Subject: [merged] memcg-check-for-proper-lock-held-in-mem_cgroup_update_page_stat.patch removed from -mm tree
To: handai.szj@xxxxxxxxxx,fengguang.wu@xxxxxxxxx,gthelen@xxxxxxxxxx,hannes@xxxxxxxxxxx,kamezawa.hiroyu@xxxxxxxxxxxxxx,mhocko@xxxxxxx,mm-commits@xxxxxxxxxxxxxxx
From: akpm@xxxxxxxxxxxxxxxxxxxx
Date: Fri, 13 Sep 2013 13:02:44 -0700
The patch titled
Subject: memcg: check for proper lock held in mem_cgroup_update_page_stat
has been removed from the -mm tree. Its filename was
memcg-check-for-proper-lock-held-in-mem_cgroup_update_page_stat.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
From: Sha Zhengju <handai.szj@xxxxxxxxxx>
Subject: memcg: check for proper lock held in mem_cgroup_update_page_stat
We should call mem_cgroup_begin_update_page_stat() before
mem_cgroup_update_page_stat() to get proper locks, however the latter
doesn't do any checking that we use proper locking, which would be hard.
Suggested by Michal Hock we could at least test for rcu_read_lock_held()
because RCU is held if !mem_cgroup_disabled().
Signed-off-by: Sha Zhengju <handai.szj@xxxxxxxxxx>
Acked-by: Michal Hocko <mhocko@xxxxxxx>
Reviewed-by: Greg Thelen <gthelen@xxxxxxxxxx>
Cc: Fengguang Wu <fengguang.wu@xxxxxxxxx>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/memcontrol.c | 1 +
1 file changed, 1 insertion(+)
diff -puN mm/memcontrol.c~memcg-check-for-proper-lock-held-in-mem_cgroup_update_page_stat mm/memcontrol.c
--- a/mm/memcontrol.c~memcg-check-for-proper-lock-held-in-mem_cgroup_update_page_stat
+++ a/mm/memcontrol.c
@@ -2225,6 +2225,7 @@ void mem_cgroup_update_page_stat(struct
if (mem_cgroup_disabled())
return;
+ VM_BUG_ON(!rcu_read_lock_held());
memcg = pc->mem_cgroup;
if (unlikely(!memcg || !PageCgroupUsed(pc)))
return;
_
Patches currently in -mm which might be from handai.szj@xxxxxxxxxx are
origin.patch
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