From: Olaf Kirch <okir@suse.de>
To: Trond Myklebust <trond.myklebust@fys.uio.no>
Cc: nfs@lists.sourceforge.net
Subject: Re: NFS direct IO needs page lock?
Date: Thu, 17 Feb 2005 16:34:51 +0100 [thread overview]
Message-ID: <20050217153451.GL23564@suse.de> (raw)
In-Reply-To: <1108507882.10073.236.camel@lade.trondhjem.org>
On Tue, Feb 15, 2005 at 05:51:22PM -0500, Trond Myklebust wrote:
> ty den 15.02.2005 Klokka 21:36 (+0100) skreiv Olaf Kirch:
> It is intentional. Andrew Morton pointed out that you can play zero-copy
> tricks by doing direct-io on an mmapped range of pages (as seems to be
> the case above).
>
> That could cause deadlocks if the reader and writer were to both try to
> lock the same page.
Thanks, that helps!
Olaf
--
Olaf Kirch | --- o --- Nous sommes du soleil we love when we play
okir@suse.de | / | \ sol.dhoop.naytheet.ah kin.ir.samse.qurax
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prev parent reply other threads:[~2005-02-17 15:35 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-02-15 20:36 NFS direct IO needs page lock? Olaf Kirch
2005-02-15 22:51 ` Trond Myklebust
2005-02-17 15:34 ` Olaf Kirch [this message]
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