linux-kernel - Re: [PATCH 02/10] mm: system wide ALLOC_NO

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Date:	Mon, 6 Aug 2007 12:15:16 -0700
From:	Daniel Phillips <phillips@...nq.net>
To:	Christoph Lameter <clameter@....com>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	David Miller <davem@...emloft.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Daniel Phillips <phillips@...gle.com>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Matt Mackall <mpm@...enic.com>,
	Lee Schermerhorn <Lee.Schermerhorn@...com>,
	Steve Dickson <SteveD@...hat.com>
Subject: Re: [PATCH 02/10] mm: system wide ALLOC_NO_WATERMARK

On Monday 06 August 2007 11:51, Christoph Lameter wrote:
> On Mon, 6 Aug 2007, Daniel Phillips wrote:
> > On Monday 06 August 2007 11:42, Christoph Lameter wrote:
> > > On Mon, 6 Aug 2007, Daniel Phillips wrote:
> > > > Currently your system likely would have died here, so ending up
> > > > with a reserve page temporarily on the wrong node is already an
> > > > improvement.
> > >
> > > The system would have died? Why?
> >
> > Because a block device may have deadlocked here, leaving the system
> > unable to clean dirty memory, or unable to load executables over
> > the network for example.
>
> So this is a locking problem that has not been taken care of?

A deadlock problem that we used to call memory recursion deadlock, aka: 
somebody in the vm writeout path needs to allocate memory, but there is 
no memory, so vm writeout stops forever.

Regards,

Daniel
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