Messages in this thread | | | From | Namhyung Kim <> | Date | Thu, 29 Sep 2022 21:26:31 -0700 | Subject | Re: Invalid event (cycles:pp) in per-thread mode, enable system wide with '-a'. |
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Hello,
On Thu, Sep 29, 2022 at 8:49 PM Ian Rogers <irogers@google.com> wrote: > > On Thu, Sep 29, 2022 at 3:10 PM Slade Watkins <srw@sladewatkins.net> wrote: > > > > Hey Nick, > > > > > On Sep 29, 2022, at 5:54 PM, Nick Desaulniers <ndesaulniers@google.com> wrote: > > > > > > I remember hearing rumblings about issues with zen 2, LBR, vs zen 3. > > > Is this a known issue, or am I holding it wrong? > > > > Hm… I also remember this. I have a Zen 2 based system that I can do testing on, so I will do so when I’m able. > > > > If I discover something of note, I’ll get back to you. > > > > Cheers, > > -srw > > > > LBR isn't yet supported for Zen but is coming: > https://lore.kernel.org/lkml/166155216401.401.5809694678609694438.tip-bot2@tip-bot2/ > I'd recommend frame-pointers. > > +Ravi who may be able to say if there are any issues with the precise > sampling on AMD.
Afaik cvcles:pp will use IBS but it doesn't support per-task profiling since it has no task context. Ravi is working on it..
Thanks, Namhyung
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