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SubjectRe: [RFC 00/15] x86_64: Optimize percpu accesses
Christoph Lameter wrote:
> Jeremy Fitzhardinge wrote:
>
>> Percpu on i386 hasn't been a point of discussion. It works fine, and
>> has been working fine for a long time. The same mechanism would work
>> fine on x86-64. Its only "issue" is that it doesn't support the broken
>> gcc abi for stack-protector.
>
> Well that is one thing and then the scaling issues, and the support of the new cpu allocator, new arch independent cpu operations etc.
>
>> The problem is all zero-based percpu on x86-64.
>
> The zero based stuff will enable a lot of things. Please have a look at the cpu_alloc patchsets.
>

No argument this work is worthwhile. The main issues on the table is
the particular choice of offsets, and the handling of the virtual space
-- I believe 2 MB mappings are too large, except perhaps as an option.

-hpa



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