Looks much better. Thanks! I am wondering whether we want to have this
marked for stable. The patch is quite non-intrusive and fires only when
we are really OOM. It is definitely better to try harder than go and
disrupt the system by the OOM killer. So I would add
Fixes: 0aaa29a56e4f ("mm, page_alloc: reserve pageblocks for high-order atomic 
allocations on demand")
Cc: stable # 4.4+

The backport will look slightly different for kernels prior 4.6 because
we do not have should_reclaim_retry yet but the check might hook right
before __alloc_pages_may_oom.
Michal Hocko

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