RE: [RFC PATCH 10/12] mm: add the buddy system interface

[Luck, Tony]

+#ifdef CONFIG_MEMORY_MIRROR
+	if (change_to_mirror(gfp_mask, ac.high_zoneidx))
+		ac.migratetype = MIGRATE_MIRROR;
+#endif

We may have to be smarter than this here. I'd like to encourage the
enterprise Linux distributions to set CONFIG_MEMORY_MIRROR=y
But the reality is that most systems will not configure any mirrored
memory - so we don't want the common code path for memory
allocation to call functions that set the migrate type, try to allocate
and then fall back to a non-mirror when that may be a complete waste
of time.

Maybe a global "got_mirror" that is true if we have some mirrored
memory.  Then code is

	if (got_mirror && change_to_mirror(...))
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