linux-kernel - Re: frequent lockups in 3.18rc4

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Message-ID: <20141119051524.GA18547@redhat.com>
Date:	Wed, 19 Nov 2014 00:15:24 -0500
From:	Dave Jones <davej@...hat.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Don Zickus <dzickus@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	the arch/x86 maintainers <x86@...nel.org>
Subject: Re: frequent lockups in 3.18rc4

On Tue, Nov 18, 2014 at 08:40:55PM -0800, Linus Torvalds wrote:

 > Hmm, if we are getting soft-lockups here, maybe it suggest too much exit-work.
 > 
 > Some TIF_NOHZ loop, perhaps? You have nohz on, don't you?
 > 
 > That makes me wonder: does the problem go away if you disable NOHZ?

Does nohz=off do enough ? I couldn't convince myself after looking at
dmesg, and still seeing dynticks stuff in there.

I'll do a rebuild with all the CONFIG_NO_HZ stuff off, though it also changes
some other config stuff wrt timers.

	Dave

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