[RFC][PATCH -mm 5/7] memcg: prefetch mem cgroup per zone

Address of "mz" can be calculated in early stage.
prefetch it (we always do spin_lock later.)


Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
---
mm/memcontrol.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

Index: mmtom-2.6.27-rc3+/mm/memcontrol.c
===================================================================
--- mmtom-2.6.27-rc3+.orig/mm/memcontrol.c
+++ mmtom-2.6.27-rc3+/mm/memcontrol.c
@@ -694,6 +694,8 @@ static int mem_cgroup_charge_common(stru
}
}

+ mz = mem_cgroup_zoneinfo(mem, page_to_nid(page), page_zonenum(page));
+ prefetchw(mz);
pc->mem_cgroup = mem;
pc->page = page;
pc->flags = 0;
@@ -716,7 +718,6 @@ static int mem_cgroup_charge_common(stru

page_assign_page_cgroup(page, pc);

- mz = page_cgroup_zoneinfo(pc);
spin_lock_irqsave(&mz->lru_lock, flags);
__mem_cgroup_add_list(mz, pc);
spin_unlock_irqrestore(&mz->lru_lock, flags);

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