Messages in this thread | | | Date | Fri, 26 Apr 2013 09:56:02 +0200 | From | Peter Zijlstra <> | Subject | Re: [PATCH 1/2] Fix perf LBR filtering |
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On Thu, Apr 25, 2013 at 07:42:11PM +0200, Andi Kleen wrote: > There's the non cachable region tracking. But there's no guarantee a > MMIO has to be in there, driver may still rely just on MTRRs. Also > there may be MMIOs the kernel doesn't know about which just happen > to be somewhere in the direct mapping. > > I don't see any reliable way to detect all mmios.
Hmm.. that's unfortunate.
OK, so how about we use something like:
is_kernel_text() || is_module_text_address()
And bail if not; that should at least make it work for the simple case or normal text and not be worse than what you propose for JIT stuff.
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