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From: Rik van Riel <riel@redhat.com>
To: Christoph Lameter <clameter@sgi.com>
Cc: linux-kernel@vger.kernel.org, Mel Gorman <mel@csn.ul.ie>,
Nick Piggin <npiggin@suse.de>,
Andrew Morton <akpm@linux-foundation.org>,
apw@shadowen.org, linux-mm@kback.org
Subject: Re: [rfc 10/10] Pageflags land grab
Date: Sat, 1 Mar 2008 12:21:56 -0500 [thread overview]
Message-ID: <20080301122156.5994b949@bree.surriel.com> (raw)
In-Reply-To: <20080301040622.220638278@sgi.com>
On Fri, 29 Feb 2008 20:05:44 -0800
Christoph Lameter <clameter@sgi.com> wrote:
> We have enough page flags after vmemmap no longer uses section ids.
>
> Reserve 5 of the 6 saved flags for functionality that is currently
> under development in the VM.
>
> The new flags are only available if either of these conditions are met:
>
> 1. 64 Bit system. (then we have 8 more free of the 32)
>
> 2. !NUMA. In that case 2 bits are needed for the zone
> id which leaves 30 page flag bits. Of those we use 24. 6 left.
>
> 3. !SPARSEMEM. In that case we use 5 bits of the 30 available
> for the node. 1 leftover.
>
> 4. SPARSEMEM_VMEMMAP. Case 3 applies.
Nice! I like your patch series.
--
All rights reversed.
next prev parent reply other threads:[~2008-03-01 17:22 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-03-01 4:05 [rfc 00/10] [RFC] Page flags: Saving some, making handling easier etc Christoph Lameter
2008-03-01 4:05 ` [rfc 01/10] Pageflags: Use an enum for the flags Christoph Lameter
2008-03-03 10:09 ` Mel Gorman
2008-03-01 4:05 ` [rfc 02/10] Pageflags: Introduce macros to generate page flag functions Christoph Lameter
2008-03-01 4:05 ` [rfc 03/10] Pageflags: Convert to the use of new macros Christoph Lameter
2008-03-03 10:24 ` Mel Gorman
2008-03-03 18:03 ` Christoph Lameter
2008-03-07 11:13 ` Mel Gorman
2008-03-01 4:05 ` [rfc 04/10] Pageflags: Eliminate PG_readahead Christoph Lameter
2008-03-01 4:05 ` [rfc 05/10] Sparsemem: Vmemmap does not need section bits Christoph Lameter
2008-03-01 4:05 ` [rfc 06/10] Kbuild: Create a way to create preprocessor constants from C expressions Christoph Lameter
2008-03-01 4:05 ` [rfc 07/10] Pageflags: Get rid of FLAGS_RESERVED Christoph Lameter
2008-03-01 16:26 ` Rik van Riel
2008-03-03 17:57 ` Christoph Lameter
2008-03-01 4:05 ` [rfc 08/10] Export NR_MAX_ZONES to the preprocessor Christoph Lameter
2008-03-01 4:05 ` [rfc 09/10] Get rid of __ZONE_COUNT Christoph Lameter
2008-03-01 4:05 ` [rfc 10/10] Pageflags land grab Christoph Lameter
2008-03-01 17:21 ` Rik van Riel [this message]
2008-03-04 0:04 [rfc 00/10] [Patch] Page flags: Cleanup, reorg and introduce 5 new flags Christoph Lameter
2008-03-04 0:05 ` [rfc 10/10] Pageflags: Land grab Christoph Lameter
2008-03-04 1:27 ` Andi Kleen
2008-03-04 5:38 ` Christoph Lameter
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