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Date: Fri, 11 May 2012 14:44:08 -0300 From: Glauber Costa <glommer@...allels.com> To: <linux-kernel@...r.kernel.org> Cc: <cgroups@...r.kernel.org>, <linux-mm@...ck.org>, <kamezawa.hiroyu@...fujitsu.com>, Tejun Heo <tj@...nel.org>, Li Zefan <lizefan@...wei.com>, Greg Thelen <gthelen@...gle.com>, Suleiman Souhlal <suleiman@...gle.com>, Michal Hocko <mhocko@...e.cz>, Johannes Weiner <hannes@...xchg.org>, <devel@...nvz.org>, Glauber Costa <glommer@...allels.com> Subject: [PATCH v2 06/29] memcg: Make it possible to use the stock for more than one page. From: Suleiman Souhlal <ssouhlal@...eBSD.org> Signed-off-by: Suleiman Souhlal <suleiman@...gle.com> Signed-off-by: Glauber Costa <glommer@...allels.com> Acked-by: Kamezawa Hiroyuki <kamezawa.hiroyu@...fujitsu.com> --- mm/memcontrol.c | 18 +++++++++--------- 1 files changed, 9 insertions(+), 9 deletions(-) diff --git a/mm/memcontrol.c b/mm/memcontrol.c index 0b4b4c8..248d80b 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -1998,19 +1998,19 @@ static DEFINE_PER_CPU(struct memcg_stock_pcp, memcg_stock); static DEFINE_MUTEX(percpu_charge_mutex); /* - * Try to consume stocked charge on this cpu. If success, one page is consumed - * from local stock and true is returned. If the stock is 0 or charges from a - * cgroup which is not current target, returns false. This stock will be - * refilled. + * Try to consume stocked charge on this cpu. If success, nr_pages pages are + * consumed from local stock and true is returned. If the stock is 0 or + * charges from a cgroup which is not current target, returns false. + * This stock will be refilled. */ -static bool consume_stock(struct mem_cgroup *memcg) +static bool consume_stock(struct mem_cgroup *memcg, int nr_pages) { struct memcg_stock_pcp *stock; bool ret = true; stock = &get_cpu_var(memcg_stock); - if (memcg == stock->cached && stock->nr_pages) - stock->nr_pages--; + if (memcg == stock->cached && stock->nr_pages >= nr_pages) + stock->nr_pages -= nr_pages; else /* need to call res_counter_charge */ ret = false; put_cpu_var(memcg_stock); @@ -2309,7 +2309,7 @@ again: VM_BUG_ON(css_is_removed(&memcg->css)); if (mem_cgroup_is_root(memcg)) goto done; - if (nr_pages == 1 && consume_stock(memcg)) + if (consume_stock(memcg, nr_pages)) goto done; css_get(&memcg->css); } else { @@ -2334,7 +2334,7 @@ again: rcu_read_unlock(); goto done; } - if (nr_pages == 1 && consume_stock(memcg)) { + if (consume_stock(memcg, nr_pages)) { /* * It seems dagerous to access memcg without css_get(). * But considering how consume_stok works, it's not -- 1.7.7.6 -- 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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