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From: David Howells on 31 Jul 2010 15:30
utz lehmann <lkml123(a)s2y4n2c.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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