From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx157.postini.com [74.125.245.157]) by kanga.kvack.org (Postfix) with SMTP id 0C59E6B004D for ; Mon, 18 Jun 2012 09:12:09 -0400 (EDT) Message-ID: <4FDF2890.3020004@parallels.com> Date: Mon, 18 Jun 2012 17:09:36 +0400 From: Glauber Costa MIME-Version: 1.0 Subject: Re: [PATCH] mm/memcg: add unlikely to mercg->move_charge_at_immigrate References: <1340025022-7272-1-git-send-email-liwp.linux@gmail.com> In-Reply-To: <1340025022-7272-1-git-send-email-liwp.linux@gmail.com> Content-Type: text/plain; charset="ISO-8859-1"; format=flowed Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: Wanpeng Li Cc: Johannes Weiner , Michal Hocko , Balbir Singh , KAMEZAWA Hiroyuki , cgroups@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Gavin Shan On 06/18/2012 05:10 PM, Wanpeng Li wrote: > From: Wanpeng Li > > 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. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org