Hi Naoya, On 03/21/2013 06:05 AM, Naoya Horiguchi wrote: > On Wed, Mar 20, 2013 at 09:03:20AM +0800, Simon Jeons wrote: >> Hi Naoya, >> On 02/22/2013 03:41 AM, Naoya Horiguchi wrote: >>> Currently we can't offline memory blocks which contain hugepages because >>> a hugepage is considered as an unmovable page. But now with this patch >>> series, a hugepage has become movable, so by using hugepage migration we >>> can offline such memory blocks. >>> >>> What's different from other users of hugepage migration is that we need >>> to decompose all the hugepages inside the target memory block into free >> For other hugepage migration users, hugepage should be freed to >> hugepage_freelists after migration, but why I don't see any codes do >> this? > The source hugepages which are migrated by NUMA related system calls > (migrate_pages(2), move_pages(2), and mbind(2)) are still useable, > so we simply free them into free hugepage pool. It seems that you misunderstand why I confuse. I can't find where free huge pages to hugepage pool, could you point out to me? > OTOH, the source hugepages migrated by memory hotremove should not be > reusable, because users of memory hotremove want to remove the memory > from the system. So we need to free such hugepages forcibly into the > buddy pages, otherwise memory offining doesn't work. > > Thanks, > Naoya -- 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>