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From: Thomas Richter <tmricht@linux.ibm.com>
To: linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org,
        acme@kernel.org, irogers@google.com
Cc: svens@linux.ibm.com, gor@linux.ibm.com, sumanthk@linux.ibm.com,
        hca@linux.ibm.com, Thomas Richter <tmricht@linux.ibm.com>
Subject: [PATCH 2/2 v2] perf stat: do not fail on metrics on s390 zvm systems
Date: Thu, 21 Mar 2024 08:15:12 +0100
Message-Id: <20240321071512.2916952-2-tmricht@linux.ibm.com>
In-Reply-To: <20240321071512.2916952-1-tmricht@linux.ibm.com>
References: <20240321071512.2916952-1-tmricht@linux.ibm.com>
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On s390 z/VM virtual machines command perf list also displays metrics:

 # ./perf list | grep -A 20 'Metric Groups:'
 Metric Groups:

 No_group:
  cpi
       [Cycles per Instruction]
  est_cpi
       [Estimated Instruction Complexity CPI infinite Level 1]
  finite_cpi
       [Cycles per Instructions from Finite cache/memory]
  l1mp
       [Level One Miss per 100 Instructions]
  l2p
       [Percentage sourced from Level 2 cache]
  l3p
       [Percentage sourced from Level 3 on same chip cache]
  l4lp
       [Percentage sourced from Level 4 Local cache on same book]
  l4rp
       [Percentage sourced from Level 4 Remote cache on different book]
  memp
       [Percentage sourced from memory]
  ....
 #

The command

 # ./perf stat -M cpi -- true
 event syntax error: '{CPU_CYCLES/metric-id=CPU_CYCLES/.....'
                       \___ Bad event or PMU

 Unable to find PMU or event on a PMU of 'CPU_CYCLES'

 event syntax error: '{CPU_CYCLES/metric-id=CPU_CYCLES/...'
                       \___ Cannot find PMU `CPU_CYCLES'.
			    Missing kernel support?
 #

fails. Perf stat should not fail on metrics when the referenced
CPU Counter Measurement PMU is not available.

Output after:
 # ./perf stat -M est_cpi -- sleep 1

 Performance counter stats for 'sleep 1':

     1,000,887,494 ns   duration_time   #     0.00 est_cpi

       1.000887494 seconds time elapsed

       0.000143000 seconds user
       0.000662000 seconds sys

 #

Fixes: 7f76b3113068 ("perf list: Add IBM z16 event description for s390")
Signed-off-by: Thomas Richter <tmricht@linux.ibm.com>
Suggested-by: Ian Rogers <irogers@google.com>
---
 .../arch/s390/cf_z16/transaction.json         | 28 +++++++++----------
 1 file changed, 14 insertions(+), 14 deletions(-)

