linux-kernel - Re: [PATCH 04/10] mm: slub: add knowledge of reserve pages

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Date:	Wed, 8 Aug 2007 11:46:36 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Christoph Lameter <clameter@....com>
Cc:	Matt Mackall <mpm@...enic.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	David Miller <davem@...emloft.net>,
	Daniel Phillips <phillips@...gle.com>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Lee Schermerhorn <Lee.Schermerhorn@...com>,
	Steve Dickson <SteveD@...hat.com>
Subject: Re: [PATCH 04/10] mm: slub: add knowledge of reserve pages

On Wed, 8 Aug 2007 10:57:13 -0700 (PDT)
Christoph Lameter <clameter@....com> wrote:

> I think in general irq context reclaim is doable. Cannot see obvious 
> issues on a first superficial pass through rmap.c. The irq holdoff would 
> be pretty long though which may make it unacceptable.

The IRQ holdoff could be tremendous.  But if it is sufficiently infrequent
and if the worst effect is merely a network rx ring overflow then the tradeoff
might be a good one.
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