linux-kernel - Re: [PATCH 1/4] memcg: do not try to drain per-cpu caches without pages

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Date:	Mon, 25 Jul 2011 10:16:57 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Michal Hocko <mhocko@...e.cz>
Cc:	linux-mm@...ck.org, Balbir Singh <bsingharora@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/4] memcg: do not try to drain per-cpu caches without
 pages

On Thu, 21 Jul 2011 09:38:00 +0200
Michal Hocko <mhocko@...e.cz> wrote:

> drain_all_stock_async tries to optimize a work to be done on the work
> queue by excluding any work for the current CPU because it assumes that
> the context we are called from already tried to charge from that cache
> and it's failed so it must be empty already.
> While the assumption is correct we can optimize it even more by checking
> the current number of pages in the cache. This will also reduce a work
> on other CPUs with an empty stock.
> For the current CPU we can simply call drain_local_stock rather than
> deferring it to the work queue.
> 
> [KAMEZAWA Hiroyuki - use drain_local_stock for current CPU optimization]
> Signed-off-by: Michal Hocko <mhocko@...e.cz>

Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>

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