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SubjectRe: [RFC 00/15] x86_64: Optimize percpu accesses
Eric W. Biederman wrote:
> Christoph Lameter <cl@linux-foundation.org> writes:
>
>> H. Peter Anvin wrote:
>>
>>> but there is a distinct lack of wiggle room, which can be resolved
>>> either by using negative offsets, or by moving the kernel text area up a
>>> bit from -2 GB.
>> Lets say we reserve 256MB of cpu alloc space per processor.
>
> First off right now reserving more than about 64KB is ridiculous. We rightly
> don't have that many per cpu variables.

Almost half a megabyte in current allyesconfig, and that is not
including dynamic allocations at all.

-hpa


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