linux-kernel - Re: [Q] missing unused dentry in prune

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Date:	Thu, 26 Oct 2006 15:07:32 +0100
From:	David Howells <dhowells@...hat.com>
To:	Vasily Averin <vvs@...ru>
Cc:	aviro@...hat.com, Neil Brown <neilb@...e.de>,
	Jan Blunck <jblunck@...e.de>, Olaf Hering <olh@...e.de>,
	Balbir Singh <balbir@...ibm.com>,
	Kirill Korotaev <dev@...nvz.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	devel@...nvz.org, Andrew Morton <akpm@...l.org>
Subject: Re: [Q] missing unused dentry in prune_dcache()? 

Vasily Averin <vvs@...ru> wrote:

> I would note that in first two hunks you have decremented
> dentry_stat.nr_unused correctly, under dcache_lock. Probably it's better to
> count freed dentries only in third case and corrects dentry_stat.nr_unused
> value inside shrink_dcache_for_umount_subtree() function before return.

Maybe, maybe not.  This way we only touch the dentry_stat cacheline once, if
at all.  I'm not sure it'd make much difference though.

David
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