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?
Date: Tue, 29 Oct 2024 17:02:27 -0700 [thread overview]
Message-ID: <ZyF3k__jUtRUAcWm@google.com> (raw)
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
next prev parent reply other threads:[~2024-10-30 0:02 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-10-22 16:40 Intel SPR: perf-record doesn't support topdown events? laksono
2024-10-30 0:02 ` Namhyung Kim [this message]
2024-10-30 1:00 ` laksono
2024-10-30 12:57 ` Liang, Kan
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