From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx126.postini.com [74.125.245.126]) by kanga.kvack.org (Postfix) with SMTP id 3480A6B004F for ; Mon, 19 Dec 2011 11:11:44 -0500 (EST) Received: by yenq10 with SMTP id q10so4240477yen.14 for ; Mon, 19 Dec 2011 08:11:43 -0800 (PST) Message-ID: <4EEF6240.9020107@gmail.com> Date: Mon, 19 Dec 2011 11:11:44 -0500 From: KOSAKI Motohiro MIME-Version: 1.0 Subject: Re: Android low memory killer vs. memory pressure notifications References: <20111219025328.GA26249@oksana.dev.rtsoft.ru> In-Reply-To: <20111219025328.GA26249@oksana.dev.rtsoft.ru> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: Anton Vorontsov Cc: KOSAKI Motohiro , =?UTF-8?B?QXJ2ZSBIag==?= =?UTF-8?B?w7hubmV2w6Vn?= , Rik van Riel , Pavel Machek , Greg Kroah-Hartman , Andrew Morton , David Rientjes , Michal Hocko , John Stultz , linux-mm@kvack.org, linux-kernel@vger.kernel.org, KAMEZAWA Hiroyuki > - Use memory controller cgroup (CGROUP_MEM_RES_CTLR) notifications from > the kernel side, plus userland "manager" that would kill applications. > > The main downside of this approach is that mem_cg needs 20 bytes per > page (on a 32 bit machine). So on a 32 bit machine with 4K pages > that's approx. 0.5% of RAM, or, in other words, 5MB on a 1GB machine. > > 0.5% doesn't sound too bad, but 5MB does, quite a little bit. So, > mem_cg feels like an overkill for this simple task (see the driver at > the very bottom). Kamezawa-san, Is 20bytes/page still correct now? If I remember correctly, you improved space efficiency of memcg. -- 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/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: email@kvack.org