Messages in this thread | | | Date | Fri, 16 Nov 2007 08:10:51 -0800 | From | "H. Peter Anvin" <> | Subject | Re: Why preallocate pmd in x86 32-bit PAE? |
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Andi Kleen wrote: > On Friday 16 November 2007 16:45:16 H. Peter Anvin wrote: >> Andi Kleen wrote: >>>> I think Jeremy's question was due to trying to reduce the 32/64-bit >>>> differences. Performance-wise, it might add a small amount to user >>>> setup time (a typical 32-bit process will need all four, for the main >>>> binary, libraries, stack and kernel, respectively) >>> With the new top down mmap layout and standard 3:1 split it should typically >>> only need two. >>> >> Well, three with the kernel. > > I didn't count kernel because it is always fixed anyways and about zero > overhead for the normal setup case. >
Of course, but it was in the original list so...
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