fs/proc/page.c: add PageAnon check to surely detect thp
authorNaoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Thu, 23 Jan 2014 23:52:53 +0000 (15:52 -0800)
committerLinus Torvalds <torvalds@linux-foundation.org>
Fri, 24 Jan 2014 00:36:50 +0000 (16:36 -0800)
commite3bba3c3c90cd434c1ccb9e5dc704a96baf9541c
tree86897834d0ccbe93f8b44249569a2be70486b573
parent8ff69e2c85f84b6b371e3c1d01207e73c0500125
fs/proc/page.c: add PageAnon check to surely detect thp

stable_page_flags() checks !PageHuge && PageTransCompound && PageLRU to
know that a specified page is thp or not.  But sometimes it's not enough
and we fail to detect thp when the thp is on pagevec.  This happens only
for a few seconds after LRU list operations, but it makes it difficult
to control our applications depending on this flag.

So this patch adds another check PageAnon to detect thps on pagevec.  It
might not give the future extensibility for thp pagecache, but it's OK
at least for now.

Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: David Rientjes <rientjes@google.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Wu Fengguang <fengguang.wu@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
fs/proc/page.c