Re: [patch 1/2] mm: fincore()

[Andrew Morton]

On Fri, 15 Feb 2013 17:28:03 -0500
Johannes Weiner <hannes@xxxxxxxxxxx> wrote:

> > Yes, and there will be immediate calmour to add more goodies to the
> > other seven bits.  PageDirty, referenced state, etc.  We should think
> > about this now, at the design stage rather than grafting things on
> > later.
> 
> I'm interested in your "etc.".  PG_error, PG_active, PG_writeback,
> page huge?

Gawd knows.  How many crazy people are there out there?

If we adopt my use-runlength-encoding suggestion then things get
easier.  We add an extra arg to the syscall which selects which
particular per-page boolean we're looking for and can gather up to 4
billion different PageFoo()s.

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