linux-kernel - Re: frequent lockups in 3.18rc4

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Message-ID: <20141122001111.GA26007@htj.dyndns.org>
Date:	Fri, 21 Nov 2014 19:11:11 -0500
From:	Tejun Heo <tj@...nel.org>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Dave Jones <davej@...hat.com>, Don Zickus <dzickus@...hat.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	the arch/x86 maintainers <x86@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Andy Lutomirski <luto@...capital.net>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
Subject: Re: frequent lockups in 3.18rc4

Hello, Frederic.

On Fri, Nov 21, 2014 at 10:44:46PM +0100, Frederic Weisbecker wrote:
> I fear that enumerating and fix the existing issues won't be enough.
> We can't find all the code sites out there which rely on not being
> faulted.

Oh, sure but that can take some time so adding documentation in the
mean time probably isn't a bad idea.

> The best would be to fix that from the percpu allocator itself, or
> vmalloc.

I don't think there's much percpu allocator itself can do.  The
ability to grow dynamically comes from being able to allocate
relatively consistent layout among areas for different CPUs and pretty
much requires vmalloc area and it'd generally be a good idea to take
out the vmalloc fault anyway.

Thanks.

-- 
tejun
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