The patch titled
Document the new Anonymous field in smaps
has been added to the -mm tree. Its filename is
proc-pid-smaps-export-amount-of-anonymous-memory-in-a-mapping-doc.patch
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------------------------------------------------------
Subject: Document the new Anonymous field in smaps
From: Nikanth Karthikesan <knikanth@xxxxxxx>
Document the new Anonymous field in smaps, and also the Swap field.
Explain what smaps means by shared and private, which differs from
MAP_SHARED and MAP_PRIVATE.
Signed-off-by: Nikanth Karthikesan <knikanth@xxxxxxx>
Signed-off-by: Hugh Dickins <hughd@xxxxxxxxxx>
Cc: KOSAKI Motohiro <kosaki.motohiro@xxxxxxxxxxxxxx>
Cc: Matt Mackall <mpm@xxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
Documentation/filesystems/proc.txt | 15 +++++++++++----
1 file changed, 11 insertions(+), 4 deletions(-)
diff -puN Documentation/filesystems/proc.txt~proc-pid-smaps-export-amount-of-anonymous-memory-in-a-mapping-doc Documentation/filesystems/proc.txt
--- a/Documentation/filesystems/proc.txt~proc-pid-smaps-export-amount-of-anonymous-memory-in-a-mapping-doc
+++ a/Documentation/filesystems/proc.txt
@@ -370,17 +370,24 @@ Shared_Dirty: 0 kB
Private_Clean: 0 kB
Private_Dirty: 0 kB
Referenced: 892 kB
+Anonymous: 0 kB
Swap: 0 kB
KernelPageSize: 4 kB
MMUPageSize: 4 kB
-The first of these lines shows the same information as is displayed for the
-mapping in /proc/PID/maps. The remaining lines show the size of the mapping,
+The first of these lines shows the same information as is displayed for the
+mapping in /proc/PID/maps. The remaining lines show the size of the mapping,
the amount of the mapping that is currently resident in RAM, the "proportional
set sizeâ?? (divide each shared page by the number of processes sharing it), the
number of clean and dirty shared pages in the mapping, and the number of clean
-and dirty private pages in the mapping. The "Referenced" indicates the amount
-of memory currently marked as referenced or accessed.
+and dirty private pages in the mapping. Note that even a page which is part of
+a MAP_SHARED mapping, but has only a single pte mapped, i.e. is currently used
+by only one process, is accounted as private and not as shared. "Referenced"
+indicates the amount of memory currently marked as referenced or accessed.
+"Anonymous" shows the amount of memory that does not belong to any file. Even
+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.
+"Swap" shows how much would-be-anonymous memory is also used, but out on swap.
This file is only present if the CONFIG_MMU kernel configuration option is
enabled.
_
Patches currently in -mm which might be from knikanth@xxxxxxx are
linux-next.patch
proc-pid-smaps-export-amount-of-anonymous-memory-in-a-mapping.patch
proc-pid-smaps-export-amount-of-anonymous-memory-in-a-mapping-doc.patch
documentation-filesystems-proctxt-improve-smaps-field-documentation.patch
mm-smaps-export-mlock-information.patch
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