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

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Message-ID: <20070911074125.GA27679@wotan.suse.de>
Date:	Tue, 11 Sep 2007 09:41:26 +0200
From:	Nick Piggin <npiggin@...e.de>
To:	Christoph Lameter <clameter@....com>
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 Mon, Sep 10, 2007 at 12:29:32PM -0700, Christoph Lameter wrote:
> On Wed, 5 Sep 2007, Nick Piggin wrote:
> 
> > Implementation issues aside, the problem is there and I would like to
> > see it fixed regardless if some/most/or all users in practice don't
> > hit it.
> 
> I am all for fixing the problem but the solution can be much simpler and 
> more universal. F.e. the amount of tcp data in flight may be controlled 
> via some limit so that other subsystems can continue to function even if 
> we are overwhelmed by network traffic. Peter's approach establishes the 
> limit by failing PF_MEMALLOC allocations. If that occurs then other 

Can you to propose a solution that is much simpler and more universal?


> subsystems (like the disk, or even fork/exec or memory management 
> allocation) will no longer operate since their allocations no longer 
> succeed which will make the system even more fragile and may lead to 
> subsequent failures.

You're saying we shouldn't fix an out of memory deadlocks because
that might result in ENOMEM errors being returned, rather than the
system locking up?

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