Re: [PATCH 06/14] perf, x86: PEBS infrastructure

From: Stephane Eranian
Date: Fri Mar 05 2010 - 14:51:41 EST

On Fri, Mar 5, 2010 at 11:39 AM, Peter Zijlstra <peterz@xxxxxxxxxxxxx> wrote:
> On Fri, 2010-03-05 at 11:11 -0800, Stephane Eranian wrote:
>> By rewinding you get the IP of the instruction that caused the event. But the
>> register state is STILL reflecting the situation at retirement of that
>> instruction.
> I'm quite aware of that, but its near impossible to reverse interpret
> instructions such as "mov rdx, $rdx", so until we get fault like PEBS
> we'll just have to live with this.
I am sure you are, but that's not necessarily true of everybody.
So this needs to be clearly spelled out in some documentation
about precise + your MISC_EXACT bit.
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