linux-kernel - Re: [PATCH 4/4] pagemap: document KPF_THP and make page-types aware of it

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Date:	Mon, 26 Dec 2011 17:42:17 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Naoya Horiguchi <n-horiguchi@...jp.nec.com>
Cc:	linux-mm@...ck.org, Andrew Morton <akpm@...ux-foundation.org>,
	David Rientjes <rientjes@...gle.com>,
	Andi Kleen <andi@...stfloor.org>,
	Wu Fengguang <fengguang.wu@...el.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/4] pagemap: document KPF_THP and make page-types aware
 of it

On Wed, 21 Dec 2011 17:23:48 -0500
Naoya Horiguchi <n-horiguchi@...jp.nec.com> wrote:

> page-types, which is a common user of pagemap, gets aware of thp
> with this patch. This helps system admins and kernel hackers know
> about how thp works.
> Here is a sample output of page-types over a thp:
> 
>   $ page-types -p <pid> --raw --list
> 
>   voffset offset  len     flags
>   ...
>   7f9d40200       3f8400  1       ___U_lA____Ma_bH______t____________
>   7f9d40201       3f8401  1ff     ________________T_____t____________
> 
>                flags      page-count       MB  symbolic-flags                     long-symbolic-flags
>   0x0000000000410000             511        1  ________________T_____t____________        compound_tail,thp
>   0x000000000040d868               1        0  ___U_lA____Ma_bH______t____________        uptodate,lru,active,mmap,anonymous,swapbacked,compound_head,thp
> 
> Signed-off-by: Naoya Horiguchi <n-horiguchi@...jp.nec.com>
> Acked-by: Wu Fengguang <fengguang.wu@...el.com>
> 
Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>

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