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| author | Bob Liu <lliubbo@gmail.com> | 2010-10-26 14:22:10 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2010-10-26 16:52:11 -0700 |
| commit | f3ab2636c5c1dd9ab0ff53a46d8354d5769ffdd4 (patch) | |
| tree | 4173f57c2c37800dc5b3f5f08b294d560e645e9d | |
| parent | 809c444977adb7313e0612e9e3af4b73ba3f5746 (diff) | |
| download | lwn-f3ab2636c5c1dd9ab0ff53a46d8354d5769ffdd4.tar.gz lwn-f3ab2636c5c1dd9ab0ff53a46d8354d5769ffdd4.zip | |
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>
| -rw-r--r-- | mm/memory_hotplug.c | 21 |
1 files changed, 9 insertions, 12 deletions
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c index e4af144ee409..9260314a221e 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; } |