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SubjectRe: [PATCH v2 2/4] mm: introduce fincore()
On Thu, Jul 03, 2014 at 05:52:13PM -0400, Naoya Horiguchi wrote:
> This patch provides a new system call fincore(2), which provides mincore()-
> like information, i.e. page residency of a given file. But unlike mincore(),
> fincore() has a mode flag which allows us to extract detailed information
> about page cache like pfn and page flag. This kind of information is very
> helpful, for example when applications want to know the file cache status
> to control the IO on their own way.

It's still a nasty multiplexer for multiple different reporting formats
in a single system call. How about your really just do a fincore that
mirrors mincore instead of piggybacking exports of various internal
flags (tags and page flags onto it.

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