perf vendor events power10: Add JSON metric events to present CPI stall cycles in...

Power10 Performance Monitoring Unit (PMU) provides events to understand
stall cycles of different pipeline stages.  These events along with
completed instructions provides useful metrics for application tuning.

Patch implements the JSON changes to collect counter statistics to
present the high level CPI stall breakdown metrics. New metric group is
named as "CPI_STALL_RATIO" and this new metric group presents these
stall metrics:

- DISPATCHED_CPI ( Dispatch stall cycles per insn )
- ISSUE_STALL_CPI ( Issue stall cycles per insn )
- EXECUTION_STALL_CPI ( Execution stall cycles per insn )
- COMPLETION_STALL_CPI ( Completition stall cycles per insn )

To avoid multipling of events, PM_RUN_INST_CMPL event has been modified
to use PMC5(performance monitoring counter5) instead of PMC4. This
change is needed, since completion stall event is using PMC4.

Usage example:

 ./perf stat --metric-no-group -M CPI_STALL_RATIO <workload>

 Performance counter stats for 'workload':

    63,056,817,982      PM_CMPL_STALL                    #     0.28 COMPLETION_STALL_CPI
 1,743,988,038,896      PM_ISSUE_STALL                   #     7.73 ISSUE_STALL_CPI
   225,597,495,030      PM_RUN_INST_CMPL                 #     6.18 DISPATCHED_CPI
                                                  #    37.48 EXECUTION_STALL_CPI
 1,393,916,546,654      PM_DISP_STALL_CYC
 8,455,376,836,463      PM_EXEC_STALL

"--metric-no-group" is used for forcing PM_RUN_INST_CMPL to be scheduled
in all group for more accuracy.

Signed-off-by: Athira Rajeev <atrajeev@linux.vnet.ibm.com>
Acked-by: Ian Rogers <irogers@google.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Disha Goel <disgoel@linux.ibm.com>
Cc: James Clark <james.clark@arm.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kajol Jain <kjain@linux.ibm.com>
Cc: Madhavan Srinivasan <maddy@linux.vnet.ibm.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Nageswara R Sastry <rnsastry@linux.ibm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: linuxppc-dev@lists.ozlabs.org
Link: https://lore.kernel.org/r/20230216061240.18067-1-atrajeev@linux.vnet.ibm.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/pmu-events/arch/powerpc/power10/metrics.json b/tools/perf/pmu-events/arch/powerpc/power10/metrics.json
index b57526fa44f2df6c61f2bde128b4d0d565feb374..6f53583a0c62c2b34de663e2843d04c1bafaedba 100644 (file)
--- a/tools/perf/pmu-events/arch/powerpc/power10/metrics.json
+++ b/tools/perf/pmu-events/arch/powerpc/power10/metrics.json
@@ -15,7 +15,7 @@
     {
         "BriefDescription": "Average cycles per completed instruction when dispatch was stalled for any reason",
         "MetricExpr": "PM_DISP_STALL_CYC / PM_RUN_INST_CMPL",
-        "MetricGroup": "CPI",
+        "MetricGroup": "CPI;CPI_STALL_RATIO",
         "MetricName": "DISPATCHED_CPI"
     },
     {
@@ -147,13 +147,13 @@
     {
         "BriefDescription": "Average cycles per completed instruction when the NTC instruction has been dispatched but not issued for any reason",
         "MetricExpr": "PM_ISSUE_STALL / PM_RUN_INST_CMPL",
-        "MetricGroup": "CPI",
+        "MetricGroup": "CPI;CPI_STALL_RATIO",
         "MetricName": "ISSUE_STALL_CPI"
     },
     {
         "BriefDescription": "Average cycles per completed instruction when the NTC instruction is waiting to be finished in one of the execution units",
         "MetricExpr": "PM_EXEC_STALL / PM_RUN_INST_CMPL",
-        "MetricGroup": "CPI",
+        "MetricGroup": "CPI;CPI_STALL_RATIO",
         "MetricName": "EXECUTION_STALL_CPI"
     },
     {
@@ -309,7 +309,7 @@
     {
         "BriefDescription": "Average cycles per completed instruction when the NTC instruction cannot complete because the thread was blocked",
         "MetricExpr": "PM_CMPL_STALL / PM_RUN_INST_CMPL",
-        "MetricGroup": "CPI",
+        "MetricGroup": "CPI;CPI_STALL_RATIO",
         "MetricName": "COMPLETION_STALL_CPI"
     },
     {

diff --git a/tools/perf/pmu-events/arch/powerpc/power10/others.json b/tools/perf/pmu-events/arch/powerpc/power10/others.json
index 7d0de1a2860b49cf4c58b37c901210076fd47c9a..a771e4b6bec5845282fc3290d1c428fbad281954 100644 (file)
--- a/tools/perf/pmu-events/arch/powerpc/power10/others.json
+++ b/tools/perf/pmu-events/arch/powerpc/power10/others.json
@@ -265,7 +265,7 @@
     "BriefDescription": "Load Missed L1, counted at finish time."
   },
   {
-    "EventCode": "0x400FA",
+    "EventCode": "0x500FA",
     "EventName": "PM_RUN_INST_CMPL",
     "BriefDescription": "Completed PowerPC instructions gated by the run latch."
   }