linux-kernel - Re: [PATCH v5 1/2] mm: hugetlb: proc: add HugetlbPages field to /proc/PID/smaps

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Message-ID: <20150821063301.GC23723@dhcp22.suse.cz>
Date:	Fri, 21 Aug 2015 08:33:01 +0200
From:	Michal Hocko <mhocko@...nel.org>
To:	Naoya Horiguchi <n-horiguchi@...jp.nec.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	David Rientjes <rientjes@...gle.com>,
	Jörn Engel <joern@...estorage.com>,
	Mike Kravetz <mike.kravetz@...cle.com>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Naoya Horiguchi <nao.horiguchi@...il.com>
Subject: Re: [PATCH v5 1/2] mm: hugetlb: proc: add HugetlbPages field to
 /proc/PID/smaps

On Thu 20-08-15 23:20:12, Naoya Horiguchi wrote:
[...]
> From: Naoya Horiguchi <n-horiguchi@...jp.nec.com>
> Date: Fri, 21 Aug 2015 08:13:31 +0900
> Subject: [PATCH] Documentation/filesystems/proc.txt: give additional comment
>  about hugetlb usage
> 
> ---
>  Documentation/filesystems/proc.txt | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/filesystems/proc.txt b/Documentation/filesystems/proc.txt
> index f561fc46e41b..b775b6faaeda 100644
> --- a/Documentation/filesystems/proc.txt
> +++ b/Documentation/filesystems/proc.txt
> @@ -446,7 +446,8 @@ indicates the amount of memory currently marked as referenced or accessed.
>  a mapping associated with a file may contain anonymous pages: when MAP_PRIVATE
>  and a page is modified, the file page is replaced by a private anonymous copy.
>  "AnonHugePages" shows the ammount of memory backed by transparent hugepage.
> -"HugetlbPages" shows the ammount of memory backed by hugetlbfs page.
> +"HugetlbPages" shows the ammount of memory backed by hugetlbfs page (which is
> +not counted in "Rss" or "Pss" field for historical reasons.)
>  "Swap" shows how much would-be-anonymous memory is also used, but out on swap.
>  
>  "VmFlags" field deserves a separate description. This member represents the kernel

Thank you!
-- 
Michal Hocko
SUSE Labs
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