From: Johannes Weiner <hannes@cmpxchg.org>
To: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
Cc: David Howells <dhowells@redhat.com>,
Minchan Kim <minchan.kim@gmail.com>,
Andrew Morton <akpm@linux-foundation.org>,
kosaki.motohiro@jp.fujitsu.com, torvalds@linux-foundation.org,
peterz@infradead.org, nrik.Berkhan@ge.com,
uclinux-dev@uclinux.org, linux-kernel@vger.kernel.org,
linux-mm@kvack.org, riel@surriel.com
Subject: Re: [PATCH 0/2] Make the Unevictable LRU available on NOMMU
Date: Sat, 21 Mar 2009 11:20:44 +0100 [thread overview]
Message-ID: <20090321102044.GA3427@cmpxchg.org> (raw)
In-Reply-To: <1237573815.27431.122.camel@lts-notebook>
On Fri, Mar 20, 2009 at 02:30:15PM -0400, Lee Schermerhorn wrote:
> On Fri, 2009-03-20 at 16:24 +0000, David Howells wrote:
> > Lee Schermerhorn <Lee.Schermerhorn@hp.com> wrote:
> >
> > > I just want to point out [again :)] that removing the ramfs pages from
> > > the lru will prevent them from being migrated
> >
> > This is less of an issue for NOMMU kernels, since you can't migrate pages that
> > are mapped.
>
>
> Agreed. So, you could eliminate them [ramfs pages] from the lru for
> just the nommu kernels, if you wanted to go that route.
These pages don't come with much overhead anymore when they sit on the
unevictable list, right? So I don't see much point in special casing
them all over the place.
I have a patchset that decouples the unevictable lru feature from
mlock, enables the latter on nommu and then makes sure ramfs pages go
immediately to the unevictable list so they don't need the scanner to
move them. This is just wiring up of features we already have.
I will sent this mondayish, need to test it more especially on a NOMMU
setup.
Hannes
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next prev parent reply other threads:[~2009-03-21 10:04 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20090311153034.9389.19938.stgit@warthog.procyon.org.uk>
2009-03-11 22:03 ` [PATCH] NOMMU: Pages allocated to a ramfs inode's pagecache may get wrongly discarded 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 [this message]
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
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