Re: Support variable-sized huge pages

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On Mon, Feb 04, 2013 at 11:48:46PM -0600, Ric Mason wrote:
> Hi Andi,
> On Thu, 2013-01-31 at 11:52 +0100, Andi Kleen wrote:
> > On Thu, Jan 31, 2013 at 02:23:10AM -0600, Ric Mason wrote:
> > > Hi all,
> > > 
> > > It seems that Andi's "Support more pagesizes for
> > > MAP_HUGETLB/SHM_HUGETLB" patch has already merged. According to the
> > > patch, x86 will support 2MB and 1GB huge pages. But I just see 
> > > hugepages-2048kB under /sys/kernel/mm/hugepages/ on my x86_32 PAE desktop.
> > > Where is 1GB huge pages?
> > 
> > 1GB pages are only supported under 64bit kernels, and also
> > only if you allocate them explicitely with boot options.
> 
> I am curious about how can buddy system alloc 1GB huge pages? the most
> order buddy system supports is 10. Could you explain to me? 

It can't, that is why you can only allocate them at boot time.

-Andi

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