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Date: Tue, 29 Oct 2024 17:02:27 -0700
From: Namhyung Kim <namhyung@kernel.org>
To: laksono <laksono@gmail.com>, Kan Liang <kan.liang@linux.intel.com>
Cc: linux-perf-users@vger.kernel.org
Subject: Re: Intel SPR: perf-record doesn't support topdown events?
Message-ID: <ZyF3k__jUtRUAcWm@google.com>
References: <CALwKgup1UhiKMHvEni_3gaWoC0BLu8kkT6R=7R=b-LkBx5_3ZA@mail.gmail.com>
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In-Reply-To: <CALwKgup1UhiKMHvEni_3gaWoC0BLu8kkT6R=7R=b-LkBx5_3ZA@mail.gmail.com>

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