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[RFC][PATCH 4/4] pagemap: document KPF_KSM and show it in page-types

Posted by Wu Fengguang 
It indicates to the system admin that processes mapping such pages may be
eating less physical memory than the reported numbers by legacy tools.

CC: Hugh Dickins <[email protected]>
CC: Izik Eidus <[email protected]>
Acked-by: Chris Wright <[email protected]>
Signed-off-by: Wu Fengguang <[email protected]>
---
Documentation/vm/pagemap.txt | 4 ++++
tools/vm/page-types.c | 2 ++
2 files changed, 6 insertions(+)

--- linux-mm.orig/Documentation/vm/pagemap.txt 2009-08-31 15:02:55.000000000 +0800
+++ linux-mm/Documentation/vm/pagemap.txt 2009-09-01 15:54:36.000000000 +0800
@@ -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
--- linux-mm.orig/tools/vm/page-types.c 2009-08-31 15:00:24.000000000 +0800
+++ linux-mm/tools/vm/page-types.c 2009-09-01 15:54:16.000000000 +0800
@@ -49,6 +49,7 @@
#define KPF_UNEVICTABLE 18
#define KPF_HWPOISON 19
#define KPF_NOPAGE 20
+#define KPF_KSM 21

/* [32-] kernel hacking assistances */
#define KPF_RESERVED 32
@@ -97,6 +98,7 @@ 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",

--

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