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Commit b32eaf71 authored by Michal Hocko's avatar Michal Hocko Committed by Linus Torvalds
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mm: clarify COMPACTION Kconfig text 

The current wording of the COMPACTION Kconfig help text doesn't
emphasise that disabling COMPACTION might cripple the page allocator
which relies on the compaction quite heavily for high order requests and
an unexpected OOM can happen with the lack of compaction.  Make sure we
are vocal about that.

Link: http://lkml.kernel.org/r/20160823091726.GK23577@dhcp22.suse.cz


Signed-off-by: default avatarMichal Hocko <mhocko@suse.com>
Cc: Markus Trippelsdorf <markus@trippelsdorf.de>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Joonsoo Kim <js1304@gmail.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent a5ff1b34

mm/Kconfig

+8 −1
Original line number Diff line number Diff line
@@ -262,7 +262,14 @@ config COMPACTION 
	select MIGRATION

	depends on MMU

	help

	  Allows the compaction of memory for the allocation of huge pages.

          Compaction is the only memory management component to form

          high order (larger physically contiguous) memory blocks

          reliably. The page allocator relies on compaction heavily and

          the lack of the feature can lead to unexpected OOM killer

          invocations for high order memory requests. You shouldn't

          disable this option unless there really is a strong reason for

          it and then we would be really interested to hear about that at

          linux-mm@kvack.org.



#

# support for page migration