[RFC][PATCH 5/6] memcg: remove unnecessary memory barrier.
From: KAMEZAWA Hiroyuki <hidden>
Date: 2012-03-28 11:02:28
Also in:
lkml
Subsystem:
control group - memory resource controller (memcg), memory management, the rest · Maintainers:
Johannes Weiner, Michal Hocko, Roman Gushchin, Shakeel Butt, Andrew Morton, Linus Torvalds
Now, Used bit and a pointer to memory cgroup are set at once. memory barrier for Used bit -> pc->mem_cgroup is not necessary. Signed-off-by: KAMEZAWA Hiroyuki <redacted> --- mm/memcontrol.c | 2 -- 1 files changed, 0 insertions(+), 2 deletions(-)
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 622fd2e..767bef3 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c@@ -1258,8 +1258,6 @@ mem_cgroup_get_reclaim_stat_from_page(struct page *page) pc = lookup_page_cgroup(page); if (!PageCgroupUsed(pc)) return NULL; - /* Ensure pc's mem_cgroup is visible after reading PCG_USED. */ - smp_rmb(); mz = page_cgroup_zoneinfo(pc_to_mem_cgroup(pc), page); return &mz->reclaim_stat; }
--
1.7.4.1
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