From mboxrd@z Thu Jan  1 00:00:00 1970
From: Daniel Phillips <phillips@phunq.net>
Subject: Re: [PATCH 00/10] foundations for reserve-based allocation
Date: Mon, 6 Aug 2007 12:31:04 -0700
References: <20070806102922.907530000@chello.nl> <200708061035.18742.phillips@phunq.net> <1186424248.11797.66.camel@lappy>
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To: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, David Miller <davem@davemloft.net>, Andrew Morton <akpm@linux-foundation.org>, Daniel Phillips <phillips@google.com>, Pekka Enberg <penberg@cs.helsinki.fi>, Christoph Lameter <clameter@sgi.com>, Matt Mackall <mpm@selenic.com>, Lee Schermerhorn <Lee.Schermerhorn@hp.com>, Steve Dickson <SteveD@redhat.com>
List-ID: <linux-mm.kvack.org>

On Monday 06 August 2007 11:17, Peter Zijlstra wrote:
> And how do we know a page was taken out of the reserves?

Why not return that in the low bit of the page address?  This is a 
little more cache efficient, does not leave that odd footprint in the 
page union and forces the caller to examine the 
alloc_pages(...P_MEMALLOC) return, making it harder to overlook the 
fact that it got a page out of reserve and forget to put one back 
later.

Regards,

Daniel

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