From: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Date: Mon, 7 Apr 2014 22:37:03 +0000 (-0700)
Subject: mm/compaction: disallow high-order page for migration target
X-Git-Tag: v3.15-rc1~57^2~146
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7d348b9ea64db0a315d777ce7d4b06697f946503;p=pandora-kernel.git

mm/compaction: disallow high-order page for migration target

Purpose of compaction is to get a high order page.  Currently, if we
find high-order page while searching migration target page, we break it
to order-0 pages and use them as migration target.  It is contrary to
purpose of compaction, so disallow high-order page to be used for
migration target.

Additionally, clean-up logic in suitable_migration_target() to simplify
the code.  There is no functional changes from this clean-up.

Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Rik van Riel <riel@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

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