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Subject[patch 8/8] mm: memcg: modify PageCgroupCache non-atomically
Date
From: Johannes Weiner <jweiner@redhat.com>

This bit is protected by lock_page_cgroup(), there is no need for
locked operations when setting and clearing it.

Signed-off-by: Johannes Weiner <jweiner@redhat.com>
---
include/linux/page_cgroup.h | 4 ++--
mm/memcontrol.c | 4 ++--
2 files changed, 4 insertions(+), 4 deletions(-)
diff --git a/include/linux/page_cgroup.h b/include/linux/page_cgroup.h
index a0bc9d0..14ddcaf 100644
--- a/include/linux/page_cgroup.h
+++ b/include/linux/page_cgroup.h
@@ -77,8 +77,8 @@ static inline int __TestClearPageCgroup##uname(struct page_cgroup *pc) \

/* Cache flag is set only once (at allocation) */
TESTPCGFLAG(Cache, CACHE)
-CLEARPCGFLAG(Cache, CACHE)
-SETPCGFLAG(Cache, CACHE)
+__CLEARPCGFLAG(Cache, CACHE)
+__SETPCGFLAG(Cache, CACHE)

TESTPCGFLAG(Used, USED)
CLEARPCGFLAG(Used, USED)
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 51aba19..8cd1d1c 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -2444,11 +2444,11 @@ static void __mem_cgroup_commit_charge(struct mem_cgroup *memcg,
switch (ctype) {
case MEM_CGROUP_CHARGE_TYPE_CACHE:
case MEM_CGROUP_CHARGE_TYPE_SHMEM:
- SetPageCgroupCache(pc);
+ __SetPageCgroupCache(pc);
SetPageCgroupUsed(pc);
break;
case MEM_CGROUP_CHARGE_TYPE_MAPPED:
- ClearPageCgroupCache(pc);
+ __ClearPageCgroupCache(pc);
SetPageCgroupUsed(pc);
break;
default:
--
1.7.6.4


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