On Thu 01-06-17 11:26:08, David Howells wrote:
> Jan Kara <[email protected]> wrote:
>
> > The callback doesn't ever get called. Remove it.
>
> Hmmm... I should perhaps be calling this. I'm not sure why I never did.
>
> At the moment, it doesn't strictly matter as ops on pages marked with
> PG_fscache get ignored if the cache has suffered an I/O error or has been
> withdrawn - but it will incur a performance penalty (the PG_fscache flag is
> checked in the netfs before calling into fscache).
>
> The downside of calling this is that when a cache is removed, fscache would go
> through all the cookies for that cache and iterate over all the pages
> associated with those cookies - which could cause a performance dip in the
> system.
So I know nothing about fscache. If you decide these functions should stay
in as you are going to use them soon, then I can just convert them to the
new API as everything else. What just caught my eye and why I had a more
detailed look is that I didn't understand that 'PAGEVEC_SIZE -
pagevec_count(&pvec)' as a pagevec_lookup() argument since pagevec_count()
should always return 0 at that point?
Honza
--
Jan Kara <[email protected]>
SUSE Labs, CR
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