Re: Why preallocate pmd in x86 32-bit PAE?

[Andi Kleen]

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.

-Andi

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