From: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
To: linux-mm@kvack.org
Cc: Andrew Morton <akpm@linux-foundation.org>,
David Rientjes <rientjes@google.com>,
Andi Kleen <andi@firstfloor.org>,
Wu Fengguang <fengguang.wu@intel.com>,
Andrea Arcangeli <aarcange@redhat.com>,
KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
linux-kernel@vger.kernel.org,
Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Subject: [PATCH 3/6] pagemap: export KPF_THP
Date: Fri, 27 Jan 2012 18:02:50 -0500 [thread overview]
Message-ID: <1327705373-29395-4-git-send-email-n-horiguchi@ah.jp.nec.com> (raw)
In-Reply-To: <1327705373-29395-1-git-send-email-n-horiguchi@ah.jp.nec.com>
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>
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>
Changes since v2:
- replace if with else-if not to set KPF_THP for hugetlbfs page
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 3.3-rc1.orig/fs/proc/page.c 3.3-rc1/fs/proc/page.c
index 6d8e6a9..7fcd0d6 100644
--- 3.3-rc1.orig/fs/proc/page.c
+++ 3.3-rc1/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
diff --git 3.3-rc1.orig/include/linux/kernel-page-flags.h 3.3-rc1/include/linux/kernel-page-flags.h
index bd92a89..26a6571 100644
--- 3.3-rc1.orig/include/linux/kernel-page-flags.h
+++ 3.3-rc1/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!
--
1.7.7.6
next prev parent reply other threads:[~2012-01-27 23:01 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-01-27 23:02 [PATCH 0/6 v4] pagemap handles transparent hugepage Naoya Horiguchi
2012-01-27 23:02 ` [PATCH 1/6] pagemap: avoid splitting thp when reading /proc/pid/pagemap Naoya Horiguchi
2012-01-29 13:17 ` Hillf Danton
2012-01-30 19:23 ` Naoya Horiguchi
2012-01-27 23:02 ` [PATCH 2/6] thp: optimize away unnecessary page table locking Naoya Horiguchi
2012-01-28 11:23 ` Hillf Danton
2012-01-28 22:33 ` Naoya Horiguchi
2012-01-30 6:22 ` KAMEZAWA Hiroyuki
2012-02-02 5:27 ` Naoya Horiguchi
2012-02-02 8:32 ` KAMEZAWA Hiroyuki
2012-01-27 23:02 ` Naoya Horiguchi [this message]
2012-01-27 23:02 ` [PATCH 4/6] pagemap: document KPF_THP and make page-types aware of it Naoya Horiguchi
2012-01-27 23:02 ` [PATCH 5/6] introduce thp_ptep_get() Naoya Horiguchi
2012-01-30 6:26 ` KAMEZAWA Hiroyuki
2012-01-30 19:24 ` Naoya Horiguchi
2012-01-27 23:02 ` [PATCH 6/6] pagemap: introduce data structure for pagemap entry Naoya Horiguchi
2012-01-30 6:31 ` KAMEZAWA Hiroyuki
2012-01-30 19:27 ` Naoya Horiguchi
-- strict thread matches above, loose matches on Subject: below --
2012-02-08 15:51 [PATCH 0/6 v5] pagemap handles transparent hugepage Naoya Horiguchi
2012-02-08 15:51 ` [PATCH 3/6] pagemap: export KPF_THP Naoya Horiguchi
2012-01-12 19:34 [PATCH 0/6 v3] pagemap handles transparent hugepage Naoya Horiguchi
2012-01-12 19:34 ` [PATCH 3/6] pagemap: export KPF_THP Naoya Horiguchi
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