From: Ravi Bangoria <ravi.bangoria@amd.com>
To: Nick Desaulniers <ndesaulniers@google.com>,
Namhyung Kim <namhyung@gmail.com>
Cc: Stephane Eranian <eranian@google.com>,
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>,
Kees Cook <keescook@chromium.org>,
sandipan.das@amd.com, Bill Wendling <morbo@google.com>,
clang-built-linux <llvm@lists.linux.dev>,
Yonghong Song <yhs@fb.com>, Peter Zijlstra <peterz@infradead.org>,
Ravi Bangoria <ravi.bangoria@amd.com>
Subject: Re: Invalid event (cycles:pp) in per-thread mode, enable system wide with '-a'.
Date: Tue, 11 Jul 2023 10:44:52 +0530 [thread overview]
Message-ID: <5acc07fe-d161-2977-29ab-1096afeefc4c@amd.com> (raw)
In-Reply-To: <CAKwvOdm9SAQ5i74JUzWP4Q1WW3aHq+3Jo7hqfie+oMxjnKqxSA@mail.gmail.com>
On 11-Jul-23 2:52 AM, Nick Desaulniers wrote:
> On Sun, Jun 25, 2023 at 10:45 PM Ravi Bangoria <ravi.bangoria@amd.com> wrote:
>>
>> Hi Nick,
>>
>> On 23-Jun-23 9:53 PM, Nick Desaulniers wrote:
>>>>> On 12-Oct-22 3:02 AM, Nick Desaulniers wrote:
>>> Hi Ravi,
>>> Sorry, I'm not able to load a custom kernel image on my employer
>>> provided workstation, and I never got approval to expense hardware for
>>> testing this otherwise.
>>>
>>> Was there ever any update on this? I'm on 6.1.25 now and still cant run
>>> $ perf record -e cycles:pp --call-graph lbr <any command to profile>
>>
>> Per-process precise sampling on AMD platforms should work from 6.2-rc1
>> onward.
>
> Ok, I can wait for my employer to ship 6.2 on our workstations.
>
>> However, --call-graph=lbr is not supported on AMD (hw limitation).
>
> On any AMD uarches? Is there an equivalent? LBR encoding is compact
> which makes working it much faster than DWARF or stack frame
> unwinding.
I understand that LBR call-stack is the fastest option but unfortunately
none of the current AMD uarch supports it.
Thanks,
Ravi
next prev parent reply other threads:[~2023-07-11 5:16 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-09-29 21:54 Invalid event (cycles:pp) in per-thread mode, enable system wide with '-a' 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
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 [this message]
2022-10-11 21:38 ` Nick Desaulniers
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