(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 <[email protected]> > Signed-off-by: Minchan Kim <[email protected]>
Sounds reasonable. Thank you very much ! Acked-by: KAMEZAWA Hiroyuki <[email protected]> -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
