Messages in this thread | | | Date | Thu, 18 Dec 2014 09:25:40 -0800 | From | "H. Peter Anvin" <> | Subject | Re: [PATCH v2] X86-32: Allocate 256 bytes for pgd in PAE paging |
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On 12/17/2014 01:47 PM, Fenghua Yu wrote: > From: Fenghua Yu <fenghua.yu@intel.com> > > X86 32-bit machine and kernel use PAE paging, which currently wastes about > 4K of memory per process on Linux where we have to reserve an entire page to > support a single 256-byte PGD structure. It would be a very good thing if > we could eliminate that wastage. >
4*8 = 32 bytes, where did 256 bytes come from?
-hpa
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