mm, memcg: bypass high reclaim iteration for cgroup hierarchy root
The root of the hierarchy cannot have high set, so we will never reclaim based on it. This makes that clearer and avoids another entry. Signed-off-by: Chris Down <chris@chrisdown.name> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Acked-by: Johannes Weiner <hannes@cmpxchg.org> Cc: Tejun Heo <tj@kernel.org> Cc: Roman Gushchin <guro@fb.com> Cc: Michal Hocko <mhocko@kernel.org> Link: http://lkml.kernel.org/r/20200312164137.GA1753625@chrisdown.name Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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