On Tue, 17 Jan 2012 16:16:20 +0100
Michal Hocko [off-list ref] wrote:

On Fri 13-01-12 17:32:27, KAMEZAWA Hiroyuki wrote:

quoted

From 788aebf15f3fa37940e0745cab72547e20683bf2 Mon Sep 17 00:00:00 2001
From: KAMEZAWA Hiroyuki <redacted>
Date: Thu, 12 Jan 2012 16:08:33 +0900
Subject: [PATCH 1/7] memcg: remove unnecessary check in mem_cgroup_update_page_stat()

commit 10ea69f1182b removes move_lock_page_cgroup() in thp-split path.
So, this PageTransHuge() check is unnecessary, too.

I do not see commit like that in the tree. I guess you meant
memcg: make mem_cgroup_split_huge_fixup() more efficient which is not
merged yet, right?

This commit in the linux-next.

commit e94c8a9cbce1aee4af9e1285802785481b7f93c5
Author: KAMEZAWA Hiroyuki [off-list ref]
Date:   Thu Jan 12 17:18:20 2012 -0800

    memcg: make mem_cgroup_split_huge_fixup() more efficient

quoted

Note:
 - considering when mem_cgroup_update_page_stat() is called,
   there will be no race between split_huge_page() and update_page_stat().
   All required locks are held in higher level.

We should never have THP page in this path in the first place. So why
not changing this to VM_BUG_ON(PageTransHuge).

Ying Han considers to support mlock stat.

Thanks,
-Kame