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Commit a1bbb5ec authored by Wu Fengguang's avatar Wu Fengguang Committed by Linus Torvalds
Browse files

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: default avatarWu Fengguang <fengguang.wu@intel.com>
Cc: Hugh Dickins <hugh.dickins@tiscali.co.uk>
Cc: Izik Eidus <ieidus@redhat.com>
Acked-by: default avatarChris Wright <chrisw@redhat.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 253fb02d

Documentation/vm/page-types.c

+2 −0
Original line number Diff line number Diff line
@@ -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",

Documentation/vm/pagemap.txt

+4 −0
Original line number Diff line number Diff line
@@ -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