[PATCH 02/18] xstat: Add a pair of system calls to make extended file stats available [ver #6]
dhowells at redhat.com
Sat Jul 31 13:26:49 MDT 2010
utz lehmann <lkml123 at 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?
> 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.
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