Re: [PATCH 01/22] x86: add methods for writing of an MSR onseveral CPUs

[Borislav Petkov]

On Thu, May 21, 2009 at 10:38:01AM -0700, H. Peter Anvin wrote:
> Borislav Petkov wrote:
> > 
> > Well, let's do the nonserializing thing and have it done right from the
> > beginning. We might not care now but who knows..?
> > 
> 
> If nothing else it might matter for boot time.  Serializing *anything*
> across a large number of CPUs can be very expensive.

well, upon a closer look, smp_call_function_many() skips over the CPU
it is executing on and there's currently work in that area to extend
that API: http://marc.info/?l=linux-kernel&m=123979231511594&w=2.

However, according to Linus' comments, it looks like this would need a
bit of work so I guess we should wait with the concurrency stuff a bit,
no?

-- 
Regards/Gruss,
Boris.

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