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author | Kan Liang <[email protected]> | 2020-10-01 14:17:11 -0700 |
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committer | Peter Zijlstra <[email protected]> | 2020-10-03 16:30:56 +0200 |
commit | 80a5ce116fc084e8a25d5a936617699e2931b611 (patch) | |
tree | 20b77a33768ba881e9d9522171b8481263edcb97 /tools/perf/scripts/python/exported-sql-viewer.py | |
parent | 010cb00265f150bf82b23c02ad1fb87ce5c781e1 (diff) |
perf/x86/intel: Check perf metrics feature for each CPU
It might be possible that different CPUs have different CPU metrics on a
platform. In this case, writing the GLOBAL_CTRL_EN_PERF_METRICS bit to
the GLOBAL_CTRL register of a CPU, which doesn't support the TopDown
perf metrics feature, causes MSR access error.
Current TopDown perf metrics feature is enumerated using the boot CPU's
PERF_CAPABILITIES MSR. The MSR only indicates the boot CPU supports this
feature.
Check the PERF_CAPABILITIES MSR for each CPU. If any CPU doesn't support
the perf metrics feature, disable the feature globally.
Fixes: 59a854e2f3b9 ("perf/x86/intel: Support TopDown metrics on Ice Lake")
Signed-off-by: Kan Liang <[email protected]>
Signed-off-by: Peter Zijlstra (Intel) <[email protected]>
Link: https://lkml.kernel.org/r/[email protected]
Diffstat (limited to 'tools/perf/scripts/python/exported-sql-viewer.py')
0 files changed, 0 insertions, 0 deletions