From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Thu, 21 Aug 2008 16:43:39 +0900 From: KAMEZAWA Hiroyuki Subject: Re: [discuss] memrlimit - potential applications that can use Message-Id: <20080821164339.679212b2.kamezawa.hiroyu@jp.fujitsu.com> In-Reply-To: <48ACE040.2030807@linux.vnet.ibm.com> References: <48AA73B5.7010302@linux.vnet.ibm.com> <1219161525.23641.125.camel@nimitz> <48AAF8C0.1010806@linux.vnet.ibm.com> <1219167669.23641.156.camel@nimitz> <48ABD545.8010209@linux.vnet.ibm.com> <1219249757.8960.22.camel@nimitz> <48ACE040.2030807@linux.vnet.ibm.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: owner-linux-mm@kvack.org Return-Path: To: balbir@linux.vnet.ibm.com Cc: Dave Hansen , Paul Menage , Dave Hansen , Andrea Righi , Hugh Dickins , Andrew Morton , Linux Memory Management List , linux kernel mailing list List-ID: On Thu, 21 Aug 2008 08:55:52 +0530 Balbir Singh wrote: > >>> So, before we expand the use of those features to control groups by > >>> adding a bunch of new code, let's make sure that there will be users > >> for > >>> it and that those users have no better way of doing it. > >> I am all ears to better ways of doing it. Are you suggesting that overcommit was > >> added even though we don't actually need it? > > > > It serves a purpose, certainly. We have have better ways of doing it > > now, though. "i>>?So, before we expand the use of those features to > > control groups by adding a bunch of new code, let's make sure that there > > will be users for it and that those users have no better way of doing > > it." > > > > The one concrete user that's been offered so far is postgres. I've > > No, you've been offered several, including php and apache that use memory limits. > > > suggested something that I hope will be more effective than enforcing > > overcommit. > I'm sorry I miss the point. My concern on memrlimit (for overcommiting) is that it's not fair because an application which get -ENOMEM at mmap() is just someone unlucky. I think it's better to trigger some notifier to application or daemon rather than return -ENOMEM at mmap(). Notification like "Oh, it seems the VSZ of total application exceeds the limit you set. Although you can continue your operation, it's recommended that you should fix up the situation". will be good. Thanks, -Kame -- 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