linux-kernel - Re: [RFC] mm:add KPF_ZERO_PAGE flag for /proc/kpageflags

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Message-Id: <20141205143134.37139da2208c654a0d3cd942@linux-foundation.org>
Date:	Fri, 5 Dec 2014 14:31:34 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	"Wang, Yalin" <Yalin.Wang@...ymobile.com>
Cc:	"'Konstantin Khlebnikov'" <koct9i@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"n-horiguchi@...jp.nec.com" <n-horiguchi@...jp.nec.com>
Subject: Re: [RFC] mm:add KPF_ZERO_PAGE flag for /proc/kpageflags

On Fri, 5 Dec 2014 18:22:33 +0800 "Wang, Yalin" <Yalin.Wang@...ymobile.com> wrote:

> > -----Original Message-----
> > From: Konstantin Khlebnikov [mailto:koct9i@...il.com]
> > Sent: Friday, December 05, 2014 5:21 PM
> > To: Wang, Yalin
> > Cc: linux-kernel@...r.kernel.org; linux-mm@...ck.org; linux-arm-
> > kernel@...ts.infradead.org; akpm@...ux-foundation.org; n-
> > horiguchi@...jp.nec.com
> > Subject: Re: [RFC] mm:add KPF_ZERO_PAGE flag for /proc/kpageflags
> > 
> > On Fri, Dec 5, 2014 at 11:57 AM, Wang, Yalin <Yalin.Wang@...ymobile.com>
> > wrote:
> > > This patch add KPF_ZERO_PAGE flag for zero_page, so that userspace
> > > process can notice zero_page from /proc/kpageflags, and then do memory
> > > analysis more accurately.
> > 
> > It would be nice to mark also huge_zero_page. See (completely
> > untested) patch in attachment.
> > 
> Got it,
> Thanks for your patch.

Documentation/vm/pagemap.txt will need updating please.
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