From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932278AbWJLOKs (ORCPT ); Thu, 12 Oct 2006 10:10:48 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932139AbWJLOK0 (ORCPT ); Thu, 12 Oct 2006 10:10:26 -0400 Received: from mx2.suse.de ([195.135.220.15]:10977 "EHLO mx2.suse.de") by vger.kernel.org with ESMTP id S1751423AbWJLOKG (ORCPT ); Thu, 12 Oct 2006 10:10:06 -0400 From: Nick Piggin To: Linux Memory Management Cc: Linux Kernel , Nick Piggin , Andrew Morton Message-Id: <20061012120129.29671.3288.sendpatchset@linux.site> In-Reply-To: <20061012120102.29671.31163.sendpatchset@linux.site> References: <20061012120102.29671.31163.sendpatchset@linux.site> Subject: [patch 3/5] oom: less memdie Date: Thu, 12 Oct 2006 16:10:01 +0200 (CEST) Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Don't cause all threads in all other thread groups to gain TIF_MEMDIE otherwise we'll get a thundering herd eating out memory reserve. This may not be the optimal scheme, but it fits our policy of allowing just one TIF_MEMDIE in the system at once. Signed-off-by: Nick Piggin Index: linux-2.6/mm/oom_kill.c =================================================================== --- linux-2.6.orig/mm/oom_kill.c +++ linux-2.6/mm/oom_kill.c @@ -322,11 +322,12 @@ static int oom_kill_task(struct task_str /* * kill all processes that share the ->mm (i.e. all threads), - * but are in a different thread group. + * but are in a different thread group. Don't let them have access + * to memory reserves though, otherwise we might deplete all memory. */ do_each_thread(g, q) { if (q->mm == mm && q->tgid != p->tgid) - __oom_kill_task(q, 1); + force_sig(SIGKILL, p); } while_each_thread(g, q); return 0;