Re: [RFC 00/15] x86_64: Optimize percpu accesses

[H. Peter Anvin]

Eric W. Biederman wrote:
> Christoph Lameter <cl@xxxxxxxxxxxxxxxxxxxx> 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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