KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx> writes: >> > My intention is not for allocating HUGEPAGE(> MAX_ORDER). >> >> I still believe using this for 1GB pages would be one of the more >> interesting use cases. >> > > I'm successfully allocating 1GB of continous pages at test. But I'm not sure > requirements and users. How quick this allocation should be ? This will always be slow. Huge pages are always pre allocated even today through a sysctl. The use case would be have echo XXX > /proc/sys/vm/nr_hugepages at runtime working for 1GB too, instead of requiring a reboot for this. I think it's ok if that is somewhat slow, as long as it is not incredible slow. Ideally it shouldn't cause a swap storm either (maybe we need some way to indicate how hard the freeing code should try?) I guess it would only really work well if you predefine movable zones at boot time. -Andi -- ak@xxxxxxxxxxxxxxx -- Speaking for myself only. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>