linux-kernel - [RFC 0/4] OOM vs PM freezer fixes

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Date:	Wed, 12 Nov 2014 19:58:48 +0100
From:	Michal Hocko <mhocko@...e.cz>
To:	LKML <linux-kernel@...r.kernel.org>
Cc:	<linux-mm@...ck.org>, linux-pm@...r.kernel.org,
	Tejun Heo <tj@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"\\\"Rafael J. Wysocki\\\"" <rjw@...ysocki.net>,
	David Rientjes <rientjes@...gle.com>,
	Oleg Nesterov <oleg@...hat.com>,
	Cong Wang <xiyou.wangcong@...il.com>
Subject: [RFC 0/4] OOM vs PM freezer fixes

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(-)

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