Messages in this thread | | | Subject | Re: [RFC][PATCH 10/11] perf, x86: use LBR for PEBS IP+1 fixup | From | Peter Zijlstra <> | Date | Thu, 04 Mar 2010 09:57:26 +0100 |
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On Wed, 2010-03-03 at 22:50 +0100, Stephane Eranian wrote:
> I think systematically and transparently using LBR to correct PEBS off-by-one > problem is not such a good idea. You've basically highjacked LBR and user > cannot use it in a different way.
Well, they could, it just makes scheduling the stuff more interesting.
> There are PEBS+LBR measurements where you care about extracting the LBR data. > There are PEBS measurements where you don't care about getting the correct IP. > I don't necessarily want to pay the price, especially when this could > be done offline in the tool.
There are some people who argue that fixing up that +1 insn issue is critical, sadly they don't appear to want to argue their case in public. What we can do is make it optional I guess.
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