linux-kernel - Re: [PATCH] pagemap: document KPF

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Message-ID: <20090831164151.GB22649@x200.localdomain>
Date:	Mon, 31 Aug 2009 09:41:51 -0700
From:	Chris Wright <chrisw@...hat.com>
To:	Wu Fengguang <fengguang.wu@...el.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Josh Triplett <josh@...htriplett.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Andi Kleen <andi@...stfloor.org>,
	Nick Piggin <nickpiggin@...oo.com.au>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Hugh Dickins <hugh.dickins@...cali.co.uk>,
	Chris Wright <chrisw@...hat.com>,
	Izik Eidus <ieidus@...hat.com>
Subject: Re: [PATCH] pagemap: document KPF_KSM and show it in page-types

* Wu Fengguang (fengguang.wu@...el.com) wrote:
> It indicates to the system admin that processes mapping such pages may be
> eating less physical memory than the reported numbers by legacy tools.
> 
> CC: Hugh Dickins <hugh.dickins@...cali.co.uk>
> CC: Chris Wright <chrisw@...hat.com>
> CC: Izik Eidus <ieidus@...hat.com>
> Signed-off-by: Wu Fengguang <fengguang.wu@...el.com>

Acked-by: Chris Wright <chrisw@...hat.com>

> --- linux-mm.orig/tools/vm/page-types.c	2009-08-31 15:00:24.000000000 +0800
> +++ linux-mm/tools/vm/page-types.c	2009-08-31 15:02:10.000000000 +0800
> @@ -49,6 +49,7 @@
>  #define KPF_UNEVICTABLE		18
>  #define KPF_HWPOISON		19
>  #define KPF_NOPAGE		20
> +#define KPF_KSM			21

Doesn't this highlight the trouble w/ maintaining two copies of same info?

thanks,
-chris
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