linux-kernel - Re: [PATCH 0/4] dcache: make Oracle more scalable on large systems

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Message-ID: <20130221233818.GM26694@dastard>
Date:	Fri, 22 Feb 2013 10:38:18 +1100
From:	Dave Chinner <david@...morbit.com>
To:	Waiman Long <Waiman.Long@...com>
Cc:	linux-fsdevel@...r.kernel.org,
	Alexander Viro <viro@...iv.linux.org.uk>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/4] dcache: make Oracle more scalable on large systems

On Tue, Feb 19, 2013 at 01:50:55PM -0500, Waiman Long wrote:
> It was found that the Oracle database software issues a lot of call
> to the seq_path() kernel function which translates a (dentry, mnt)
> pair to an absolute path. The seq_path() function will eventually
> take the following two locks:

Nobody should be doing reverse dentry-to-name lookups in a quantity
sufficient for it to become a performance limiting factor. What is
the Oracle DB actually using this path for?

Cheers,

Dave.
-- 
Dave Chinner
david@...morbit.com
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