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authorBob Liu <lliubbo@gmail.com>2010-10-26 21:22:10 (GMT)
committerLinus Torvalds <torvalds@linux-foundation.org>2010-10-26 23:52:11 (GMT)
commitf3ab2636c5c1dd9ab0ff53a46d8354d5769ffdd4 (patch)
tree4173f57c2c37800dc5b3f5f08b294d560e645e9d /mm/memory_hotplug.c
parent809c444977adb7313e0612e9e3af4b73ba3f5746 (diff)
mm: do_migrate_range: reduce list_empty() check
Simple code for reducing list_empty(&source) check. Signed-off-by: Bob Liu <lliubbo@gmail.com> Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Acked-by: Wu Fengguang <fengguang.wu@intel.com> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Cc: Mel Gorman <mel@csn.ul.ie> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/memory_hotplug.c')
-rw-r--r--mm/memory_hotplug.c21
1 files changed, 9 insertions, 12 deletions
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index e4af144..9260314 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -705,24 +705,21 @@ do_migrate_range(unsigned long start_pfn, unsigned long end_pfn)
check this again here. */
if (page_count(page)) {
not_managed++;
+ ret = -EBUSY;
break;
}
}
}
- ret = -EBUSY;
- if (not_managed) {
- if (!list_empty(&source))
+ if (!list_empty(&source)) {
+ if (not_managed) {
+ putback_lru_pages(&source);
+ goto out;
+ }
+ /* this function returns # of failed pages */
+ ret = migrate_pages(&source, hotremove_migrate_alloc, 0, 1);
+ if (ret)
putback_lru_pages(&source);
- goto out;
}
- ret = 0;
- if (list_empty(&source))
- goto out;
- /* this function returns # of failed pages */
- ret = migrate_pages(&source, hotremove_migrate_alloc, 0, 1);
- if (ret)
- putback_lru_pages(&source);
-
out:
return ret;
}

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