From: Ross Biro <ross.biro@gmail.com>
To: Jamie Lokier <jamie@shareable.org>
Cc: andersen@codepoet.org, "Pavel Machek" <pavel@ucw.cz>
Subject: Re: [PATCH] cowlinks v2
Date: Fri, 2 Apr 2004 19:55:08 -0800 [thread overview]
Message-ID: <2902D580.68763FDD@mail.gmail.com> (raw)
In-Reply-To: 20040403015920.GA2857@mail.shareable.org
On Sat, 3 Apr 2004 02:59:20 +0100, Jamie Lokier <jamie@shareable.org> wrote:
>
> Erik Andersen wrote:
> > > Here's a tricky situation:
> > >
> > > 1. A file is cowlinked. Then each cowlink is mmap()'d, one per process.
> > >
> > > 2. At this point both mappings share the same pages in RAM.
> > >
> > > 3. Then one of the cowlinks is written to...
> >
> > Using mmap with PROT_WRITE on a cowlink must preemptively
> > break the link.
>
> I forget to mention, they are PROT_READ shared mappings.
Or just also make the page cow and not break the link until someone
actually writes to it. Really depends on how you view the performance
impact, whether you do cow at the block of inode level, and how much
you want to touch (or copy parts of) the mm.
next prev parent reply other threads:[~2004-04-03 3:55 UTC|newest]
Thread overview: 95+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-03-20 8:34 [PATCH] cowlinks v2 Jörn Engel
2004-03-20 8:49 ` Andrew Morton
2004-03-20 11:27 ` Jörn Engel
2004-03-20 19:28 ` Andrew Morton
2004-03-21 12:43 ` Jörn Engel
2004-03-21 18:53 ` Jörn Engel
[not found] ` <mit.lcs.mail.linux-kernel/20040320083411.GA25934@wohnheim.fh-wedel.de>
2004-03-20 15:03 ` Patrick J. LoPresti
2004-03-20 15:23 ` Jörn Engel
2004-03-29 17:12 ` Pavel Machek
2004-03-29 21:05 ` Patrick J. LoPresti
2004-03-29 23:16 ` Pavel Machek
2004-03-31 14:34 ` Jamie Lokier
2004-03-31 14:45 ` Pavel Machek
2004-03-31 15:20 ` Jamie Lokier
2004-04-02 11:44 ` Tim Connors
2004-04-02 16:54 ` Jörn Engel
2004-04-02 18:01 ` Pavel Machek
2004-04-02 18:17 ` Jörn Engel
2004-04-02 18:23 ` Pavel Machek
2004-04-02 19:28 ` Ross Biro
2004-04-02 21:35 ` Pavel Machek
2004-04-05 8:12 ` Jörn Engel
2004-04-05 8:19 ` Pavel Machek
2004-04-05 8:45 ` Jörn Engel
2004-04-02 20:09 ` Jamie Lokier
2004-04-02 21:39 ` Pavel Machek
2004-04-02 22:00 ` Chris Friesen
2004-04-03 0:49 ` Jamie Lokier
2004-04-03 8:23 ` Pavel Machek
2004-04-03 13:15 ` Jamie Lokier
2004-04-05 8:19 ` Jörn Engel
2004-04-05 8:22 ` Pavel Machek
2004-04-03 0:46 ` Jamie Lokier
2004-04-03 1:04 ` Jamie Lokier
2004-04-03 1:21 ` Erik Andersen
2004-04-03 1:59 ` Jamie Lokier
2004-04-03 3:55 ` Ross Biro [this message]
2004-04-03 9:09 ` Pavel Machek
2004-04-03 13:27 ` Jamie Lokier
2004-04-03 18:39 ` Eric W. Biederman
2004-04-03 19:43 ` Jamie Lokier
2004-04-03 20:30 ` Eric W. Biederman
2004-04-03 21:59 ` Jamie Lokier
2004-04-04 8:15 ` Eric W. Biederman
2004-04-05 8:35 ` Jörn Engel
2004-04-05 9:15 ` Eric W. Biederman
2004-04-05 9:18 ` Jörn Engel
2004-04-05 11:43 ` Pavel Machek
2004-04-05 12:17 ` Jamie Lokier
2004-04-05 12:39 ` Jamie Lokier
2004-04-05 12:41 ` Jamie Lokier
2004-04-05 18:03 ` Jörn Engel
2004-04-05 11:10 ` jlnance
2004-04-05 11:46 ` Pavel Machek
2004-04-05 12:35 ` Jamie Lokier
2004-04-05 8:43 ` Jörn Engel
2004-04-03 19:47 ` Eric W. Biederman
2004-04-05 8:54 ` Jörn Engel
2004-04-05 9:07 ` Eric W. Biederman
2004-03-20 16:48 ` Davide Libenzi
2004-03-21 12:57 ` Jörn Engel
2004-03-21 17:59 ` Davide Libenzi
2004-03-21 18:14 ` Jörn Engel
2004-03-21 20:26 ` Davide Libenzi
2004-03-21 20:35 ` Jörn Engel
2004-03-22 0:18 ` Eric W. Biederman
2004-03-22 0:25 ` Davide Libenzi
2004-03-22 5:07 ` Eric W. Biederman
2004-03-22 5:11 ` Davide Libenzi
2004-03-22 11:20 ` Eric W. Biederman
2004-03-22 16:02 ` Davide Libenzi
2004-03-25 17:49 ` Jamie Lokier
2004-03-25 18:06 ` Eric W. Biederman
2004-03-25 19:43 ` Jamie Lokier
2004-03-25 20:38 ` Linus Torvalds
2004-03-25 22:16 ` Eric W. Biederman
2004-04-01 14:53 ` Jörn Engel
2004-04-02 11:54 ` Tim Connors
2004-03-25 21:46 ` Eric W. Biederman
2004-03-27 10:28 ` Jamie Lokier
2004-03-27 21:00 ` Eric W. Biederman
2004-03-27 21:42 ` Jamie Lokier
2004-03-27 23:45 ` Eric W. Biederman
2004-03-28 0:43 ` Eric W. Biederman
2004-03-28 12:22 ` Jamie Lokier
2004-03-28 20:07 ` Eric W. Biederman
2004-03-28 23:55 ` Jamie Lokier
2004-03-29 1:31 ` Eric W. Biederman
2004-03-29 12:36 ` Jamie Lokier
2004-03-29 19:36 ` Eric W. Biederman
2004-03-29 23:05 ` Jamie Lokier
2004-03-29 23:58 ` Eric W. Biederman
2004-03-29 7:45 ` Denis Vlasenko
2004-03-29 9:28 ` Pavel Machek
2004-03-29 12:40 ` Jamie Lokier
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