Intel SPR: perf-record doesn't support topdown events?

Intel SPR: perf-record doesn't support topdown events?

[laksono]

All,

I am interested in using Intel TMA support in Linux perf. I can run

$ perf stat -e '{slots,topdown-be-bound}' ...

on Intel SPR with no problem, but running with perf record doesn't work:

$ perf record -e '{slots,topdown-be-bound}' ...
Error:
The sys_perf_event_open() syscall returned with 22 (Invalid argument)
for event (topdown-be-bound).

I suspect MSR_PERF_METRICS cannot be used in the perf_event sampling
mode. Could someone (probably from Intel) confirm?

My Linux kernel: 5.15.0-86-generic #96-Ubuntu (just in case this matters).

Regards

Laksono Adhianto

Re: Intel SPR: perf-record doesn't support topdown events?

[Namhyung Kim]

Hello,

Adding Kan to the circle.

On Tue, Oct 22, 2024 at 11:40:25AM -0500, laksono wrote:
> All,
> 
> I am interested in using Intel TMA support in Linux perf. I can run
> 
> $ perf stat -e '{slots,topdown-be-bound}' ...
> 
> on Intel SPR with no problem, but running with perf record doesn't work:
> 
> $ perf record -e '{slots,topdown-be-bound}' ...
> Error:
> The sys_perf_event_open() syscall returned with 22 (Invalid argument)
> for event (topdown-be-bound).
> 
> I suspect MSR_PERF_METRICS cannot be used in the perf_event sampling
> mode. Could someone (probably from Intel) confirm?

I guess you need the leader sampling with 'S' modifier.

  $ perf record -e '{slots,topdown-be-bound}:S' ...

Thanks,
Namhyung


> 
> My Linux kernel: 5.15.0-86-generic #96-Ubuntu (just in case this matters).
> 
> Regards
> 
> Laksono Adhianto

Re: Intel SPR: perf-record doesn't support topdown events?

[laksono]

Hi Namhyung

On Tue, Oct 29, 2024 at 7:02 PM Namhyung Kim <namhyung@kernel.org> wrote:
>
> I guess you need the leader sampling with 'S' modifier.
>
>   $ perf record -e '{slots,topdown-be-bound}:S' ...
>
Unfortunately, it doesn't work for me:

$ perf record -e '{slots,topdown-be-bound}:S'  ...
Error:
The sys_perf_event_open() syscall returned with 22 (Invalid argument)
for event (topdown-be-bound).
/bin/dmesg | grep -i perf may provide additional information.

Regards

Laksono

Re: Intel SPR: perf-record doesn't support topdown events?

[Liang, Kan]

On 2024-10-29 9:00 p.m., laksono wrote:
> Hi Namhyung
> 
> On Tue, Oct 29, 2024 at 7:02 PM Namhyung Kim <namhyung@kernel.org> wrote:
>>
>> I guess you need the leader sampling with 'S' modifier.
>>
>>   $ perf record -e '{slots,topdown-be-bound}:S' ...
>>
> Unfortunately, it doesn't work for me:

The issue should have been fixed by the below patch set.
https://lore.kernel.org/lkml/20240913084712.13861-1-dapeng1.mi@linux.intel.com/

You may have to use the latest perf-tools-next branch.

Thanks,
Kan
> 
> $ perf record -e '{slots,topdown-be-bound}:S'  ...
> Error:
> The sys_perf_event_open() syscall returned with 22 (Invalid argument)
> for event (topdown-be-bound).
> /bin/dmesg | grep -i perf may provide additional information.
> 
> Regards
> 
> Laksono
>