From: Kenny Simpson <theonetruekenny@yahoo.com>
To: Benjamin LaHaise <bcrl@redhat.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: mmap-related questions
Date: Tue, 1 Apr 2003 19:18:40 -0800 (PST) [thread overview]
Message-ID: <20030402031840.60077.qmail@web20005.mail.yahoo.com> (raw)
In-Reply-To: <20030401125020.E25225@redhat.com>
--- Benjamin LaHaise <bcrl@redhat.com> wrote:
> the act of unmapping them transfers the
> dirty bit from the page
> tables into the page cache where fsync() acts on
> them.
>
Should this info be included with Mel Gorman's
excellent doc:
http://www.csn.ul.ie/~mel/projects/vm/guide/html/understand/node31.html#SECTION009411000000000000000
Or is it there, but I missed it?
> The
> one case this breaks down
> on is when the mmap()'d file is on NFS -- the
> reordering there can result in
> writebacks from mmap()s occuring in unexpected ways.
I sometimes wish mmap was not supported on NFS, or at
least require a special MAP_NFS flag be used. It has
caused lots of pain over the years.
Thanks again for this info, it has helped greatly!
-Kenny
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next prev parent reply other threads:[~2003-04-02 3:07 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-03-31 14:41 mmap-related questions Kenny Simpson
2003-03-31 17:55 ` Benjamin LaHaise
2003-04-01 3:25 ` Kenny Simpson
2003-04-01 17:50 ` Benjamin LaHaise
2003-04-02 3:18 ` Kenny Simpson [this message]
2003-04-02 9:30 ` Jakob Oestergaard
2003-04-02 15:10 ` Benjamin LaHaise
2003-04-02 23:43 ` Jakob Oestergaard
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