From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Sat, 28 Aug 2004 15:13:49 -0700 From: Andrew Morton Subject: Re: Kernel 2.6.8.1: swap storm of death - nr_requests > 1024 on swap partition Message-Id: <20040828151349.00f742f4.akpm@osdl.org> In-Reply-To: <20040828215411.GY5492@holomorphy.com> References: <20040824124356.GW2355@suse.de> <412CDE7E.9060307@seagha.com> <20040826144155.GH2912@suse.de> <412E13DB.6040102@seagha.com> <412E31EE.3090102@pandora.be> <41308C62.7030904@seagha.com> <20040828125028.2fa2a12b.akpm@osdl.org> <4130F55A.90705@pandora.be> <20040828144303.0ae2bebe.akpm@osdl.org> <20040828215411.GY5492@holomorphy.com> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org Return-Path: To: William Lee Irwin III Cc: karl.vogel@pandora.be, axboe@suse.de, linux-mm@kvack.org List-ID: William Lee Irwin III wrote: > > Karl Vogel wrote: > >> With overcommit_memory set to 1, the program can be run again after the > >> OOM kill.. but the OOM killing remains. > >> With overcommit_memory set to 0 a second run fails. I 'think' it's > >> because somehow SwapCache is 500Kb after the OOM, so in effect my system > >> doesn't have 1Gb to spare anymore. Doing swapoff/swapon frees this and > >> then I can do the calloc(1Gb) again. > >> Another way to free the SwapCached is to generate lots of I/O doing 'dd > >> if=/dev/hda of=/dev/null' ... after a while SwapCached is < 1Mb again. > > On Sat, Aug 28, 2004 at 02:43:03PM -0700, Andrew Morton wrote: > > urgh. It sounds like the overcommit logic forgot to account swapcache as > > reclaimable. It's been a ton of trouble, that code. > > For overcommit purposes, swapcache still counts as committed AS; it > requires swap as backing store to evict. So AFAICT there isn't an issue > there. But that backing store is allocated? > I was under the impression this had something to do with IO > schedulers. Separate issue. -- 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: aart@kvack.org