perf stat: Support metrics with hybrid events
One metric such as 'Kernel_Utilization' may be from different PMUs and consists of different events. For core, Kernel_Utilization = cpu_clk_unhalted.thread:k / cpu_clk_unhalted.thread For atom, Kernel_Utilization = cpu_clk_unhalted.core:k / cpu_clk_unhalted.core The metric group string for core is: '{cpu_clk_unhalted.thread/metric-id=cpu_clk_unhalted.thread:k/k,cpu_clk_unhalted.thread/metric-id=cpu_clk_unhalted.thread/}:W' It's internally expanded to: '{cpu_clk_unhalted.thread_p/metric-id=cpu_clk_unhalted.thread_p:k/k,cpu_clk_unhalted.thread/metric-id=cpu_clk_unhalted.thread/}:W#cpu_core' The metric group string for atom is: '{cpu_clk_unhalted.core/metric-id=cpu_clk_unhalted.core:k/k,cpu_clk_unhalted.core/metric-id=cpu_clk_unhalted.core/}:W' It's internally expanded to: '{cpu_clk_unhalted.core/metric-id=cpu_clk_unhalted.core:k/k,cpu_clk_unhalted.core/metric-id=cpu_clk_unhalted.core/}:W#cpu_atom' That means the group "{cpu_clk_unhalted.thread:k,cpu_clk_unhalted.thread}:W" is from cpu_core PMU and the group "{cpu_clk_unhalted.core:k,cpu_clk_unhalted.core}" is from cpu_atom PMU. And then next, check if the events in the group are valid on that PMU. If one event is not valid on that PMU, the associated group would be removed internally. In this example, cpu_clk_unhalted.thread is valid on cpu_core and cpu_clk_unhalted.core is valid on cpu_atom. So the checks for these two groups are passed. Before: # ./perf stat -M Kernel_Utilization -a sleep 1 WARNING: events in group from different hybrid PMUs! WARNING: grouped events cpus do not match, disabling group: anon group { CPU_CLK_UNHALTED.THREAD_P:k, CPU_CLK_UNHALTED.THREAD_P:k, CPU_CLK_UNHALTED.THREAD, CPU_CLK_UNHALTED.THREAD } Performance counter stats for 'system wide': 17,639,501 cpu_atom/CPU_CLK_UNHALTED.CORE/ # 1.00 Kernel_Utilization 17,578,757 cpu_atom/CPU_CLK_UNHALTED.CORE:k/ 1,005,350,226 ns duration_time 43,012,352 cpu_core/CPU_CLK_UNHALTED.THREAD_P:k/ # 0.99 Kernel_Utilization 17,608,010 cpu_atom/CPU_CLK_UNHALTED.THREAD_P:k/ 43,608,755 cpu_core/CPU_CLK_UNHALTED.THREAD/ 17,630,838 cpu_atom/CPU_CLK_UNHALTED.THREAD/ 1,005,350,226 ns duration_time 1.005350226 seconds time elapsed After: # ./perf stat -M Kernel_Utilization -a sleep 1 Performance counter stats for 'system wide': 17,981,895 CPU_CLK_UNHALTED.CORE [cpu_atom] # 1.00 Kernel_Utilization 17,925,405 CPU_CLK_UNHALTED.CORE:k [cpu_atom] 1,004,811,366 ns duration_time 41,246,425 CPU_CLK_UNHALTED.THREAD_P:k [cpu_core] # 0.99 Kernel_Utilization 41,819,129 CPU_CLK_UNHALTED.THREAD [cpu_core] 1,004,811,366 ns duration_time 1.004811366 seconds time elapsed Reviewed-by: Kan Liang <kan.liang@linux.intel.com> Signed-off-by: Xing Zhengjun <zhengjun.xing@linux.intel.com> Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Alexander Shishkin <alexander.shishkin@intel.com> Cc: Andi Kleen <ak@linux.intel.com> Cc: Ian Rogers <irogers@google.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Link: https://lore.kernel.org/r/20220422065635.767648-1-zhengjun.xing@linux.intel.comSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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