From: Peter Zijlstra <peterz@infradead.org>
To: Minchan Kim <minchan.kim@gmail.com>
Cc: Jamie Lokier <jamie@shareable.org>,
uClinux development list <uclinux-dev@uclinux.org>,
Andrew Morton <akpm@linux-foundation.org>,
David Howells <dhowells@redhat.com>,
torvalds@linux-foundation.org, linux-kernel@vger.kernel.org
Subject: Re: [uClinux-dev] RE: [PATCH] NOMMU: Pages allocated to a ramfs inode's pagecache may get wrongly discarded
Date: Fri, 13 Mar 2009 08:56:25 +0100 [thread overview]
Message-ID: <1236930985.5188.77.camel@laptop> (raw)
In-Reply-To: <20090313082051.5eaa11a3.minchan.kim@barrios-desktop>
On Fri, 2009-03-13 at 08:20 +0900, Minchan Kim wrote:
> > > Does the vm pageout logic include or skip these "dirty" pages looking
> > > for candidates to flush to storage? What about with MMU?
> >
> > Includes them, regular pageout will try to do the writeout to clean them
> > and then discard them.
> >
> > The ramfs stuff is rather icky in that it adds the pages to the aging
> > list, marks them dirty, but does not provide a writeout method.
> >
> > This will make the paging code scan over them (continuously) trying to
> > clean them, failing that (lack of writeout method) and putting them back
> > on the list.
>
> It ins't true any more.
> UNEVICTABLE_LRU will move ramfs's page from LRU to unevictable list.
> Couldn't we solve this problem if NOMMU can support CONFIG_UNEVICTABLE_LRU ?
That's more of a band-aid than a solution, no? They should never have
been on the list to begin with.
next prev parent reply other threads:[~2009-03-13 7:57 UTC|newest]
Thread overview: 59+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-03-11 15:30 David Howells
2009-03-11 17:26 ` Johannes Weiner
2009-03-11 22:03 ` Andrew Morton
2009-03-11 22:36 ` Johannes Weiner
2009-03-12 0:02 ` Andrew Morton
2009-03-12 0:35 ` Minchan Kim
2009-03-12 1:04 ` KOSAKI Motohiro
2009-03-12 1:52 ` Minchan Kim
2009-03-12 1:56 ` Minchan Kim
2009-03-12 2:00 ` KOSAKI Motohiro
2009-03-12 2:11 ` Minchan Kim
2009-03-12 12:19 ` Robin Getz
2009-03-12 17:55 ` [uClinux-dev] " Jamie Lokier
2009-03-13 17:33 ` [PATCH 0/2] Make the Unevictable LRU available on NOMMU David Howells
2009-03-13 17:33 ` [PATCH 1/2] NOMMU: There is no mlock() for NOMMU, so don't provide the bits David Howells
2009-03-14 11:17 ` KOSAKI Motohiro
2009-03-13 17:33 ` [PATCH 2/2] NOMMU: Make CONFIG_UNEVICTABLE_LRU available when CONFIG_MMU=n David Howells
2009-03-14 11:17 ` KOSAKI Motohiro
2009-03-14 0:27 ` [PATCH 0/2] Make the Unevictable LRU available on NOMMU Minchan Kim
2009-03-20 16:08 ` Lee Schermerhorn
2009-03-20 16:24 ` David Howells
2009-03-20 18:30 ` Lee Schermerhorn
2009-03-21 10:20 ` Johannes Weiner
2009-03-22 20:13 ` [patch 1/3] mm: decouple unevictable lru from mmu Johannes Weiner
2009-03-22 23:46 ` KOSAKI Motohiro
2009-03-23 0:14 ` Johannes Weiner
2009-03-23 10:48 ` David Howells
2009-03-22 20:13 ` [patch 2/3] ramfs-nommu: use generic lru cache Johannes Weiner
2009-03-23 2:22 ` KOSAKI Motohiro
2009-03-22 20:13 ` [patch 3/3] mm: keep pages from unevictable mappings off the LRU lists Johannes Weiner
2009-03-23 0:44 ` Minchan Kim
2009-03-23 2:21 ` KOSAKI Motohiro
2009-03-23 8:42 ` Johannes Weiner
2009-03-23 9:01 ` KOSAKI Motohiro
2009-03-23 9:23 ` KOSAKI Motohiro
2009-03-26 0:48 ` Johannes Weiner
2009-03-23 10:40 ` [patch 2/3] ramfs-nommu: use generic lru cache David Howells
2009-03-23 10:53 ` [patch 3/3] mm: keep pages from unevictable mappings off the LRU lists David Howells
2009-03-26 0:01 ` Johannes Weiner
2009-03-26 8:56 ` KOSAKI Motohiro
2009-03-26 10:36 ` Johannes Weiner
2009-03-23 20:07 ` [PATCH 0/2] Make the Unevictable LRU available on NOMMU Lee Schermerhorn
2009-03-13 11:53 ` [PATCH] NOMMU: Pages allocated to a ramfs inode's pagecache may get wrongly discarded David Howells
2009-03-13 22:49 ` Johannes Weiner
2009-03-12 0:08 ` Andrew Morton
2009-03-12 7:12 ` Berkhan, Enrik (GE Infra, Oil & Gas)
2009-03-12 11:29 ` [uClinux-dev] " Jamie Lokier
2009-03-12 11:50 ` Peter Zijlstra
2009-03-12 23:20 ` Minchan Kim
2009-03-13 7:56 ` Peter Zijlstra [this message]
2009-03-13 9:17 ` Minchan Kim
2009-03-12 12:25 ` David Howells
2009-03-12 19:43 ` Andrew Morton
2009-03-13 2:03 ` KOSAKI Motohiro
2009-03-13 7:57 ` Peter Zijlstra
2009-03-13 8:15 ` KOSAKI Motohiro
2009-03-13 9:19 ` Minchan Kim
2009-03-13 10:44 ` Johannes Weiner
2009-03-14 14:29 ` KOSAKI Motohiro
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