diff --git a/tools/perf/pmu-events/arch/s390/cf_z16/transaction.json b/tools/perf/pmu-events/arch/s390/cf_z16/transaction.json
index ec2ff78e2b5f..3ab1d3a6638c 100644
--- a/tools/perf/pmu-events/arch/s390/cf_z16/transaction.json
+++ b/tools/perf/pmu-events/arch/s390/cf_z16/transaction.json
@@ -2,71 +2,71 @@
   {
     "BriefDescription": "Transaction count",
     "MetricName": "transaction",
-    "MetricExpr": "TX_C_TEND + TX_NC_TEND + TX_NC_TABORT + TX_C_TABORT_SPECIAL + TX_C_TABORT_NO_SPECIAL"
+    "MetricExpr": "TX_C_TEND + TX_NC_TEND + TX_NC_TABORT + TX_C_TABORT_SPECIAL + TX_C_TABORT_NO_SPECIAL if has_event(TX_C_TEND) else 0"
   },
   {
     "BriefDescription": "Cycles per Instruction",
     "MetricName": "cpi",
-    "MetricExpr": "CPU_CYCLES / INSTRUCTIONS"
+    "MetricExpr": "CPU_CYCLES / INSTRUCTIONS if has_event(INSTRUCTIONS) else 0"
   },
   {
     "BriefDescription": "Problem State Instruction Ratio",
     "MetricName": "prbstate",
-    "MetricExpr": "(PROBLEM_STATE_INSTRUCTIONS / INSTRUCTIONS) * 100"
+    "MetricExpr": "(PROBLEM_STATE_INSTRUCTIONS / INSTRUCTIONS) * 100 if has_event(INSTRUCTIONS) else 0"
   },
   {
     "BriefDescription": "Level One Miss per 100 Instructions",
     "MetricName": "l1mp",
-    "MetricExpr": "((L1I_DIR_WRITES + L1D_DIR_WRITES) / INSTRUCTIONS) * 100"
+    "MetricExpr": "((L1I_DIR_WRITES + L1D_DIR_WRITES) / INSTRUCTIONS) * 100 if has_event(INSTRUCTIONS) else 0"
   },
   {
     "BriefDescription": "Percentage sourced from Level 2 cache",
     "MetricName": "l2p",
-    "MetricExpr": "((DCW_REQ + DCW_REQ_IV + ICW_REQ + ICW_REQ_IV) / (L1I_DIR_WRITES + L1D_DIR_WRITES)) * 100"
+    "MetricExpr": "((DCW_REQ + DCW_REQ_IV + ICW_REQ + ICW_REQ_IV) / (L1I_DIR_WRITES + L1D_DIR_WRITES)) * 100 if has_event(DCW_REQ) else 0"
   },
   {
     "BriefDescription": "Percentage sourced from Level 3 on same chip cache",
     "MetricName": "l3p",
-    "MetricExpr": "((DCW_REQ_CHIP_HIT + DCW_ON_CHIP + DCW_ON_CHIP_IV + DCW_ON_CHIP_CHIP_HIT + ICW_REQ_CHIP_HIT + ICW_ON_CHIP + ICW_ON_CHIP_IV + ICW_ON_CHIP_CHIP_HIT) / (L1I_DIR_WRITES + L1D_DIR_WRITES)) * 100"
+    "MetricExpr": "((DCW_REQ_CHIP_HIT + DCW_ON_CHIP + DCW_ON_CHIP_IV + DCW_ON_CHIP_CHIP_HIT + ICW_REQ_CHIP_HIT + ICW_ON_CHIP + ICW_ON_CHIP_IV + ICW_ON_CHIP_CHIP_HIT) / (L1I_DIR_WRITES + L1D_DIR_WRITES)) * 100 if has_event(DCW_REQ_CHIP_HIT) else 0"
   },
   {
     "BriefDescription": "Percentage sourced from Level 4 Local cache on same book",
     "MetricName": "l4lp",
-    "MetricExpr": "((DCW_REQ_DRAWER_HIT + DCW_ON_CHIP_DRAWER_HIT + DCW_ON_MODULE + DCW_ON_DRAWER + IDCW_ON_MODULE_IV + IDCW_ON_MODULE_CHIP_HIT + IDCW_ON_MODULE_DRAWER_HIT + IDCW_ON_DRAWER_IV + IDCW_ON_DRAWER_CHIP_HIT + IDCW_ON_DRAWER_DRAWER_HIT + ICW_REQ_DRAWER_HIT + ICW_ON_CHIP_DRAWER_HIT + ICW_ON_MODULE + ICW_ON_DRAWER) / (L1I_DIR_WRITES + L1D_DIR_WRITES)) * 100"
+    "MetricExpr": "((DCW_REQ_DRAWER_HIT + DCW_ON_CHIP_DRAWER_HIT + DCW_ON_MODULE + DCW_ON_DRAWER + IDCW_ON_MODULE_IV + IDCW_ON_MODULE_CHIP_HIT + IDCW_ON_MODULE_DRAWER_HIT + IDCW_ON_DRAWER_IV + IDCW_ON_DRAWER_CHIP_HIT + IDCW_ON_DRAWER_DRAWER_HIT + ICW_REQ_DRAWER_HIT + ICW_ON_CHIP_DRAWER_HIT + ICW_ON_MODULE + ICW_ON_DRAWER) / (L1I_DIR_WRITES + L1D_DIR_WRITES)) * 100 if has_event(DCW_REQ_DRAWER_HIT) else 0"
