linux-kernel - Re: [PATCH v2 2/4] mm: introduce fincore()

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Date:	Fri, 4 Jul 2014 03:12:30 -0700
From:	Christoph Hellwig <hch@...radead.org>
To:	Naoya Horiguchi <n-horiguchi@...jp.nec.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Konstantin Khlebnikov <koct9i@...il.com>,
	Wu Fengguang <fengguang.wu@...el.com>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Borislav Petkov <bp@...en8.de>,
	"Kirill A. Shutemov" <kirill@...temov.name>,
	Johannes Weiner <hannes@...xchg.org>,
	Rusty Russell <rusty@...tcorp.com.au>,
	David Miller <davem@...emloft.net>,
	Andres Freund <andres@...quadrant.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Dave Hansen <dave.hansen@...el.com>,
	Christoph Hellwig <hch@...radead.org>,
	Michael Kerrisk <mtk.manpages@...il.com>,
	Linux API <linux-api@...r.kernel.org>,
	Naoya Horiguchi <nao.horiguchi@...il.com>
Subject: Re: [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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