linux-kernel - Re: [PATCH 02/18] xstat: Add a pair of system calls to make extended file stats available [ver #6]

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Message-ID: <5618.1280604409@redhat.com>
Date:	Sat, 31 Jul 2010 20:26:49 +0100
From:	David Howells <dhowells@...hat.com>
To:	utz lehmann <lkml123@...4n2c.de>
Cc:	dhowells@...hat.com,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Jeremy Allison <jra@...ba.org>, Volker.Lendecke@...net.de,
	Jan Engelhardt <jengelh@...ozas.de>,
	linux-cifs@...r.kernel.org, linux-nfs@...r.kernel.org,
	samba-technical@...ts.samba.org, linux-kernel@...r.kernel.org,
	viro@...iv.linux.org.uk, linux-fsde@...per.es
Subject: Re: [PATCH 02/18] xstat: Add a pair of system calls to make extended file stats available [ver #6]

utz lehmann <lkml123@...4n2c.de> wrote:

> How does this works right with noatime or relatime (which is default)?

Don't do that then.

> We had used FS-Cache with a few 10000s files cached. Doesn't it mean
> that the cleanup has to stat them all?

Yes.

> Why didn't cachefilesd managed the cache index in a separate database
> like other caches?

Because using atime is much simpler since the filesystem updates it
automatically.  If you have a separate database then you have redundant
information and you need to maintain metadata integrity which has a cost, both
in terms of disk usage and performance.  I'm working on it, but you don't get
it for free.

David
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