On Fri, Apr 12, 2013 at 07:29:07AM +0800, Wanpeng Li wrote: > Ping Andi, > On Thu, Apr 04, 2013 at 05:09:08PM +0800, Wanpeng Li wrote: > >order >= MAX_ORDER pages are only allocated at boot stage using the > >bootmem allocator with the "hugepages=xxx" option. These pages are never > >free after boot by default since it would be a one-way street(>= MAX_ORDER > >pages cannot be allocated later), but if administrator confirm not to > >use these gigantic pages any more, these pinned pages will waste memory > >since other users can't grab free pages from gigantic hugetlb pool even > >if OOM, it's not flexible. The patchset add hugetlb gigantic page pools > >shrink supporting. Administrator can enable knob exported in sysctl to > >permit to shrink gigantic hugetlb pool. I originally didn't allow this because it's only one way and it seemed dubious. I've been recently working on a new patchkit to allocate GB pages from CMA. With that freeing actually makes sense, as the pages can be reallocated. -Andi -- 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>