linux-kernel - Re: [PATCH v1 2/3] /proc/kpageflags: return KPF

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Message-ID: <20160204164337.GB16895@esperanza>
Date:	Thu, 4 Feb 2016 19:43:37 +0300
From:	Vladimir Davydov <vdavydov@...tuozzo.com>
To:	Naoya Horiguchi <n-horiguchi@...jp.nec.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Konstantin Khlebnikov <koct9i@...il.com>, <linux-mm@...ck.org>,
	<linux-kernel@...r.kernel.org>,
	Naoya Horiguchi <nao.horiguchi@...il.com>
Subject: Re: [PATCH v1 2/3] /proc/kpageflags: return KPF_SLAB for slab tail
 pages

On Thu, Feb 04, 2016 at 04:08:02PM +0900, Naoya Horiguchi wrote:
> Currently /proc/kpageflags returns just KPF_COMPOUND_TAIL for slab tail pages,
> which is inconvenient when grasping how slab pages are distributed (userspace
> always needs to check which kind of tail pages by itself). This patch sets
> KPF_SLAB for such pages.
> 
> With this patch:
> 
>   $ grep Slab /proc/meminfo ; tools/vm/page-types -b slab
>   Slab:              64880 kB
>                flags      page-count       MB  symbolic-flags                     long-symbolic-flags
>   0x0000000000000080           16220       63  _______S__________________________________ slab
>                total           16220       63
> 
> 16220 pages equals to 64880 kB, so returned result is consistent with the
> global counter.
> 
> Signed-off-by: Naoya Horiguchi <n-horiguchi@...jp.nec.com>

Reviewed-by: Vladimir Davydov <vdavydov@...tuozzo.com>