From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-wg0-f49.google.com (mail-wg0-f49.google.com [74.125.82.49]) by kanga.kvack.org (Postfix) with ESMTP id 9E3F06B00E6 for ; Wed, 12 Nov 2014 13:58:59 -0500 (EST) Received: by mail-wg0-f49.google.com with SMTP id x13so14875901wgg.22 for ; Wed, 12 Nov 2014 10:58:59 -0800 (PST) Received: from mx2.suse.de (cantor2.suse.de. [195.135.220.15]) by mx.google.com with ESMTPS id bl1si41233682wjb.144.2014.11.12.10.58.58 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Wed, 12 Nov 2014 10:58:58 -0800 (PST) From: Michal Hocko Subject: [RFC 0/4] OOM vs PM freezer fixes Date: Wed, 12 Nov 2014 19:58:48 +0100 Message-Id: <1415818732-27712-1-git-send-email-mhocko@suse.cz> In-Reply-To: <20141110163055.GC18373@dhcp22.suse.cz> References: <20141110163055.GC18373@dhcp22.suse.cz> Sender: owner-linux-mm@kvack.org List-ID: To: LKML Cc: linux-mm@kvack.org, linux-pm@vger.kernel.org, Tejun Heo , Andrew Morton , "\\\"Rafael J. Wysocki\\\"" , David Rientjes , Oleg Nesterov , Cong Wang Hi, here is another take at OOM vs. PM freezer interaction fixes/cleanups. First three patches are fixes for an unlikely cases when OOM races with the PM freezer which should be closed completely finally. The last patch is a simple code enhancement which is not needed strictly speaking but it is nice to have IMO. Both OOM killer and PM freezer are quite subtle so I hope I haven't missing anything. Any feedback is highly appreciated. I am also interested about feedback for the used approach. To be honest I am not really happy about spreading TIF_MEMDIE checks into freezer (patch 1) but I didn't find any other way for detecting OOM killed tasks. Changes are based on top of Linus tree (3.18-rc3). Michal Hocko (4): OOM, PM: Do not miss OOM killed frozen tasks OOM, PM: make OOM detection in the freezer path raceless OOM, PM: handle pm freezer as an OOM victim correctly OOM: thaw the OOM victim if it is frozen Diffstat says: drivers/tty/sysrq.c | 6 ++-- include/linux/oom.h | 39 ++++++++++++++++------ kernel/freezer.c | 15 +++++++-- kernel/power/process.c | 60 +++++++++------------------------- mm/memcontrol.c | 4 ++- mm/oom_kill.c | 89 ++++++++++++++++++++++++++++++++++++++------------ mm/page_alloc.c | 32 +++++++++--------- 7 files changed, 147 insertions(+), 98 deletions(-) -- 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