Re: [RFC PATCH] x86, espfix: use spin_lock rather than mutex

[Andy Lutomirski]

On 05/15/2015 12:27 AM, H. Peter Anvin wrote:
> On 05/14/2015 11:54 PM, Ingo Molnar wrote:
> > The only slightly subtle detail with that is to use alloc_pages_node()
> > with the secondary CPU's node, to make sure the espfix stack is
> > NUMA-local to the CPU that is going to use it.
>
> It doesn't hurt, although it isn't super critical as each page will be
> shared among 64 CPUs.  The whole espfix stack is only a single cacheline
> long.

I don't think we actually need these pages allocated until we try to run 
user code.  Can we move this very late in initialization instead?

--Andy

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