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authorKAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>2010-03-06 00:41:42 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2010-03-06 22:26:24 +0300
commitb084d4353ff99d824d3bc5a5c2c22c70b1fba722 (patch)
tree8178db2b337fc8a36e6ca2e1fc2e7d7473957e27 /include
parent34e55232e59f7b19050267a05ff1226e5cd122a5 (diff)
downloadlinux-b084d4353ff99d824d3bc5a5c2c22c70b1fba722.tar.xz
mm: count swap usage
A frequent questions from users about memory management is what numbers of swap ents are user for processes. And this information will give some hints to oom-killer. Besides we can count the number of swapents per a process by scanning /proc/<pid>/smaps, this is very slow and not good for usual process information handler which works like 'ps' or 'top'. (ps or top is now enough slow..) This patch adds a counter of swapents to mm_counter and update is at each swap events. Information is exported via /proc/<pid>/status file as [kamezawa@bluextal memory]$ cat /proc/self/status Name: cat State: R (running) Tgid: 2910 Pid: 2910 PPid: 2823 TracerPid: 0 Uid: 500 500 500 500 Gid: 500 500 500 500 FDSize: 256 Groups: 500 VmPeak: 82696 kB VmSize: 82696 kB VmLck: 0 kB VmHWM: 432 kB VmRSS: 432 kB VmData: 172 kB VmStk: 84 kB VmExe: 48 kB VmLib: 1568 kB VmPTE: 40 kB VmSwap: 0 kB <=============== this. [akpm@linux-foundation.org: coding-style fixes] Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Reviewed-by: Minchan Kim <minchan.kim@gmail.com> Reviewed-by: Christoph Lameter <cl@linux-foundation.org> Cc: Lee Schermerhorn <lee.schermerhorn@hp.com> Cc: David Rientjes <rientjes@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include')
-rw-r--r--include/linux/mm_types.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h
index 21861239ab0c..19549d7275ab 100644
--- a/include/linux/mm_types.h
+++ b/include/linux/mm_types.h
@@ -198,6 +198,7 @@ struct core_state {
enum {
MM_FILEPAGES,
MM_ANONPAGES,
+ MM_SWAPENTS,
NR_MM_COUNTERS
};