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| author | Kan Liang <kan.liang@linux.intel.com> | 2024-07-08 12:33:34 -0700 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2024-07-09 13:26:38 +0200 |
| commit | 556a7c039a52c21da33eaae9269984a1ef59189b (patch) | |
| tree | 82d17278a0470067d0f51e20bdba0beaccf38dc7 /Documentation | |
| parent | a5a6ff3d639d088d4af7e2935e1ee0d8b4e817d4 (diff) | |
perf/x86/intel: Hide Topdown metrics events if the feature is not enumerated
The below error is observed on Ice Lake VM.
$ perf stat
Error:
The sys_perf_event_open() syscall returned with 22 (Invalid argument)
for event (slots).
/bin/dmesg | grep -i perf may provide additional information.
In a virtualization env, the Topdown metrics and the slots event haven't
been supported yet. The guest CPUID doesn't enumerate them. However, the
current kernel unconditionally exposes the slots event and the Topdown
metrics events to sysfs, which misleads the perf tool and triggers the
error.
Hide the perf-metrics topdown events and the slots event if the
perf-metrics feature is not enumerated.
The big core of a hybrid platform can also supports the perf-metrics
feature. Fix the hybrid platform as well.
Closes: https://lore.kernel.org/lkml/CAM9d7cj8z+ryyzUHR+P1Dcpot2jjW+Qcc4CPQpfafTXN=LEU0Q@mail.gmail.com/
Reported-by: Dongli Zhang <dongli.zhang@oracle.com>
Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Tested-by: Dongli Zhang <dongli.zhang@oracle.com>
Link: https://lkml.kernel.org/r/20240708193336.1192217-2-kan.liang@linux.intel.com
Diffstat (limited to 'Documentation')
0 files changed, 0 insertions, 0 deletions