linux-kernel - Re: rename() contention (BUG?)

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Message-ID: <20061026192219.GL29920@ftp.linux.org.uk>
Date:	Thu, 26 Oct 2006 20:22:20 +0100
From:	Al Viro <viro@....linux.org.uk>
To:	Avi Kivity <avi@...o.co.il>
Cc:	Josef Sipek <jsipek@....cs.sunysb.edu>, lkml@...garu.com,
	linux-kernel@...r.kernel.org
Subject: Re: rename() contention (BUG?)

On Thu, Oct 26, 2006 at 08:43:34PM +0200, Avi Kivity wrote:
> The changes make the mutex more efficient, but won't decrease the 
> contention.  It seems that all renames in one filesystem are serialized, 
> and if the renames require I/O (which is certainly the case with nfs), 
> rename throughput is severely limited.

	They are, and for a good reason.  For details see
Documentation/filesystems/directory-locking.

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