mm: memcontrol: clarify migration where old page is uncharged
Better explain re-entrant migration when compaction races with reclaim, and also mention swapcache readahead pages as possible uncharged migration sources. Signed-off-by: NJohannes Weiner <hannes@cmpxchg.org> Cc: Hugh Dickins <hughd@google.com> Acked-by: NMichal Hocko <mhocko@suse.cz> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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