Re: [PATCH 2/3] mm: introduce fincore()

[Dave Hansen]

On 06/01/2014 10:24 PM, Naoya Horiguchi wrote:
> Detail about the data format being passed to userspace are explained in
> inline comment, but generally in long entry format, we can choose which
> information is extraced flexibly, so you don't have to waste memory by
> extracting unnecessary information. And with FINCORE_SKIP_HOLE flag,
> we can skip hole pages (not on memory,) which makes us avoid a flood of
> meaningless zero entries when calling on extremely large (but only few
> pages of it are loaded on memory) file.

Something similar could be useful for hugetlbfs too.  For a 1GB page,
it's pretty silly to do 2^18 entries which essentially repeat the same
data in an interface like this.
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