On Thu, Sep 11, 2014 at 06:30:04PM +0200, Michal Hocko wrote: > > I am wondering if the folllowing check makes any sense with regarding > > to rule out PM freeze: > > > > if ((!pm_nosig_freezing && !pm_freezing) && > > cgroup_freezing(current) && test_thread_flag(TIF_MEMDIE)) > > return true;
Doesn't this mean that if PM freezing and OOM killing race each other, the system may hang? Driver PM operation may try to allocate memory -> triggers OOM -> OOM killer selects an already frozen task -> nothing happens. I wonder whether OOM killing and PM operations should be mutually exclusive at a higher level. e.g. make OOM killing always override freezing but let hibernation abort operation before taking snapshot if OOM killing has happened since the beginning of the PM operation. Thanks. -- tejun -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/