From: Dan Aloni <da-x@monatomic.org>
To: Andrea Arcangeli <andrea@suse.de>
Cc: Nick Piggin <npiggin@suse.de>, Hugh Dickins <hugh@veritas.com>,
Andrew Morton <akpm@linux-foundation.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
Linux Memory Management List <linux-mm@kvack.org>,
tee@sgi.com, holt@sgi.com,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [rfc] no ZERO_PAGE?
Date: Wed, 4 Apr 2007 16:55:32 +0300 [thread overview]
Message-ID: <20070404135530.GA29026@localdomain> (raw)
In-Reply-To: <20070404122701.GB19587@v2.random>
On Wed, Apr 04, 2007 at 02:27:01PM +0200, Andrea Arcangeli wrote:
> On Wed, Apr 04, 2007 at 12:24:07PM +0200, Nick Piggin wrote:
> > But for a potential mainline merge, maybe starting with a CONFIG
> > option is a good idea -- defaulting to off, and we could start by
> > turning it on just in -rc kernels for a few releases, to get a bit
> > more confidence?
>
> The only reason to do that is if there are many stupid apps pretending
> to get meaningful information from pages that cannot contain any
> information. The zero page in the anon page fault has been there
> forever so...
There might be a lot of applications like that, and I'm not sure that
_all_ of them can be considered 'stupid' as you say.
How about applications that perform mmap() and R/W random-access on
large *sparse* files? (e.g. a scientific app that uses a large sparse
file as a big database look-up table). As I see it, these apps would
need to keep track of what's sparse and what's not...
--
Dan Aloni
XIV LTD, http://www.xivstorage.com
da-x (at) monatomic.org, dan (at) xiv.co.il
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next prev parent reply other threads:[~2007-04-04 13:55 UTC|newest]
Thread overview: 49+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-03-29 7:58 [rfc][patch 1/2] mm: dont account ZERO_PAGE Nick Piggin
2007-03-29 7:58 ` [rfc][patch 2/2] mips: reinstate move_pte Nick Piggin
2007-03-29 17:49 ` Linus Torvalds
2007-03-29 13:10 ` [rfc][patch 1/2] mm: dont account ZERO_PAGE Hugh Dickins
2007-03-30 1:46 ` Nick Piggin
2007-03-30 2:59 ` Robin Holt
2007-03-30 3:09 ` Nick Piggin
2007-03-30 9:23 ` Robin Holt
2007-03-30 2:40 ` Nick Piggin
2007-04-04 3:37 ` [rfc] no ZERO_PAGE? Nick Piggin
2007-04-04 9:45 ` Hugh Dickins
2007-04-04 10:24 ` Nick Piggin
2007-04-04 12:27 ` Andrea Arcangeli
2007-04-04 13:55 ` Dan Aloni [this message]
2007-04-04 14:14 ` Andrea Arcangeli
2007-04-04 14:44 ` Dan Aloni
2007-04-04 15:03 ` Hugh Dickins
2007-04-04 15:34 ` Andrea Arcangeli
2007-04-04 15:41 ` Hugh Dickins
2007-04-04 16:07 ` Andrea Arcangeli
2007-04-04 16:14 ` Linus Torvalds
2007-04-04 15:27 ` Andrea Arcangeli
2007-04-04 16:15 ` Dan Aloni
2007-04-04 16:48 ` Andrea Arcangeli
2007-04-04 12:45 ` Hugh Dickins
2007-04-04 13:05 ` Andrea Arcangeli
2007-04-04 13:32 ` Hugh Dickins
2007-04-04 13:40 ` Andrea Arcangeli
2007-04-04 15:35 ` Linus Torvalds
2007-04-04 15:48 ` Andrea Arcangeli
2007-04-04 16:09 ` Linus Torvalds
2007-04-04 16:23 ` Andrea Arcangeli
2007-04-04 16:10 ` Hugh Dickins
2007-04-04 16:31 ` Andrea Arcangeli
2007-04-04 22:07 ` Valdis.Kletnieks
2007-04-04 16:32 ` Eric Dumazet
2007-04-04 17:02 ` Linus Torvalds
2007-04-04 19:15 ` Andrew Morton
2007-04-04 20:11 ` David Miller, Linus Torvalds
2007-04-04 20:50 ` Andrew Morton
2007-04-05 2:03 ` Nick Piggin
2007-04-05 5:23 ` Andrea Arcangeli
2007-04-04 22:05 ` Valdis.Kletnieks
2007-04-05 0:27 ` Linus Torvalds
2007-04-05 1:25 ` Valdis.Kletnieks
2007-04-05 2:30 ` Nick Piggin
2007-04-05 5:37 ` William Lee Irwin III
2007-04-05 17:23 ` Valdis.Kletnieks
2007-04-05 4:47 ` Nick Piggin
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