From: Jamie Lokier <jamie@shareable.org>
To: "Jörn Engel" <joern@wohnheim.fh-wedel.de>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>,
Pavel Machek <pavel@ucw.cz>,
mj@ucw.cz, jack@ucw.cz,
"Patrick J. LoPresti" <patl@users.sourceforge.net>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] cowlinks v2
Date: Mon, 5 Apr 2004 13:41:58 +0100 [thread overview]
Message-ID: <20040405124158.GD19842@mail.shareable.org> (raw)
In-Reply-To: <20040405083549.GD28924@wohnheim.fh-wedel.de>
Jörn Engel wrote:
> Sharing the page cache is more important to me than sharing disk
> space. Disk space is cheap, but increasing memory beyond 1GiB in my
> notebook is not and 1GiB is too little, so memory is the real
> constraint.
Lucky you! I have 192MB, that's as much as it can take.
> And it looks like Pavel already found the solution. Whenever doing
> something fishy that would confuse the page cache, we
> 1. lock
> 2. invalidate page cache for all files belonging to that cow entity
> 3. copyfile(), write(), or whatever
> 4. unlock
>
> This is always possibly, because page cache for cow-files is never
> read-write. If it was, we would have done 1-4 before and now have a
> regular (non-cow) file.
>
> Did I miss something?
Just some interesting indirection or substitution of address_space
objects needed in the vmas, to map the right pages.
-- Jamie
next prev parent reply other threads:[~2004-04-05 12:45 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
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 [this message]
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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