This is a note to let you know that I've just added the patch titled
perf vendor events: Update PMC used in PM_RUN_INST_CMPL event for power10 platform
to the 6.6-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
perf-vendor-events-update-pmc-used-in-pm_run_inst_cm.patch
and it can be found in the queue-6.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 5d2029e3db96d9a585b6ddd25f1a7f8f9001c6e9
Author: Kajol Jain <kjain@xxxxxxxxxxxxx>
Date: Mon Oct 16 20:01:10 2023 +0530
perf vendor events: Update PMC used in PM_RUN_INST_CMPL event for power10 platform
[ 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@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Kajol Jain <kjain@xxxxxxxxxxxxx>
Reviewed-by: Athira Rajeev <atrajeev@xxxxxxxxxxxxxxxxxx>
Tested-by: Disha Goel<disgoel@xxxxxxxxxxxxx>
Cc: maddy@xxxxxxxxxxxxx
Link: https://lore.kernel.org/r/20231016143110.244255-1-kjain@xxxxxxxxxxxxx
Signed-off-by: Namhyung Kim <namhyung@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
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."
}
