linux-kernel - Re: frequent lockups in 3.18rc4

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Message-ID: <20141217171404.GD30905@twins.programming.kicks-ass.net>
Date:	Wed, 17 Dec 2014 18:14:04 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Cc:	Andy Lutomirski <luto@...capital.net>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Mel Gorman <mgorman@...e.de>,
	Thomas Gleixner <tglx@...utronix.de>,
	Steven Rostedt <rostedt@...dmis.org>,
	Tejun Heo <tj@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Don Zickus <dzickus@...hat.com>, Dave Jones <davej@...hat.com>,
	the arch/x86 maintainers <x86@...nel.org>
Subject: Re: frequent lockups in 3.18rc4

On Wed, Dec 17, 2014 at 12:01:39PM -0500, Konrad Rzeszutek Wilk wrote:
> > Linus, do you have a pointer to whatever version of the patch you tried?
> 
> The patch was this:
> 
> a) http://article.gmane.org/gmane.linux.kernel/1835331
> 
> Then Jurgen had a patch:
> https://lkml.kernel.org/g/CA+55aFxSRujj=cM1NkXYvxmo=Y1hb1e3tgLhdh1JDphzV6WKRw@mail.gmail.com
> which was one fix for one bug that ended up being fixed in QEMU - so
> it can be ignored.
> 
> But my understanding of that thread was that it said patch 'a)' did not
> fix Dave's issues - and the conversation went off on NMI watchdog?
> 
> I will look up the giant thread to make sense.

No, you're right in that the patch didn't solve the issue at hand and
that the conversation moved on into a different direction.

But I would very much like to see it (or something very much like it)
happen, because it does make the code much saner.
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