Re: [PATCH 3/3] x86, vdso32: handle 32 bit vDSO larger one page

[H. Peter Anvin]

On 03/13/2014 10:28 AM, Andy Lutomirski wrote:
> 
> Does this mean you prefer the relocation approach to the compat vdso
> removal approach?  It seems like Linus is okay with either one.
> 

Actually, thinking about it, removing it is probably better:

a) gets rid of legacy code, making room for unification;
b) either way enabling compat support (either relocation or disabling
   the vdso) has a performance penalty for *all* processes.

The only way to avoid that is to have a vdso at a fixed addresses across
all processes, either in the fixmap or in the user area (presumably at
the very top.)

	-hpa

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