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SubjectRe: [RFC 00/15] x86_64: Optimize percpu accesses
Mike Travis wrote:
>
> The discussion that followed was very emphatic that the size of the space should
> not be fixed, but instead be dynamically growable. Since the offset needs to be
> fixed for each cpu, then virtual (I think) is the only way to go. The use of a
> 2MB page just conserves map entries. (Of course, if we just reserved 2MB in the
> first place it might not need to be virtual...? But the concern was for systems
> with hundreds of (say) network interfaces using even more than 2MB.)
>

I'm much more concerned about wasting an average of 1 MB of memory per CPU.

-hpa


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