On Wed, May 30, 2012 at 02:41:22PM -0500, Christoph Lameter wrote: > On Wed, 30 May 2012, kosaki.motohiro@xxxxxxxxx wrote: > > > refcount will be decreased even though was not increased whenever alloc_page_vma() > > is called. As you know, mere mbind(MPOL_MF_MOVE) calls alloc_page_vma(). > > Most of these issues are about memory migration and shared memory. If we > exempt shared memory from memory migration (after all that shared memory > has its own distinct memory policies already!) then a lot of these issues > wont arise. Soft memory offlining needs migration. It's fairly important that this works: on the database systems most memory is in shared memory and they have a lot of memory, so predictive failure analysis and soft offlining helps a lot. Classic migration is probably not too important here, but they pretty much rely on the same low level mechanism. -Andi -- ak@xxxxxxxxxxxxxxx -- Speaking for myself only. -- 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/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>