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authorIan Rogers <irogers@google.com>2025-10-01 11:12:28 -0700
committerArnaldo Carvalho de Melo <acme@redhat.com>2025-10-01 15:27:27 -0300
commitb91917c0c6fa6df97ec0222d8d6285ab2d60c21b (patch)
treec0a6367e97c7c6865ecf6e4d90f9db38875cbbf1 /scripts/lib/kdoc/kdoc_files.py
parent8c519a825b4add85b63531869d4a813511e6234b (diff)
perf bpf_counter: Fix handling of cpumap fixing hybrid
Don't open evsels on all CPUs, open them just on the CPUs they support. This avoids opening say an e-core event on a p-core and getting a failure - achieve this by getting rid of the "all_cpu_map". In install_pe functions don't use the cpu_map_idx as a CPU number, translate the cpu_map_idx, which is a dense index into the cpu_map skipping holes at the beginning, to a proper CPU number. Before: ``` $ perf stat --bpf-counters -a -e cycles,instructions -- sleep 1 Performance counter stats for 'system wide': <not supported> cpu_atom/cycles/ 566,270,672 cpu_core/cycles/ <not supported> cpu_atom/instructions/ 572,792,836 cpu_core/instructions/ # 1.01 insn per cycle 1.001595384 seconds time elapsed ``` After: ``` $ perf stat --bpf-counters -a -e cycles,instructions -- sleep 1 Performance counter stats for 'system wide': 443,299,201 cpu_atom/cycles/ 1,233,919,737 cpu_core/cycles/ 213,634,112 cpu_atom/instructions/ # 0.48 insn per cycle 2,758,965,527 cpu_core/instructions/ # 2.24 insn per cycle 1.001699485 seconds time elapsed ``` Fixes: 7fac83aaf2eecc9e ("perf stat: Introduce 'bperf' to share hardware PMCs with BPF") Signed-off-by: Ian Rogers <irogers@google.com> Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Athira Rajeev <atrajeev@linux.vnet.ibm.com> Cc: bpf@vger.kernel.org Cc: Gabriele Monaco <gmonaco@redhat.com> Cc: Howard Chu <howardchu95@gmail.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: James Clark <james.clark@linaro.org> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Song Liu <songliubraving@fb.com> Cc: Tengda Wu <wutengda@huaweicloud.com> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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