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 20:07:04 -0800 (PST) [thread overview]
Message-ID: <Pine.LNX.4.64.0702152005130.1696@schroedinger.engr.sgi.com> (raw)
In-Reply-To: <20070215200204.899811b4.akpm@linux-foundation.org>
On Thu, 15 Feb 2007, Andrew Morton wrote:
> > could be used instead? For 1G of memory we would need
> >
> > 2^(30 - PAGE_SHIFT / 8 = 2^(30-12-3) = 2^15 = 32k bytes of a bitmap.
> >
> > Seems to be reasonable?
> >
>
> 32k per bit per gig, yes. Better for large PAGE_SIZE. More cachemisses.
>
> But will it come unstuck for machines which have a super-sparse pfn space?
IA64 is such a beast. I think IA64 would work fine if we had bitmap
vectors per zone. However, powerpc may have even super sparse zones. We
may have to ask them first.
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next prev parent reply other threads:[~2007-02-16 4:07 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
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 [this message]
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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