From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail137.messagelabs.com (mail137.messagelabs.com [216.82.249.19]) by kanga.kvack.org (Postfix) with ESMTP id CD8276B007E for ; Mon, 20 Jul 2009 11:48:58 -0400 (EDT) Received: from d03relay02.boulder.ibm.com (d03relay02.boulder.ibm.com [9.17.195.227]) by e36.co.us.ibm.com (8.13.1/8.13.1) with ESMTP id n6KFlP9V014334 for ; Mon, 20 Jul 2009 09:47:25 -0600 Received: from d03av04.boulder.ibm.com (d03av04.boulder.ibm.com [9.17.195.170]) by d03relay02.boulder.ibm.com (8.13.8/8.13.8/NCO v9.2) with ESMTP id n6KFn1LZ257458 for ; Mon, 20 Jul 2009 09:49:01 -0600 Received: from d03av04.boulder.ibm.com (loopback [127.0.0.1]) by d03av04.boulder.ibm.com (8.12.11.20060308/8.13.3) with ESMTP id n6KFn1me003168 for ; Mon, 20 Jul 2009 09:49:01 -0600 Date: Mon, 20 Jul 2009 21:18:59 +0530 From: Balbir Singh Subject: Re: [RFC][PATCH 0/5] Memory controller soft limit patches (v9) Message-ID: <20090720154859.GI24157@balbir.in.ibm.com> Reply-To: balbir@linux.vnet.ibm.com References: <20090710125950.5610.99139.sendpatchset@balbir-laptop> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline In-Reply-To: <20090710125950.5610.99139.sendpatchset@balbir-laptop> Sender: owner-linux-mm@kvack.org To: Andrew Morton , KAMEZAWA Hiroyuki Cc: linux-mm@kvack.org, lizf@cn.fujitsu.com, linux-kernel@vger.kernel.org, KOSAKI Motohiro List-ID: * Balbir Singh [2009-07-10 18:29:50]: > > From: Balbir Singh > > New Feature: Soft limits for memory resource controller. > > Here is v9 of the new soft limit implementation. Soft limits is a new feature > for the memory resource controller, something similar has existed in the > group scheduler in the form of shares. The CPU controllers interpretation > of shares is very different though. > > Soft limits are the most useful feature to have for environments where > the administrator wants to overcommit the system, such that only on memory > contention do the limits become active. The current soft limits implementation > provides a soft_limit_in_bytes interface for the memory controller and not > for memory+swap controller. The implementation maintains an RB-Tree of groups > that exceed their soft limit and starts reclaiming from the group that > exceeds this limit by the maximum amount. > > v9 attempts to address several review comments for v8 by Kamezawa, including > moving over to an event based approach for soft limit rb tree management, > simplification of data structure names and many others. Comments not > addressed have been answered via email or I've added comments in the code. > > TODOs > > 1. The current implementation maintains the delta from the soft limit > and pushes back groups to their soft limits, a ratio of delta/soft_limit > might be more useful > Hi, Andrew, Could you please pick up this patchset for testing in -mm, both Kamezawa-San and Kosaki-San have looked at the patches. I think they are ready for testing in mmotm. -- Balbir -- 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