Re: [PATCH 06/45] FS-Cache: Recruit a couple of page flags for cache management [ver #41]

[David Howells]

Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> wrote:

> ow, that hurt.  Every time someone does this I ask "how many are left"
> but nobody seems to know how to work it out.

Yeah, that worries me a bit too.  That why we looked at reclaiming PG_private.
The patches to do that didn't appear to be interesting, however.

> How many are left?

It depends on the configuration, but with maximum usage, 24 are used, except
on IA64 where 25 are used.

> I'd suggest that we make PagePrivate() go away completely, to prevent
> accidental usages from sneaking back in.  If that's practical.

Well, there are still some places where PG_private does need to be checked
individually.

David
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