From: Matthew Wilcox <willy@debian.org>
To: Mark B <mark@lemna.hr>
Cc: Matthew Wilcox <willy@debian.org>, linux-fsdevel@vger.kernel.org
Subject: Re: same page access
Date: Wed, 22 Oct 2003 18:10:32 +0100 [thread overview]
Message-ID: <20031022171032.GS18370@parcelfarce.linux.theplanet.co.uk> (raw)
In-Reply-To: <200310221909.58066.mark@lemna.hr>
On Wed, Oct 22, 2003 at 07:09:58PM +0200, Mark B wrote:
> Mmm sorry I formulated the question a bit wrong, here's the correction;
> I know that the data what was read() before the write() can't be affected,
> it's a perfectly normal condition, but I'm talking about the page of data the
> kernel loaded in the VFS for that file handle, is the data the same copy of
> data that is served to other processes? So a read() by P1 after P2 has did a
> write() in the same area, will it lead to a reload of the page since the P2
> marked the area dirty? Or simply they're working on the same memory page? Is
> there any locking (by commit_write()?)
They're working from the same memory page (in the page cache). This same
page is also shared with any process that has a shared mmap.
--
"It's not Hollywood. War is real, war is primarily not about defeat or
victory, it is about death. I've seen thousands and thousands of dead bodies.
Do you think I want to have an academic debate on this subject?" -- Robert Fisk
next prev parent reply other threads:[~2003-10-22 17:10 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-10-07 19:02 zeroes read back more often than appended Pat LaVarre
2003-10-07 20:54 ` Pat LaVarre
2003-10-08 3:49 ` Ben Fennema
2003-10-08 16:41 ` Pat LaVarre
2003-10-08 16:47 ` editable udf metadata Pat LaVarre
2003-10-08 17:51 ` Pat LaVarre
2003-10-08 18:09 ` big-endian udfct_1_0r2 Pat LaVarre
2003-10-08 18:30 ` Matthew Wilcox
[not found] ` <3F8472FE.9040403@lougher.demon.co.uk>
2003-10-08 19:49 ` Matthew Wilcox
2003-10-08 20:43 ` Phillip Lougher
2003-10-21 21:54 ` editable udf metadata Pat LaVarre
2003-10-21 23:17 ` Pat LaVarre
2003-10-23 16:06 ` Pat LaVarre
2003-10-24 21:40 ` Pat LaVarre
2003-10-22 8:15 ` same page access Mark B
2003-10-22 11:21 ` Matthew Wilcox
2003-10-22 17:09 ` Mark B
2003-10-22 17:10 ` Matthew Wilcox [this message]
2003-10-08 17:02 ` zeroes read back more often than appended Pat LaVarre
2003-10-08 17:06 ` toggling smp clears x86_mce_p4thermal of make xconfig Pat LaVarre
2003-10-08 17:21 ` zeroes read back more often than appended Pat LaVarre
2003-10-08 16:46 ` soft trace of read/write of drivers/block/loop.c Pat LaVarre
2003-10-08 20:32 ` zeroes read back more often than appended Pat LaVarre
2003-10-09 20:54 ` Pat LaVarre
2003-10-10 0:52 ` Pat LaVarre
2003-10-10 16:39 ` Pat LaVarre
2003-10-10 18:15 ` Pat LaVarre
2003-10-14 0:38 ` Pat LaVarre
2003-10-14 1:48 ` Pat LaVarre
2003-10-20 23:20 ` Pat LaVarre
2003-10-21 14:47 ` Pat LaVarre
2003-10-21 16:46 ` Pat LaVarre
2003-10-21 18:44 ` Pat LaVarre
2003-10-23 18:52 ` Pat LaVarre
2003-10-27 21:55 ` Pat LaVarre
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