linux-kernel - Re: [patch 00/19] VM pageout scalability improvements

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Message-ID: <20080104115524.7d906f94@bree.surriel.com>
Date:	Fri, 4 Jan 2008 11:55:24 -0500
From:	Rik van Riel <riel@...hat.com>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Lee Schermerhorn <Lee.Schermerhorn@...com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Eric Whitney <eric.whitney@...com>,
	Nick Dokos <nicholas.dokos@...com>
Subject: Re: [patch 00/19] VM pageout scalability improvements

On Fri, 04 Jan 2008 17:34:00 +0100
Andi Kleen <andi@...stfloor.org> wrote:
> Lee Schermerhorn <Lee.Schermerhorn@...com> writes:
> 
> > We can easily [he says, glibly] reproduce the hang on the anon_vma lock
> 
> Is that a NUMA platform? On non x86? Perhaps you just need queued spinlocks?

I really think that the anon_vma and i_mmap_lock spinlock hangs are
due to the lack of queued spinlocks.  Not because I have seen your
system hang, but because I've seen one of Larry's test systems here
hang in scary/amusing ways :)

With queued spinlocks the system should just slow down, not hang.

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