   },
   {
     "BriefDescription": "Percentage sourced from Level 4 Remote cache on different book",
     "MetricName": "l4rp",
-    "MetricExpr": "((DCW_OFF_DRAWER + IDCW_OFF_DRAWER_IV + IDCW_OFF_DRAWER_CHIP_HIT + IDCW_OFF_DRAWER_DRAWER_HIT + ICW_OFF_DRAWER) / (L1I_DIR_WRITES + L1D_DIR_WRITES)) * 100"
+    "MetricExpr": "((DCW_OFF_DRAWER + IDCW_OFF_DRAWER_IV + IDCW_OFF_DRAWER_CHIP_HIT + IDCW_OFF_DRAWER_DRAWER_HIT + ICW_OFF_DRAWER) / (L1I_DIR_WRITES + L1D_DIR_WRITES)) * 100 if has_event(DCW_OFF_DRAWER) else 0"
   },
   {
     "BriefDescription": "Percentage sourced from memory",
     "MetricName": "memp",
-    "MetricExpr": "((DCW_ON_CHIP_MEMORY + DCW_ON_MODULE_MEMORY + DCW_ON_DRAWER_MEMORY + DCW_OFF_DRAWER_MEMORY + ICW_ON_CHIP_MEMORY + ICW_ON_MODULE_MEMORY + ICW_ON_DRAWER_MEMORY + ICW_OFF_DRAWER_MEMORY) / (L1I_DIR_WRITES + L1D_DIR_WRITES)) * 100"
+    "MetricExpr": "((DCW_ON_CHIP_MEMORY + DCW_ON_MODULE_MEMORY + DCW_ON_DRAWER_MEMORY + DCW_OFF_DRAWER_MEMORY + ICW_ON_CHIP_MEMORY + ICW_ON_MODULE_MEMORY + ICW_ON_DRAWER_MEMORY + ICW_OFF_DRAWER_MEMORY) / (L1I_DIR_WRITES + L1D_DIR_WRITES)) * 100 if has_event(DCW_ON_CHIP_MEMORY) else 0"
   },
   {
     "BriefDescription": "Cycles per Instructions from Finite cache/memory",
     "MetricName": "finite_cpi",
-    "MetricExpr": "L1C_TLB2_MISSES / INSTRUCTIONS"
+    "MetricExpr": "L1C_TLB2_MISSES / INSTRUCTIONS if has_event(L1C_TLB2_MISSES) else 0"
   },
   {
     "BriefDescription": "Estimated Instruction Complexity CPI infinite Level 1",
     "MetricName": "est_cpi",
-    "MetricExpr": "(CPU_CYCLES / INSTRUCTIONS) - (L1C_TLB2_MISSES / INSTRUCTIONS)"
+    "MetricExpr": "(CPU_CYCLES / INSTRUCTIONS) - (L1C_TLB2_MISSES / INSTRUCTIONS) if has_event(INSTRUCTIONS) else 0"
   },
   {
     "BriefDescription": "Estimated Sourcing Cycles per Level 1 Miss",
     "MetricName": "scpl1m",
-    "MetricExpr": "L1C_TLB2_MISSES / (L1I_DIR_WRITES + L1D_DIR_WRITES)"
+    "MetricExpr": "L1C_TLB2_MISSES / (L1I_DIR_WRITES + L1D_DIR_WRITES) if has_event(L1C_TLB2_MISSES) else 0"
   },
   {
     "BriefDescription": "Estimated TLB CPU percentage of Total CPU",
     "MetricName": "tlb_percent",
-    "MetricExpr": "((DTLB2_MISSES + ITLB2_MISSES) / CPU_CYCLES) * (L1C_TLB2_MISSES / (L1I_PENALTY_CYCLES + L1D_PENALTY_CYCLES)) * 100"
+    "MetricExpr": "((DTLB2_MISSES + ITLB2_MISSES) / CPU_CYCLES) * (L1C_TLB2_MISSES / (L1I_PENALTY_CYCLES + L1D_PENALTY_CYCLES)) * 100 if has_event(CPU_CYCLES) else 0"
   },
   {
     "BriefDescription": "Estimated Cycles per TLB Miss",
     "MetricName": "tlb_miss",
-    "MetricExpr": "((DTLB2_MISSES + ITLB2_MISSES) / (DTLB2_WRITES + ITLB2_WRITES)) * (L1C_TLB2_MISSES / (L1I_PENALTY_CYCLES + L1D_PENALTY_CYCLES))"
+    "MetricExpr": "((DTLB2_MISSES + ITLB2_MISSES) / (DTLB2_WRITES + ITLB2_WRITES)) * (L1C_TLB2_MISSES / (L1I_PENALTY_CYCLES + L1D_PENALTY_CYCLES)) if has_event(DTLB2_MISSES) else 0"
   }
 ]
-- 
2.44.0