multi_cpu

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Message-ID: <CACVXFVMsO1fvbQmsPMTvLmyNW=_cJzYPCtzACjYAuq4GcLn7kA@mail.gmail.com>
Date:	Sat, 7 Mar 2015 10:55:40 +0800
From:	Ming Lei <ming.lei@...onical.com>
To:	Davidlohr Bueso <dave@...olabs.net>
Cc:	Jason Low <jason.low2@...com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...nel.org>,
	Sasha Levin <sasha.levin@...cle.com>,
	Peter Zijlstra <peterz@...radead.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Dave Jones <davej@...emonkey.org.uk>
Subject: Re: softlockups in multi_cpu_stop

On Sat, Mar 7, 2015 at 10:29 AM, Davidlohr Bueso <dave@...olabs.net> wrote:
> On Fri, 2015-03-06 at 18:26 -0800, Davidlohr Bueso wrote:
>> That's not what this is about. New lock _owners_ need to worry about
>                                                       ^^^ make that "need not"

Sorry, could you explain a bit why new owner can't be scheduled
out(on_cpu becomes zero)? If that is possible, it still can cause
soft lockup like current problem.

Thanks,
Ming Lei
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