linux-kernel - Re: [RFC 0/3] Recursive reclaim (on __PF

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Message-Id: <1187119978.5337.1.camel@lappy>
Date:	Tue, 14 Aug 2007 21:32:58 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Christoph Lameter <clameter@....com>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC 0/3] Recursive reclaim (on __PF_MEMALLOC)

On Tue, 2007-08-14 at 08:29 -0700, Christoph Lameter wrote:
> On Tue, 14 Aug 2007, Peter Zijlstra wrote:
> 
> > On Tue, 2007-08-14 at 07:21 -0700, Christoph Lameter wrote:
> > > The following patchset implements recursive reclaim. Recursive reclaim
> > > is necessary if we run out of memory in the writeout patch from reclaim.
> > > 
> > > This is f.e. important for stacked filesystems or anything that does
> > > complicated processing in the writeout path.
> > > 
> > > Recursive reclaim works because it limits itself to only reclaim pages
> > > that do not require writeout. It will only remove clean pages from the LRU.
> > > The dirty throttling of the VM during regular reclaim insures that the amount
> > > of dirty pages is limited. 
> > 
> > No it doesn't. All memory can be tied up by anonymous pages - who are
> > dirty by definition and are not clamped by the dirty limit.
> 
> Ok but that could be addressed by making sure that a certain portion of 
> memory is reserved for clean file backed pages.

Which gets us back to the initial problem of sizing this portion and
ensuring it is big enough to service the need.



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