oom, oom_reaper: try to reap tasks which skip regular OOM killer path

If either the current task is already killed or PF_EXITING or a selected
task is PF_EXITING then the oom killer is suppressed and so is the oom
reaper.  This patch adds try_oom_reaper which checks the given task and
queues it for the oom reaper if that is safe to be done meaning that the
task doesn't share the mm with an alive process.

This might help to release the memory pressure while the task tries to
exit.

[[email protected]: fix nommu build]
Signed-off-by: Michal Hocko <[email protected]>
Cc: Raushaniya Maksudova <[email protected]>
Cc: Michael S. Tsirkin <[email protected]>
Cc: Paul E. McKenney <[email protected]>
Cc: David Rientjes <[email protected]>
Cc: Tetsuo Handa <[email protected]>
Cc: Daniel Vetter <[email protected]>
Cc: Oleg Nesterov <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

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