linux-kernel - Re: [RFC 2/9] Use NOMEMALLOC reclaim to allow reclaim if PF

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Date:	Tue, 21 Aug 2007 16:07:11 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Christoph Lameter <clameter@....com>
Cc:	Pavel Machek <pavel@....cz>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	dkegel@...gle.com, David Miller <davem@...emloft.net>,
	Nick Piggin <npiggin@...e.de>
Subject: Re: [RFC 2/9] Use NOMEMALLOC reclaim to allow reclaim if
	PF_MEMALLOC is set

On Mon, 2007-08-20 at 14:17 -0700, Christoph Lameter wrote:
> On Mon, 20 Aug 2007, Peter Zijlstra wrote:
> 
> > > Its not that different.
> > 
> > Yes it is, disk based completion does not require memory, network based
> > completion requires unbounded memory.
> 
> Disk based completion only require no memory if its not on a stack of 
> other devices and if the interrupt handles is appropriately shaped. If 
> there are multile levels below or there is some sort of complex 
> completion handling then this also may require memory.

I'm not aware of such a scenario - but it could well be. Still if it
would it would take a _bounded_ amount of memory per page.

Network would still differ in that it requires an _unbounded_ amount of
packets to receive and process in order to receive that completion.

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