Hi Andi, On Fri, Apr 12, 2013 at 05:22:37PM +0200, Andi Kleen wrote: >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. How is your allocate hugetlb pages from CMA going on? If you don't have time I will have a try. ;-) Regards, Wanpeng Li > >-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> -- 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>