Re: [PATCHSET] stop_machine: implementstop_machine_from_offline_cpu()

[Tejun Heo]

Hello, Peter.

On Thu, Jun 16, 2011 at 02:10:19PM +0200, Peter Zijlstra wrote:
> Maybe a silly question, but why does mtrr need all this? Surely mtrr can
> serialize state by other means than stopping all cpus. A simple mutex
> around the shared state blocking other cpus from updating the mtrr state
> while we're copying the state to our newly born cpu should cure things.

Hmmm... good question.  I don't know mtrr too well either but the
stop-machine requirement seems to directly come from intel's
specification.  I suppose Suresh can fill us in better.

Thanks.

-- 
tejun
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/