From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261782AbULJSBx (ORCPT ); Fri, 10 Dec 2004 13:01:53 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261777AbULJSBM (ORCPT ); Fri, 10 Dec 2004 13:01:12 -0500 Received: from holomorphy.com ([207.189.100.168]:46738 "EHLO holomorphy.com") by vger.kernel.org with ESMTP id S261782AbULJSAk (ORCPT ); Fri, 10 Dec 2004 13:00:40 -0500 Date: Fri, 10 Dec 2004 10:00:31 -0800 From: William Lee Irwin III To: Andrea Arcangeli Cc: Thomas Gleixner , Andrew Morton , marcelo.tosatti@cyclades.com, LKML , nickpiggin@yahoo.com.au Subject: Re: [PATCH] oom killer (Core) Message-ID: <20041210180031.GT2714@holomorphy.com> References: <20041202164725.GB32635@dualathlon.random> <20041202085518.58e0e8eb.akpm@osdl.org> <20041202180823.GD32635@dualathlon.random> <1102013716.13353.226.camel@tglx.tec.linutronix.de> <20041202233459.GF32635@dualathlon.random> <20041203022854.GL32635@dualathlon.random> <20041210163614.GN2714@holomorphy.com> <20041210173554.GW16322@dualathlon.random> <20041210174336.GP2714@holomorphy.com> <20041210175504.GY16322@dualathlon.random> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20041210175504.GY16322@dualathlon.random> Organization: The Domain of Holomorphy User-Agent: Mutt/1.5.6+20040722i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Dec 10, 2004 at 09:43:36AM -0800, William Lee Irwin III wrote: >> Well, the only way I see this happening is the process exiting followed >> by use_mm() on init_mm for unobvious reasons (perhaps reasons not in >> the tree). On Fri, Dec 10, 2004 at 06:55:04PM +0100, Andrea Arcangeli wrote: > I don't see the problem with use_mm. use_mm has either the mm set to > ctx->mm or to NULL, and ctx->mm is set to the mm of the process calling > io_setup. > The only thing using init_mm is the idle task/swapper as far as I can > tell, kernel threads and exiting tasks have a NULL mm. Yet those don't appear in the tasklist, so some task in the tasklist has to get ->mm set to &init_mm. The notion above was that the init_mm check was to handle some out-of-tree attempt to do aio from kernel threads. -- wli