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Date: Wed, 28 Mar 2012 20:00:38 +0900 From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> To: "linux-mm@...ck.org" <linux-mm@...ck.org> CC: Linux Kernel <linux-kernel@...r.kernel.org>, Michal Hocko <mhocko@...e.cz>, Johannes Weiner <hannes@...xchg.org>, Andrew Morton <akpm@...ux-foundation.org>, Han Ying <yinghan@...gle.com>, Glauber Costa <glommer@...allels.com>, Konstantin Khlebnikov <khlebnikov@...nvz.org>, Suleiman Souhlal <suleiman@...gle.com> Subject: [RFC][PATCH 5/6] memcg: remove unnecessary memory barrier. 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 <kamezawa.hiroyu@...fujitsu.com> --- 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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