mm, thp: avoid excessive compaction latency during fault fix

mm, thp: avoid excessive compaction latency during fault fix

mm-thp-avoid-excessive-compaction-latency-during-fault.patch excludes sync
compaction for all high order allocations other than thp.  What we really
want to do is suppress sync compaction for thp, but only during the page
fault path.

Orders greater than PAGE_ALLOC_COSTLY_ORDER aren't necessarily going to
loop again so this is the only way to exhaust our capabilities before
declaring that we can't allocate.

Signed-off-by: David Rientjes <rientjes@google.com>
Reported-by: Hugh Dickins <hughd@google.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Greg Thelen <gthelen@google.com>
Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>