linux-kernel - Re: [PATCH 2.6.19-rc3] VFS: per-sb dentry lru list

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Message-Id: <20061027110645.b906839f.akpm@osdl.org>
Date:	Fri, 27 Oct 2006 11:06:45 -0700
From:	Andrew Morton <akpm@...l.org>
To:	Vasily Averin <vvs@...ru>
Cc:	David Howells <dhowells@...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
Subject: Re: [PATCH 2.6.19-rc3] VFS: per-sb dentry lru list

On Fri, 27 Oct 2006 18:05:50 +0400
Vasily Averin <vvs@...ru> wrote:

> Virtuozzo/OpenVZ linux kernel team has discovered that umount/remount can last
> for hours looping in shrink_dcache_sb() without much successes. Since during
> shrinking s_umount semaphore is taken lots of other unrelated operations like
> sync can stop working until shrink finished.

Did you consider altering shrink_dcache_sb() so that it holds onto
dcache_lock and moves all the to-be-pruned dentries onto a private list in
a single pass, then prunes them all outside the lock?

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