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

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Message-Id: <1424958666-18241-2-git-send-email-vbabka@suse.cz>
Date:	Thu, 26 Feb 2015 14:51:03 +0100
From:	Vlastimil Babka <vbabka@...e.cz>
To:	linux-mm@...ck.org, Jerome Marchand <jmarchan@...hat.com>
Cc:	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	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@...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>,
	Vlastimil Babka <vbabka@...e.cz>
Subject: [PATCH 1/4] mm, documentation: clarify /proc/pid/status VmSwap limitations

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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