From: Christoph Lameter <clameter@sgi.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Martin Bligh <mbligh@mbligh.org>,
linux-mm@kvack.org, Nick Piggin <nickpiggin@yahoo.com.au>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
Rik van Riel <riel@redhat.com>
Subject: Re: [RFC] Remove unswappable anonymous pages off the LRU
Date: Thu, 15 Feb 2007 18:34:12 -0800 (PST) [thread overview]
Message-ID: <Pine.LNX.4.64.0702151830080.1471@schroedinger.engr.sgi.com> (raw)
In-Reply-To: <20070215174957.f1fb8711.akpm@linux-foundation.org>
On Thu, 15 Feb 2007, Andrew Morton wrote:
> Guys, this page-flag problem is really serious. -mm adds PG_mlocked and
> PG_readahead and the ext4 patches add PG_booked (am currently fighting the
> good fight there). There's ongoing steady growth in these things and soon
> we're going to be in a lot of pain.
Well is it possible to restrict some of the features to 64 bit only? There
we have lots of page flags.
One additional measure that may be possible is to have a page type field
(maybe 3 bits long) that would consolidate a series of page flags that
cannot occur together. But then we have issues with the atomicity of
updates to that field.
F.e.
page_type = { SLAB, LRU, MLOCK, RESERVED, BUDDY, <add 3 more types here> }
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next prev parent reply other threads:[~2007-02-16 2:34 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-02-15 21:05 [RFC] Remove unswappable anonymous pages off the LRU Christoph Lameter
2007-02-15 22:31 ` Rik van Riel
2007-02-15 22:41 ` Christoph Lameter
2007-02-15 22:50 ` Rik van Riel
2007-02-15 22:53 ` Christoph Lameter
2007-02-15 23:19 ` Andrew Morton
2007-02-15 23:20 ` Lee Schermerhorn
2007-02-16 0:15 ` Andrew Morton
2007-02-16 1:13 ` Andrew Morton
2007-02-16 1:24 ` KAMEZAWA Hiroyuki
2007-02-16 1:40 ` Martin Bligh
2007-02-16 1:49 ` Andrew Morton
2007-02-16 2:21 ` Martin Bligh
2007-02-16 2:34 ` Christoph Lameter [this message]
2007-02-16 2:48 ` Andrew Morton
2007-02-16 2:50 ` Christoph Lameter
2007-02-16 3:18 ` Andrew Morton
2007-02-16 3:36 ` Christoph Lameter
2007-02-16 3:42 ` Andrew Morton
2007-02-16 3:50 ` Christoph Lameter
2007-02-16 4:02 ` Andrew Morton
2007-02-16 4:07 ` Christoph Lameter
2007-02-16 4:03 ` Andrew Morton
2007-02-16 4:14 ` Rik van Riel
2007-02-16 4:15 ` Christoph Lameter
2007-02-16 4:57 ` KAMEZAWA Hiroyuki
2007-02-16 5:16 ` Andrew Morton
2007-02-16 5:25 ` Christoph Lameter
2007-02-16 5:41 ` Andrew Morton
2007-02-16 5:19 ` Christoph Lameter
2007-02-16 4:24 ` Andrew Morton
2007-02-16 8:15 ` Peter Zijlstra
2007-02-16 9:11 ` Rafael J. Wysocki
2007-02-16 9:19 ` Peter Zijlstra
2007-02-16 10:10 ` Christoph Lameter
2007-02-16 10:17 ` Peter Zijlstra
2007-02-16 11:04 ` Rafael J. Wysocki
2007-02-16 2:16 ` Christoph Lameter
2007-02-16 3:17 ` Martin Bligh
2007-02-16 3:29 ` Christoph Lameter
2007-02-16 8:10 ` Peter Zijlstra
2007-02-16 2:15 ` Christoph Lameter
2007-02-16 2:55 ` Christoph Lameter
2007-02-16 5:02 ` Christoph Lameter
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