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Subject[PATCH 4/4] pagemap: document KPF_THP and make page-types aware of it
Date
page-types, which is a common user of pagemap, gets aware of thp
with this patch. This helps system admins and kernel hackers know
about how thp works.
Here is a sample output of page-types over a thp:

$ page-types -p <pid> --raw --list

voffset offset len flags
...
7f9d40200 3f8400 1 ___U_lA____Ma_bH______t____________
7f9d40201 3f8401 1ff ________________T_____t____________
flags page-count MB symbolic-flags long-symbolic-flags
0x0000000000410000 511 1 ________________T_____t____________ compound_tail,thp
0x000000000040d868 1 0 ___U_lA____Ma_bH______t____________ uptodate,lru,active,mmap,anonymous,swapbacked,compound_head,thp
Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Acked-by: Wu Fengguang <fengguang.wu@intel.com>

Changes since v1:
- fix misused word
---
Documentation/vm/page-types.c | 2 ++
Documentation/vm/pagemap.txt | 4 ++++
2 files changed, 6 insertions(+), 0 deletions(-)
diff --git 3.2-rc5.orig/Documentation/vm/page-types.c 3.2-rc5/Documentation/vm/page-types.c
index 7445caa..0b13f02 100644
--- 3.2-rc5.orig/Documentation/vm/page-types.c
+++ 3.2-rc5/Documentation/vm/page-types.c
@@ -98,6 +98,7 @@
#define KPF_HWPOISON 19
#define KPF_NOPAGE 20
#define KPF_KSM 21
+#define KPF_THP 22

/* [32-] kernel hacking assistances */
#define KPF_RESERVED 32
@@ -147,6 +148,7 @@ static const char *page_flag_names[] = {
[KPF_HWPOISON] = "X:hwpoison",
[KPF_NOPAGE] = "n:nopage",
[KPF_KSM] = "x:ksm",
+ [KPF_THP] = "t:thp",

[KPF_RESERVED] = "r:reserved",
[KPF_MLOCKED] = "m:mlocked",
diff --git 3.2-rc5.orig/Documentation/vm/pagemap.txt 3.2-rc5/Documentation/vm/pagemap.txt
index df09b96..4600cbe 100644
--- 3.2-rc5.orig/Documentation/vm/pagemap.txt
+++ 3.2-rc5/Documentation/vm/pagemap.txt
@@ -60,6 +60,7 @@ There are three components to pagemap:
19. HWPOISON
20. NOPAGE
21. KSM
+ 22. THP

Short descriptions to the page flags:

@@ -97,6 +98,9 @@ Short descriptions to the page flags:
21. KSM
identical memory pages dynamically shared between one or more processes

+22. THP
+ contiguous pages which construct transparent hugepages
+
[IO related page flags]
1. ERROR IO error occurred
3. UPTODATE page has up-to-date data
--
1.7.7.3


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