Re: perf_fuzzer compiled for x32 causes reboot

[Ingo Molnar]

* Steven Rostedt <rostedt@xxxxxxxxxxx> wrote:

> > Also, this function is called a _LOT_ under certain workloads, I 
> > don't know how cheap a CR2 read is, but it had better be really 
> > cheap.
> 
> That's a HPA question.

We read CR2 in the page fault hot path, so it's on the top of CPU 
architects' minds and it's reasonably optimized. A couple of cycles 
IIRC, but would be nice to hear actual numbers.

Thanks,

	Ingo
--
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/