linux-kernel - Re: [PATCH v3 0/3] mm: introduce fincore() v3

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Message-ID: <20140709085159.GA10693@infradead.org>
Date:	Wed, 9 Jul 2014 01:51:59 -0700
From:	Christoph Hellwig <hch@...radead.org>
To:	Naoya Horiguchi <n-horiguchi@...jp.nec.com>
Cc:	Christoph Hellwig <hch@...radead.org>,
	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>,
	Dave Chinner <david@...morbit.com>,
	Michael Kerrisk <mtk.manpages@...il.com>,
	Linux API <linux-api@...r.kernel.org>,
	Naoya Horiguchi <nao.horiguchi@...il.com>
Subject: Re: [PATCH v3 0/3] mm: introduce fincore() v3

On Tue, Jul 08, 2014 at 09:27:55AM -0400, Naoya Horiguchi wrote:
> On Tue, Jul 08, 2014 at 05:16:18AM -0700, Christoph Hellwig wrote:
> > Still a hard NAK for exposing page flags in a syscall ABI.  These are
> > way to volatile to go into an application interface.
> 
> Is there any specific reason that exporting via syscall ABI is more
> volatile than exporting via procfs as /proc/kpageflags alreadly does?

An optional proc debug output is very different from an actual system
call.

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