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 CC: Izik Eidus Acked-by: Chris Wright Signed-off-by: Wu Fengguang --- 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", -- -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/