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@xxxxxxxxxxxxxx> --- 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, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>