linux-kernel - Re: [PATCH 12/22] elevate write count files are open()ed

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Message-Id: <20070213095817.d2a8a380.akpm@linux-foundation.org>
Date:	Tue, 13 Feb 2007 09:58:17 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Dave Hansen <hansendc@...ibm.com>
Cc:	linux-kernel@...r.kernel.org, hch@...radead.org
Subject: Re: [PATCH 12/22] elevate write count files are open()ed

> On Tue, 13 Feb 2007 08:58:16 -0800 Dave Hansen <hansendc@...ibm.com> wrote:
> > yipes.  A new mount-wide spin_lock/unlock for each for-writing open() and close().
> > Can we have a microbenchmark on this please?
> 
> Yeah, I'll schedule some dbench time on a NUMA machine.

dbench doesn't do open() a lot.  To assess the worst-case we'd need one
process per cpu camping in an open/close loop.
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