linux-kernel - Re: RFC: Fix f_flags races without the BKL

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Message-ID: <20081230145555.GN496@one.firstfloor.org>
Date:	Tue, 30 Dec 2008 15:55:55 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Jonathan Corbet <corbet@....net>
Cc:	Andi Kleen <andi@...stfloor.org>, Oleg Nesterov <oleg@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Al Viro <viro@...IV.linux.org.uk>, bfields@...ldses.org,
	xfs-masters@....sgi.com
Subject: Re: RFC: Fix f_flags races without the BKL

On Tue, Dec 30, 2008 at 05:59:56AM -0700, Jonathan Corbet wrote:
> On Mon, 29 Dec 2008 16:27:32 +0100
> Andi Kleen <andi@...stfloor.org> wrote:
> 
> > I would prefer O_LOCK_FLAGS bit too. The global lock is not very nice
> > and I don't doubt someone will come up with a workload which
> > pounds on it.
> 
> Seems hard to imagine that it would be worse than the longstanding BKL
> situation.  

As long as noone else uses it too BKL is faster than a mutex.

-Andi

-- 
ak@...ux.intel.com
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