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authorWu Fengguang <fengguang.wu@intel.com>2009-10-07 16:32:28 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2009-10-08 07:36:39 -0700
commita1bbb5ec39042fb762e7f4bcc634da0d87834193 (patch)
tree20bb538ee4b3a9fbf5e8e9d1988fed2011deffce /Documentation
parent253fb02d62571e5455eedc9e39b9d660e86a40f0 (diff)
downloadlinux-a1bbb5ec39042fb762e7f4bcc634da0d87834193.tar.gz
pagemap: document KPF_KSM and show it in page-types
It indicates to the system admin that processes mapping such pages may be eating less physical memory than the reported numbers by legacy tools. Signed-off-by: Wu Fengguang <fengguang.wu@intel.com> Cc: Hugh Dickins <hugh.dickins@tiscali.co.uk> Cc: Izik Eidus <ieidus@redhat.com> Acked-by: Chris Wright <chrisw@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/vm/page-types.c2
-rw-r--r--Documentation/vm/pagemap.txt4
2 files changed, 6 insertions, 0 deletions
diff --git a/Documentation/vm/page-types.c b/Documentation/vm/page-types.c
index 87f57228f56..9899fa239ee 100644
--- a/Documentation/vm/page-types.c
+++ b/Documentation/vm/page-types.c
@@ -71,6 +71,7 @@
#define KPF_UNEVICTABLE 18
#define KPF_HWPOISON 19
#define KPF_NOPAGE 20
+#define KPF_KSM 21
/* [32-] kernel hacking assistances */
#define KPF_RESERVED 32
@@ -119,6 +120,7 @@ static char *page_flag_names[] = {
[KPF_UNEVICTABLE] = "u:unevictable",
[KPF_HWPOISON] = "X:hwpoison",
[KPF_NOPAGE] = "n:nopage",
+ [KPF_KSM] = "x:ksm",
[KPF_RESERVED] = "r:reserved",
[KPF_MLOCKED] = "m:mlocked",
diff --git a/Documentation/vm/pagemap.txt b/Documentation/vm/pagemap.txt
index 2fdd84a1910..df09b9650a8 100644
--- a/Documentation/vm/pagemap.txt
+++ b/Documentation/vm/pagemap.txt
@@ -59,6 +59,7 @@ There are three components to pagemap:
18. UNEVICTABLE
19. HWPOISON
20. NOPAGE
+ 21. KSM
Short descriptions to the page flags:
@@ -93,6 +94,9 @@ Short descriptions to the page flags:
20. NOPAGE
no page frame exists at the requested address
+21. KSM
+ identical memory pages dynamically shared between one or more processes
+
[IO related page flags]
1. ERROR IO error occurred
3. UPTODATE page has up-to-date data