summaryrefslogtreecommitdiffstats
path: root/fs
diff options
context:
space:
mode:
authorNaoya Horiguchi <n-horiguchi@ah.jp.nec.com>2012-03-22 00:33:58 +0100
committerLinus Torvalds <torvalds@linux-foundation.org>2012-03-22 01:54:57 +0100
commite873c49fbfdd595481976b915850e682441bcbec (patch)
tree87ad5d125563d1eb6418e1f7b5a094fab6098108 /fs
parentthp: optimize away unnecessary page table locking (diff)
downloadlinux-e873c49fbfdd595481976b915850e682441bcbec.tar.xz
linux-e873c49fbfdd595481976b915850e682441bcbec.zip
pagemap: export KPF_THP
This flag shows that a given page is a subpage of a transparent hugepage. It helps us debug and test the kernel by showing physical address of thp. Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> Reviewed-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>
Diffstat (limited to 'fs')
-rw-r--r--fs/proc/page.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/proc/page.c b/fs/proc/page.c
index 6d8e6a9e93ab..7fcd0d60a968 100644
--- a/fs/proc/page.c
+++ b/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;
+ else if (PageTransCompound(page))
+ u |= 1 << KPF_THP;
/*
* Caveats on high order pages: page->_count will only be set