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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