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

[H. Peter Anvin]

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.

	-hpa

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