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Date: Tue, 8 Jul 2014 09:27:55 -0400
From: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Subject: Re: [PATCH v3 0/3] mm: introduce fincore() v3
Message-ID: <20140708132755.GA24698@nhori>
References: <1404756006-23794-1-git-send-email-n-horiguchi@ah.jp.nec.com>
 <20140708121618.GA2554@infradead.org>
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Sender: owner-linux-mm@kvack.org
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To: Christoph Hellwig <hch@infradead.org>
Cc: Andrew Morton <akpm@linux-foundation.org>, Konstantin Khlebnikov <koct9i@gmail.com>, Wu Fengguang <fengguang.wu@intel.com>, Arnaldo Carvalho de Melo <acme@redhat.com>, Borislav Petkov <bp@alien8.de>, "Kirill A. Shutemov" <kirill@shutemov.name>, Johannes Weiner <hannes@cmpxchg.org>, Rusty Russell <rusty@rustcorp.com.au>, David Miller <davem@davemloft.net>, Andres Freund <andres@2ndquadrant.com>, linux-kernel@vger.kernel.org, linux-mm@kvack.org, Dave Hansen <dave.hansen@intel.com>, Dave Chinner <david@fromorbit.com>, Michael Kerrisk <mtk.manpages@gmail.com>, Linux API <linux-api@vger.kernel.org>, Naoya Horiguchi <nao.horiguchi@gmail.com>

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?

Thanks,
Naoya Horiguchi

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