(2012/09/07 9:39), Minchan Kim wrote: > If race between allocation and isolation in memory-hotplug offline > happens, some pages could be in MIGRATE_MOVABLE of free_list although > the pageblock's migratetype of the page is MIGRATE_ISOLATE. > > The race could be detected by get_freepage_migratetype > in __test_page_isolated_in_pageblock. If it is detected, now EBUSY > gets bubbled all the way up and the hotplug operations fails. > > But better idea is instead of returning and failing memory-hotremove, > move the free page to the correct list at the time it is detected. > It could enhance memory-hotremove operation success ratio although > the race is really rare. > > Suggested-by: Mel Gorman <mgorman@xxxxxxx> > Signed-off-by: Minchan Kim <minchan@xxxxxxxxxx> Sounds reasonable. Thank you very much ! Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx> -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>