lkml.org 
[lkml]   [2011]   [Dec]   [21]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 3/4] pagemap: export KPF_THP
Date
This flag shows that a given pages is a subpage of transparent hugepage.
It helps us debug and test kernel by showing physical address of thp.

Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Nacked-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Reviewed-by: Wu Fengguang <fengguang.wu@intel.com>

Changes since v1:
- remove unnecessary ifdefs
- fix confusing patch description
---
fs/proc/page.c | 2 ++
include/linux/kernel-page-flags.h | 1 +
2 files changed, 3 insertions(+), 0 deletions(-)

diff --git 3.2-rc5.orig/fs/proc/page.c 3.2-rc5/fs/proc/page.c
index 6d8e6a9..cb2dcea 100644
--- 3.2-rc5.orig/fs/proc/page.c
+++ 3.2-rc5/fs/proc/page.c
@@ -115,6 +115,8 @@ u64 stable_page_flags(struct page *page)
u |= 1 << KPF_COMPOUND_TAIL;
if (PageHuge(page))
u |= 1 << KPF_HUGE;
+ if (PageTransCompound(page))
+ u |= 1 << KPF_THP;

/*
* Caveats on high order pages: page->_count will only be set
diff --git 3.2-rc5.orig/include/linux/kernel-page-flags.h 3.2-rc5/include/linux/kernel-page-flags.h
index bd92a89..26a6571 100644
--- 3.2-rc5.orig/include/linux/kernel-page-flags.h
+++ 3.2-rc5/include/linux/kernel-page-flags.h
@@ -30,6 +30,7 @@
#define KPF_NOPAGE 20

#define KPF_KSM 21
+#define KPF_THP 22

/* kernel hacking assistances
* WARNING: subject to change, never rely on them!
--
1.7.7.3


\
 
 \ /
  Last update: 2011-12-21 23:23    [W:0.094 / U:0.484 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site