Performance Counter Addresses

Robert O'Callahan robert at ocallahan.org
Mon Oct 5 01:46:29 UTC 2015


On Mon, Oct 5, 2015 at 2:40 PM, Downing, Evan P <edowning3 at gatech.edu>
wrote:

> > We don't use them by default.  There is a flag in PerfCounters.h
> > determining whether or not to use the extra counters.  I think this is
> > mostly a legacy of early experiments to move from
> > retired-conditional-branches to instructions-retired that are
> > essentially abandoned at this stage.
>
> Understood.
>
>
> > Can you use rr *outside* of QEMU?  And just record all of QEMU?
>
> To clarify a bit more: I am trying to use PANDA and rr together on a
> project to study the activities of Firefox. During this project I want to
> use rr as a coarse-grained analysis tool and PANDA as a fine-grained
> analysis tool. Because I'm using PANDA as a fine-grained analysis tool, I
> must have it running as rr is running inside the Linux guest.
> Unfortunately, PANDA is based on QEMU 1.0.1 and is not able to use KVM to
> record and replay QEMU activity.
>
>
> How should I combine these tools together to analyze Firefox's activities?
>
>

What kind of data are you trying to gather? It would seem to me that you
can just use PANDA and ignore rr.

Rob
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