linux-kernel - Re: [PATCH v3 1/4] mm, documentation: clarify /proc/pid/status VmSwap limitations

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Message-ID: <20150925113637.GH16497@dhcp22.suse.cz>
Date:	Fri, 25 Sep 2015 13:36:37 +0200
From:	Michal Hocko <mhocko@...nel.org>
To:	Vlastimil Babka <vbabka@...e.cz>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Jerome Marchand <jmarchan@...hat.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, Hugh Dickins <hughd@...gle.com>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Cyrill Gorcunov <gorcunov@...nvz.org>,
	Randy Dunlap <rdunlap@...radead.org>,
	linux-s390@...r.kernel.org,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Paul Mackerras <paulus@...ba.org>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Linux API <linux-api@...r.kernel.org>,
	Konstantin Khlebnikov <khlebnikov@...dex-team.ru>,
	Minchan Kim <minchan@...nel.org>
Subject: Re: [PATCH v3 1/4] mm, documentation: clarify /proc/pid/status
 VmSwap limitations

[Sorry for a really long delay]

On Wed 05-08-15 15:01:22, Vlastimil Babka wrote:
> The documentation for /proc/pid/status does not mention that the value of
> VmSwap counts only swapped out anonymous private pages and not shmem. This is
> not obvious, so document this limitation.

This is definitely an improvement
> 
> Signed-off-by: Vlastimil Babka <vbabka@...e.cz>

Acked-by: Michal Hocko <mhocko@...e.com>

> ---
>  Documentation/filesystems/proc.txt | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/Documentation/filesystems/proc.txt b/Documentation/filesystems/proc.txt
> index d411ca6..29f4011 100644
> --- a/Documentation/filesystems/proc.txt
> +++ b/Documentation/filesystems/proc.txt
> @@ -237,6 +237,8 @@ Table 1-2: Contents of the status files (as of 4.1)
>   VmPTE                       size of page table entries
>   VmPMD                       size of second level page tables
>   VmSwap                      size of swap usage (the number of referred swapents)
> +                             by anonymous private data (shmem swap usage is not
> +                             included)
>   Threads                     number of threads
>   SigQ                        number of signals queued/max. number for queue
>   SigPnd                      bitmap of pending signals for the thread
> -- 
> 2.4.6
> 
> --
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-- 
Michal Hocko
SUSE Labs
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