• Sandipan Das's avatar
    perf vendor events amd: Fix large metrics · 8d40f74e
    Sandipan Das authored
    There are cases where a metric requires more events than the number of
    available counters. E.g. AMD Zen, Zen 2 and Zen 3 processors have four
    data fabric counters but the "nps1_die_to_dram" metric has eight events.
    
    By default, the constituent events are placed in a group and since the
    events cannot be scheduled at the same time, the metric is not computed.
    The "all metrics" test also fails because of this.
    
    Use the NO_GROUP_EVENTS constraint for such metrics which anyway expect
    the user to run perf with "--metric-no-group".
    
    E.g.
    
      $ sudo perf test -v 101
    
    Before:
    
      101: perf all metrics test                                           :
      --- start ---
      test child forked, pid 37131
      Testing branch_misprediction_ratio
      Testing all_remote_links_outbound
      Testing nps1_die_to_dram
      Metric 'nps1_die_to_dram' not printed in:
      Error:
      Invalid event (dram_channel_data_controller_4) in per-thread mode, enable system wide with '-a'.
      Testing macro_ops_dispatched
      Testing all_l2_cache_accesses
      Testing all_l2_cache_hits
      Testing all_l2_cache_misses
      Testing ic_fetch_miss_ratio
      Testing l2_cache_accesses_from_l2_hwpf
      Testing l2_cache_misses_from_l2_hwpf
      Testing op_cache_fetch_miss_ratio
      Testing l3_read_miss_latency
      Testing l1_itlb_misses
      test child finished with -1
      ---- end ----
      perf all metrics test: FAILED!
    
    After:
    
      101: perf all metrics test                                           :
      --- start ---
      test child forked, pid 43766
      Testing branch_misprediction_ratio
      Testing all_remote_links_outbound
      Testing nps1_die_to_dram
      Testing macro_ops_dispatched
      Testing all_l2_cache_accesses
      Testing all_l2_cache_hits
      Testing all_l2_cache_misses
      Testing ic_fetch_miss_ratio
      Testing l2_cache_accesses_from_l2_hwpf
      Testing l2_cache_misses_from_l2_hwpf
      Testing op_cache_fetch_miss_ratio
      Testing l3_read_miss_latency
      Testing l1_itlb_misses
      test child finished with 0
      ---- end ----
      perf all metrics test: Ok
    Reported-by: default avatarAyush Jain <ayush.jain3@amd.com>
    Suggested-by: default avatarIan Rogers <irogers@google.com>
    Signed-off-by: default avatarSandipan Das <sandipan.das@amd.com>
    Acked-by: default avatarIan Rogers <irogers@google.com>
    Cc: Adrian Hunter <adrian.hunter@intel.com>
    Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
    Cc: Ananth Narayan <ananth.narayan@amd.com>
    Cc: Ingo Molnar <mingo@redhat.com>
    Cc: Jiri Olsa <jolsa@kernel.org>
    Cc: Mark Rutland <mark.rutland@arm.com>
    Cc: Namhyung Kim <namhyung@kernel.org>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Cc: Ravi Bangoria <ravi.bangoria@amd.com>
    Cc: Santosh Shukla <santosh.shukla@amd.com>
    Link: https://lore.kernel.org/r/20230706063440.54189-1-sandipan.das@amd.comSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
    8d40f74e
recommended.json 5.61 KB