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

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Date:	Fri, 27 Feb 2015 11:37:35 +0100
From:	Michael Kerrisk <mtk.manpages@...il.com>
To:	Vlastimil Babka <vbabka@...e.cz>
Cc:	linux-mm <linux-mm@...ck.org>,
	Jerome Marchand <jmarchan@...hat.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-doc <linux-doc@...r.kernel.org>,
	Hugh Dickins <hughd@...gle.com>, Michal Hocko <mhocko@...e.cz>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Cyrill Gorcunov <gorcunov@...nvz.org>,
	Randy Dunlap <rdunlap@...radead.org>,
	linux-s390 <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>
Subject: Re: [PATCH 1/4] mm, documentation: clarify /proc/pid/status VmSwap limitations

[CC += linux-api@]

On Thu, Feb 26, 2015 at 2:51 PM, Vlastimil Babka <vbabka@...e.cz> 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.
>
> Signed-off-by: Vlastimil Babka <vbabka@...e.cz>
> ---
> I've noticed that proc(5) manpage is currently missing the VmSwap field
> altogether.
>
>  Documentation/filesystems/proc.txt | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/Documentation/filesystems/proc.txt b/Documentation/filesystems/proc.txt
> index a07ba61..d4f56ec 100644
> --- a/Documentation/filesystems/proc.txt
> +++ b/Documentation/filesystems/proc.txt
> @@ -231,6 +231,8 @@ Table 1-2: Contents of the status files (as of 2.6.30-rc7)
>   VmLib                       size of shared library code
>   VmPTE                       size of page table entries
>   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
> --
> 2.1.4
>
> --
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-- 
Michael Kerrisk Linux man-pages maintainer;
http://www.kernel.org/doc/man-pages/
Author of "The Linux Programming Interface", http://blog.man7.org/
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