linux-kernel - Re: [PATCH] mm/memcg: add unlikely to mercg->move_charge_at

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Message-ID: <4FDF2890.3020004@parallels.com>
Date:	Mon, 18 Jun 2012 17:09:36 +0400
From:	Glauber Costa <glommer@...allels.com>
To:	Wanpeng Li <liwp.linux@...il.com>
CC:	Johannes Weiner <hannes@...xchg.org>,
	Michal Hocko <mhocko@...e.cz>,
	Balbir Singh <bsingharora@...il.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	<cgroups@...r.kernel.org>, <linux-mm@...ck.org>,
	<linux-kernel@...r.kernel.org>,
	Gavin Shan <shangw@...ux.vnet.ibm.com>
Subject: Re: [PATCH] mm/memcg: add unlikely to mercg->move_charge_at_immigrate

On 06/18/2012 05:10 PM, Wanpeng Li wrote:
> From: Wanpeng Li <liwp@...ux.vnet.ibm.com>
>
> move_charge_at_immigrate feature is disabled by default. Charges
> are moved only when you move mm->owner and it also add additional
> overhead.

How big is this overhead?

That's hardly a fast path. And if it happens to matter, it will be just 
bigger when you enable it, and the compiler start giving the wrong hints 
to the code.
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