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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@ah.jp.nec.com>
Acked-by: Wu Fengguang <fengguang.wu@intel.com>
Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Acked-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Andrea Arcangeli <aarcange@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:
Naoya Horiguchi 2012-03-21 16:33:58 -07:00 committed by Linus Torvalds
parent e873c49fbf
commit 807f0ccfe1
2 changed files with 6 additions and 0 deletions
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2
Documentation/vm/page-types.c
View File

@ -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",

4
Documentation/vm/pagemap.txt
View File

@ -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