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

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Message-ID: <Pine.LNX.4.64.0709050507050.9141@schroedinger.engr.sgi.com>
Date:	Wed, 5 Sep 2007 05:14:06 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Nick Piggin <npiggin@...e.de>
cc:	Daniel Phillips <phillips@...nq.net>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	dkegel@...gle.com, Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	David Miller <davem@...emloft.net>
Subject: Re: [RFC 0/3] Recursive reclaim (on __PF_MEMALLOC)

On Wed, 5 Sep 2007, Nick Piggin wrote:

> However I really have an aversion to the near enough is good enough way of
> thinking. Especially when it comes to fundamental deadlocks in the VM. I
> don't know whether Peter's patch is completely clean yet, but fixing the
> fundamentally broken code has my full support.

Uhh. There are already numerous other issues why the VM is failing that is 
independent of Peter's approach.

> I hate it that there are theoretical bugs still left even if they would
> be hit less frequently than hardware failure. And that people are really
> happy to put even more of these things in :(

Theoretical bugs? Depends on one's creativity to come up with them I 
guess. So far we do not even get around to address the known issues and 
this multi subsystem patch has the potential of creating more.

> Anyway, as you know I like your patch and if that gives Peter a little
> more breathing space then it's a good thing. But I really hope he doesn't
> give up on it, and it should be merged one day.

Using the VM to throttle networking is a pretty bad thing because it 
assumes single critical user of memory. There are other consumers of 
memory and if you have a load that depends on other things than networking 
then you should not kill the other things that want memory.
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