From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752138AbZH1PId (ORCPT ); Fri, 28 Aug 2009 11:08:33 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752055AbZH1PIc (ORCPT ); Fri, 28 Aug 2009 11:08:32 -0400 Received: from e28smtp01.in.ibm.com ([59.145.155.1]:41197 "EHLO e28smtp01.in.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752038AbZH1PIc (ORCPT ); Fri, 28 Aug 2009 11:08:32 -0400 Date: Fri, 28 Aug 2009 20:38:29 +0530 From: Balbir Singh To: KAMEZAWA Hiroyuki Cc: "linux-mm@kvack.org" , "linux-kernel@vger.kernel.org" , "nishimura@mxp.nes.nec.co.jp" Subject: Re: [RFC][PATCH 1/5] memcg: change for softlimit. Message-ID: <20090828150829.GR4889@balbir.in.ibm.com> Reply-To: balbir@linux.vnet.ibm.com References: <20090828132015.10a42e40.kamezawa.hiroyu@jp.fujitsu.com> <20090828132321.e4a497bb.kamezawa.hiroyu@jp.fujitsu.com> <20090828072007.GH4889@balbir.in.ibm.com> <20090828163523.e51678be.kamezawa.hiroyu@jp.fujitsu.com> <20090828132643.GM4889@balbir.in.ibm.com> <712c0209222358d9c7d1e33f93e21c30.squirrel@webmail-b.css.fujitsu.com> <20090828144648.GO4889@balbir.in.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.18 (2008-05-17) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org * KAMEZAWA Hiroyuki [2009-08-29 00:06:23]: > Balbir Singh wrote: > > * KAMEZAWA Hiroyuki [2009-08-28 > > 23:40:56]: > > > >> KAMEZAWA Hiroyuki wrote: > >> > Balbir Singh wrote: > >> >> But Bob and Mike might need to set soft limits between themselves. if > >> >> soft limit of gold is 1G and bob needs to be close to 750M and mike > >> >> 250M, how do we do it without supporting what we have today? > >> >> > >> > Don't use hierarchy or don't use softlimit. > >> > (I never think fine-grain soft limit can be useful.) > >> > > >> > Anyway, I have to modify unnecessary hacks for res_counter of > >> softlimit. > >> > plz allow modification. that's bad. > >> > I postpone RB-tree breakage problem, plz explain it or fix it by > >> yourself. > >> > > >> I changed my mind....per-zone RB-tree is also broken ;) > >> > >> Why I don't like broken system is a function which a user can't > >> know/calculate how-it-works is of no use in mission critical systems. > >> > >> I'd like to think how-to-fix it with better algorithm. Maybe RB-tree > >> is not a choice. > >> > > > > Soft limits are not meant for mission critical work :-) Soft limits is > > best effort and not a guaranteed resource allocation mechanism. I've > > mentioned in previous emails how we recover if we find the data is > > stale > > > yes. but can you explain how selection will be done to users ? > I can't. > >>From a user point, we get what we set, but the timelines can be a little longer. -- Balbir