Messages in this thread | | | From | "Luck, Tony" <> | Subject | RE: [RFC PATCH 10/12] mm: add the buddy system interface | Date | Thu, 4 Jun 2015 17:09:03 +0000 |
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+#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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