From: Ravi Bangoria <ravi.bangoria@amd.com>
To: Nick Desaulniers <ndesaulniers@google.com>
Cc: Slade Watkins <srw@sladewatkins.net>,
linux-perf-users <linux-perf-users@vger.kernel.org>,
LKML <linux-kernel@vger.kernel.org>,
Ian Rogers <irogers@google.com>,
Namhyung Kim <namhyung@gmail.com>,
Ravi Bangoria <ravi.bangoria@amd.com>
Subject: Re: Invalid event (cycles:pp) in per-thread mode, enable system wide with '-a'.
Date: Fri, 30 Sep 2022 10:01:59 +0530 [thread overview]
Message-ID: <e553c4f8-ed3d-0755-cc8a-b5ffe43b2c2f@amd.com> (raw)
In-Reply-To: <CAM9d7chvZjZ4YVc6j3w7OkdHteyJ0GUZboieu9G7jAWBevoZqA@mail.gmail.com>
On 30-Sep-22 9:56 AM, Namhyung Kim wrote:
> 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..
Right.
https://lore.kernel.org/lkml/20220829113347.295-1-ravi.bangoria@amd.com
Thanks,
Ravi
next prev parent reply other threads:[~2022-09-30 4:32 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-09-29 21:54 Nick Desaulniers
2022-09-29 22:10 ` Slade Watkins
2022-09-30 3:23 ` Ian Rogers
2022-09-30 4:26 ` Namhyung Kim
2022-09-30 4:31 ` Ravi Bangoria [this message]
2022-10-05 21:55 ` Nick Desaulniers
2022-10-05 22:50 ` Stephane Eranian
2022-10-07 3:56 ` Ravi Bangoria
2022-10-11 21:32 ` Nick Desaulniers
2022-10-12 4:06 ` Ravi Bangoria
2022-10-12 5:04 ` Ravi Bangoria
2023-06-23 16:23 ` Nick Desaulniers
2023-06-23 23:18 ` Namhyung Kim
2023-06-26 5:44 ` Ravi Bangoria
2023-07-10 21:22 ` Nick Desaulniers
2023-07-11 5:14 ` Ravi Bangoria
2022-10-11 21:38 ` Nick Desaulniers
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