The patch titled
Subject: pagemap: document KPF_THP and make page-types aware of it
has been added to the -mm tree. Its filename is
pagemap-document-kpf_thp-and-make-page-types-aware-of-it.patch
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------------------------------------------------------
From: Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx>
Subject: pagemap: document KPF_THP and make page-types aware of it
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@xxxxxxxxxxxxx>
Acked-by: Wu Fengguang <fengguang.wu@xxxxxxxxx>
Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
Acked-by: KOSAKI Motohiro <kosaki.motohiro@xxxxxxxxxxxxxx>
Cc: David Rientjes <rientjes@xxxxxxxxxx>
Cc: Andi Kleen <andi@xxxxxxxxxxxxxx>
Cc: Andrea Arcangeli <aarcange@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
Documentation/vm/page-types.c | 2 ++
Documentation/vm/pagemap.txt | 4 ++++
2 files changed, 6 insertions(+)
diff -puN Documentation/vm/page-types.c~pagemap-document-kpf_thp-and-make-page-types-aware-of-it Documentation/vm/page-types.c
--- a/Documentation/vm/page-types.c~pagemap-document-kpf_thp-and-make-page-types-aware-of-it
+++ a/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 -puN Documentation/vm/pagemap.txt~pagemap-document-kpf_thp-and-make-page-types-aware-of-it Documentation/vm/pagemap.txt
--- a/Documentation/vm/pagemap.txt~pagemap-document-kpf_thp-and-make-page-types-aware-of-it
+++ a/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
_
Subject: Subject: pagemap: document KPF_THP and make page-types aware of it
Patches currently in -mm which might be from n-horiguchi@xxxxxxxxxxxxx are
pagemap-avoid-splitting-thp-when-reading-proc-pid-pagemap.patch
thp-optimize-away-unnecessary-page-table-locking.patch
pagemap-export-kpf_thp.patch
pagemap-document-kpf_thp-and-make-page-types-aware-of-it.patch
mm-introduce-pmd_to_pte_t.patch
pagemap-introduce-data-structure-for-pagemap-entry.patch
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