6.6-stable review patch. If anyone has any objections, please let me know.
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From: Kajol Jain kjain@linux.ibm.com
[ Upstream commit 3f8b6e5b11192dacb721d2d28ea4589917f5e822 ]
The CPI_STALL_RATIO metric group can be used to present the high level CPI stall breakdown metrics in powerpc, which will show:
- DISPATCH_STALL_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 ( Completion stall cycles per insn )
Commit cf26e043c2a9 ("perf vendor events power10: Add JSON metric events to present CPI stall cycles in powerpc)" which added the CPI_STALL_RATIO metric group, also modified the PMC value used in PM_RUN_INST_CMPL event from PMC4 to PMC5, to avoid multiplexing of events. But that got revert in recent changes. Fix this issue by changing back the PMC value used in PM_RUN_INST_CMPL to PMC5.
Result with the fix:
./perf stat --metric-no-group -M CPI_STALL_RATIO <workload>
Performance counter stats for 'workload':
68,745,426 PM_CMPL_STALL # 0.21 COMPLETION_STALL_CPI 7,692,827 PM_ISSUE_STALL # 0.02 ISSUE_STALL_CPI 322,638,223 PM_RUN_INST_CMPL # 0.05 DISPATCH_STALL_CPI # 0.48 EXECUTION_STALL_CPI 16,858,553 PM_DISP_STALL_CYC 153,880,133 PM_EXEC_STALL
0.089774592 seconds time elapsed
"--metric-no-group" is used for forcing PM_RUN_INST_CMPL to be scheduled in all group for more accuracy.
Fixes: 7d473f475b2a ("perf vendor events: Move JSON/events to appropriate files for power10 platform") Reported-by: Disha Goel disgoel@linux.vnet.ibm.com Signed-off-by: Kajol Jain kjain@linux.ibm.com Reviewed-by: Athira Rajeev atrajeev@linux.vnet.ibm.com Tested-by: Disha Goeldisgoel@linux.ibm.com Cc: maddy@linux.ibm.com Link: https://lore.kernel.org/r/20231016143110.244255-1-kjain@linux.ibm.com Signed-off-by: Namhyung Kim namhyung@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- tools/perf/pmu-events/arch/powerpc/power10/pmc.json | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/tools/perf/pmu-events/arch/powerpc/power10/pmc.json b/tools/perf/pmu-events/arch/powerpc/power10/pmc.json index c606ae03cd27d..0e0253d0e7577 100644 --- a/tools/perf/pmu-events/arch/powerpc/power10/pmc.json +++ b/tools/perf/pmu-events/arch/powerpc/power10/pmc.json @@ -195,7 +195,7 @@ "BriefDescription": "Threshold counter exceeded a value of 128." }, { - "EventCode": "0x400FA", + "EventCode": "0x500FA", "EventName": "PM_RUN_INST_CMPL", "BriefDescription": "PowerPC instruction completed while the run latch is set." }