From: Christoph Lameter <clameter@sgi.com>
To: Rik van Riel <riel@redhat.com>
Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [RFC PATCH 3/10] define page_file_cache
Date: Tue, 6 Nov 2007 19:26:33 -0800 (PST) [thread overview]
Message-ID: <Pine.LNX.4.64.0711061920510.5746@schroedinger.engr.sgi.com> (raw)
In-Reply-To: <20071106221710.3f9b8dd6@bree.surriel.com>
n Tue, 6 Nov 2007, Rik van Riel wrote:
> Every anonymous, tmpfs or shared memory segment page is potentially
> swap backed. That is the whole point of the PG_swapbacked flag.
One of the current issues with anonymous pages is the accounting when
they become file backed and get dirty. There are performance issue with
swap writeout because we are not doing it in file order and on a page by
page basis.
Do ramfs pages count as memory backed?
> A page from a filesystem like ext3 or NFS cannot suddenly turn into
> a swap backed page. This page "nature" is not changed during the
> lifetime of a page.
Well COW sortof does that but then its a new page.
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next prev parent reply other threads:[~2007-11-07 3:26 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-11-03 22:42 [RFC PATCH 0/10] split anon and file LRUs Rik van Riel
2007-11-03 22:54 ` [RFC PATCH 1/10] move isolate_lru_page to vmscan.c Rik van Riel
2007-11-07 2:13 ` Christoph Lameter
2007-11-03 22:54 ` [RFC PATCH 2/10] free swap space entries if vm_swap_full() Rik van Riel
2007-11-07 2:20 ` Christoph Lameter
2007-11-07 2:48 ` Rik van Riel
2007-11-03 22:55 ` [RFC PATCH 3/10] define page_file_cache Rik van Riel
2007-11-07 2:23 ` Christoph Lameter
2007-11-07 2:55 ` Rik van Riel
2007-11-07 3:02 ` Christoph Lameter
2007-11-07 3:17 ` Rik van Riel
2007-11-07 3:26 ` Christoph Lameter [this message]
2007-11-07 14:35 ` Rik van Riel
2007-11-07 18:06 ` Christoph Lameter
2007-11-07 18:17 ` Rik van Riel
2007-11-07 18:18 ` Christoph Lameter
2007-11-03 22:55 ` [RFC PATCH 4/10] debug page_file_cache Rik van Riel
2007-11-03 22:56 ` [RFC PATCH 5/10] use an indexed array for LRU lists and variables Rik van Riel
2007-11-03 23:01 ` [RFC PATCH 6/10] split anon and file LRUs Rik van Riel
2007-11-07 2:28 ` Christoph Lameter
2007-11-07 3:00 ` Rik van Riel
2007-11-03 23:02 ` [RFC PATCH 7/10] clean up the LRU array arithmetic Rik van Riel
2007-11-03 23:03 ` [RFC PATCH 8/10] make split VM and lumpy reclaim work together Rik van Riel
2007-11-03 23:04 ` [RFC PATCH 9/10] split VM and memory controllers Rik van Riel
2007-11-03 23:06 ` [RFC PATCH 10/10] add swapped in pages to the inactive list Rik van Riel
2007-11-07 2:11 ` [RFC PATCH 0/10] split anon and file LRUs Christoph Lameter
2007-11-07 2:23 ` Rik van Riel
2007-11-07 2:40 ` Christoph Lameter
2007-11-07 2:51 ` Rik van Riel
2007-11-07 17:59 ` Andrew Morton
2007-11-07 18:16 ` Rik van Riel
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