From: Andrea Arcangeli <andrea@suse.de>
To: Hugh Dickins <hugh@veritas.com>
Cc: Dan Aloni <da-x@monatomic.org>, Nick Piggin <npiggin@suse.de>,
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 17:34:51 +0200 [thread overview]
Message-ID: <20070404153451.GH19587@v2.random> (raw)
In-Reply-To: <Pine.LNX.4.64.0704041553220.18202@blonde.wat.veritas.com>
On Wed, Apr 04, 2007 at 04:03:15PM +0100, Hugh Dickins wrote:
> Maybe Nick will decide to not to mark the readfaults as dirty.
I don't like to mark the pte readonly and clean, we'd be still
optimizing for the current ZERO_PAGE users and even for those it would
generate a unnecessary page fault if they later write to it. If any
legitimate ZERO_PAGE user really exists, then we should keep mapping
the ZERO_PAGE into it and fix the scalability issue associated with
it, instead of allocating a new page in readonly mode.
Marking anonymous pages readonly and clean so they can be collected
w/o swapping still is desiderable for glibc through madvise (madvise
would later need to be called again before starting using the
collectable anon pages to store information into it), but that's
an entirely different topic ;)
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next prev parent reply other threads:[~2007-04-04 15:34 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
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 [this message]
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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