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pagemap: document KPF_KSM and show it in page-types

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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>
This commit is contained in:
Wu Fengguang 2009-10-07 16:32:28 -07:00 committed by Linus Torvalds
parent 253fb02d62
commit a1bbb5ec39
2 changed files with 6 additions and 0 deletions
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2
Documentation/vm/page-types.c
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@ -71,6 +71,7 @@
#define KPF_UNEVICTABLE 18 #define KPF_UNEVICTABLE 18
#define KPF_HWPOISON 19 #define KPF_HWPOISON 19
#define KPF_NOPAGE 20 #define KPF_NOPAGE 20
#define KPF_KSM 21
/* [32-] kernel hacking assistances */ /* [32-] kernel hacking assistances */
#define KPF_RESERVED 32 #define KPF_RESERVED 32
@ -119,6 +120,7 @@ static char *page_flag_names[] = {
[KPF_UNEVICTABLE] = "u:unevictable", [KPF_UNEVICTABLE] = "u:unevictable",
[KPF_HWPOISON] = "X:hwpoison", [KPF_HWPOISON] = "X:hwpoison",
[KPF_NOPAGE] = "n:nopage", [KPF_NOPAGE] = "n:nopage",
[KPF_KSM] = "x:ksm",
[KPF_RESERVED] = "r:reserved", [KPF_RESERVED] = "r:reserved",
[KPF_MLOCKED] = "m:mlocked", [KPF_MLOCKED] = "m:mlocked",

4
Documentation/vm/pagemap.txt
View file

@ -59,6 +59,7 @@ There are three components to pagemap:
18. UNEVICTABLE 18. UNEVICTABLE
19. HWPOISON 19. HWPOISON
20. NOPAGE 20. NOPAGE
21. KSM
Short descriptions to the page flags: Short descriptions to the page flags:
@ -93,6 +94,9 @@ Short descriptions to the page flags:
20. NOPAGE 20. NOPAGE
no page frame exists at the requested address no page frame exists at the requested address
21. KSM
identical memory pages dynamically shared between one or more processes
[IO related page flags] [IO related page flags]
1. ERROR IO error occurred 1. ERROR IO error occurred
3. UPTODATE page has up-to-date data 3. UPTODATE page has up-to-date data