On Fri, Aug 22, 2014 at 09:34:30AM +0800, Zhang Yanfei wrote: >Hello Wanpeng > >On 08/22/2014 07:37 AM, Wanpeng Li wrote: >> 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. >>> >> >> More than one year past, If your allocate GB pages from CMA merged? > >commit 944d9fec8d7aee3f2e16573e9b6a16634b33f403 >Author: Luiz Capitulino <lcapitulino@xxxxxxxxxx> >Date: Wed Jun 4 16:07:13 2014 -0700 > > hugetlb: add support for gigantic page allocation at runtime > > Ah, thanks for your pointing out. Regards, Wanpeng Li >> >> 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 from this list: send the line "unsubscribe linux-kernel" in >> the body of a message to majordomo@xxxxxxxxxxxxxxx >> More majordomo info at http://vger.kernel.org/majordomo-info.html >> Please read the FAQ at http://www.tux.org/lkml/ >> . >> > > >-- >Thanks. >Zhang Yanfei > >-- >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>