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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Date:	Sat, 31 Jul 2010 20:05:21 +0200
From:	utz lehmann <lkml123@...4n2c.de>
To:	David Howells <dhowells@...hat.com>
Cc:	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]

On Sat, 2010-07-31 at 17:53 +0100, David Howells wrote:
> utz lehmann <lkml123@...4n2c.de> wrote:
> 
> > When abusing an existing time stamp use atime not ctime please.
> > ctime has it's uses. atime was just a mistake and is nearly useless.
> 
> CacheFiles currently uses atime to determine least-recently-usedness.

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

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

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


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