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From: Stephan Dollberg <stephan.dollberg@gmail.com>
To: linux-perf-users@vger.kernel.org
Subject: perf stat --smi-cost not working on hybrid/alder lake
Date: Sun, 9 Oct 2022 09:28:04 +0100	[thread overview]
Message-ID: <CAE4R7x2JMHroRyPNMsy5_wnOnsRE9c+UCsmXRJrODhT3PjVUxg@mail.gmail.com> (raw)

Hi,

perf stat --smi-cost does not work on AlderLake/hybrid-arches:

```
$ perf stat --smi-cost -C 1 -- sleep 1
freeze_on_smi is not supported.
```

Caused by FREEZE_ON_SMI_PATH being hardcoded to "devices/cpu/freeze_on_smi"

https://github.com/torvalds/linux/blob/3002b7a31894cfa0e57080f7e0961b5fee788aa3/tools/perf/builtin-stat.c#L98

However, on hybrid the devices subtree looks like:

```
$ ls -h /sys/devices/ | grep cpu_
cpu_atom
cpu_core
```

I tried a hacked build by changing that path to
"devices/cpu_core/freeze_on_smi" but even then didn't get any output
even on the "core" cores.

Happy to help with further debugging.

Cheers,
Stephan

                 reply	other threads:[~2022-10-09  8:28 UTC|newest]

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