linux-kernel - [PATCH v1 10/13] perf jevents: Add load store breakdown metrics ldst for AMD

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Message-Id: <20240229001537.4158049-11-irogers@google.com>
Date: Wed, 28 Feb 2024 16:15:34 -0800
From: Ian Rogers <irogers@...gle.com>
To: Sandipan Das <sandipan.das@....com>, Ravi Bangoria <ravi.bangoria@....com>, 
	Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>, 
	Arnaldo Carvalho de Melo <acme@...nel.org>, Namhyung Kim <namhyung@...nel.org>, 
	Mark Rutland <mark.rutland@....com>, 
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>, Jiri Olsa <jolsa@...nel.org>, 
	Ian Rogers <irogers@...gle.com>, Adrian Hunter <adrian.hunter@...el.com>, 
	John Garry <john.g.garry@...cle.com>, Kan Liang <kan.liang@...ux.intel.com>, 
	Jing Zhang <renyu.zj@...ux.alibaba.com>, Thomas Richter <tmricht@...ux.ibm.com>, 
	James Clark <james.clark@....com>, linux-kernel@...r.kernel.org, 
	linux-perf-users@...r.kernel.org, Stephane Eranian <eranian@...gle.com>
Subject: [PATCH v1 10/13] perf jevents: Add load store breakdown metrics ldst
 for AMD

Give breakdown of number of instructions. Use the counter mask (cmask)
to show the number of cycles taken to retire the instructions.

Signed-off-by: Ian Rogers <irogers@...gle.com>
---
 tools/perf/pmu-events/amd_metrics.py | 75 ++++++++++++++++++++++++++++
 1 file changed, 75 insertions(+)

diff --git a/tools/perf/pmu-events/amd_metrics.py b/tools/perf/pmu-events/amd_metrics.py
index f4a4ece551ef..6b182a9bbfe5 100755
--- a/tools/perf/pmu-events/amd_metrics.py
+++ b/tools/perf/pmu-events/amd_metrics.py
@@ -278,6 +278,80 @@ def AmdItlb():
   ], description="Instruction TLB breakdown")
 
 
+def AmdLdSt() -> MetricGroup:
+  ldst_ld = Event("ls_dispatch.ld_dispatch")
+  ldst_st = Event("ls_dispatch.store_dispatch")
+  ldst_ldc1 = Event(f"{ldst_ld}/cmask=1/")
+  ldst_stc1 = Event(f"{ldst_st}/cmask=1/")
+  ldst_ldc2 = Event(f"{ldst_ld}/cmask=2/")
+  ldst_stc2 = Event(f"{ldst_st}/cmask=2/")
+  ldst_ldc3 = Event(f"{ldst_ld}/cmask=3/")
+  ldst_stc3 = Event(f"{ldst_st}/cmask=3/")
+  ldst_cyc = Event("ls_not_halted_cyc")
+
+  ld_rate = d_ratio(ldst_ld, interval_sec)
+  st_rate = d_ratio(ldst_st, interval_sec)
+
+  ld_v1 = max(ldst_ldc1 - ldst_ldc2, 0)
+  ld_v2 = max(ldst_ldc2 - ldst_ldc3, 0)
+  ld_v3 = ldst_ldc3
+
+  st_v1 = max(ldst_stc1 - ldst_stc2, 0)
+  st_v2 = max(ldst_stc2 - ldst_stc3, 0)
+  st_v3 = ldst_stc3
+
+  return MetricGroup("ldst", [
+      MetricGroup("ldst_total", [
+          Metric("ldst_total_ld", "Number of loads dispatched per second.",
+                 ld_rate, "insns/sec"),
+          Metric("ldst_total_st", "Number of stores dispatched per second.",
+                 st_rate, "insns/sec"),
+      ]),
+      MetricGroup("ldst_percent_insn", [
+          Metric("ldst_percent_insn_ld",
+                 "Load instructions as a percentage of all instructions.",
+                 d_ratio(ldst_ld, ins), "100%"),
+          Metric("ldst_percent_insn_st",
+                 "Store instructions as a percentage of all instructions.",
+                 d_ratio(ldst_st, ins), "100%"),
+      ]),
+      MetricGroup("ldst_ret_loads_per_cycle", [
+          Metric(
+              "ldst_ret_loads_per_cycle_1",
+              "Load instructions retiring in 1 cycle as a percentage of all "
+              "unhalted cycles.", d_ratio(ld_v1, ldst_cyc), "100%"),
+          Metric(
+              "ldst_ret_loads_per_cycle_2",
+              "Load instructions retiring in 2 cycles as a percentage of all "
+              "unhalted cycles.", d_ratio(ld_v2, ldst_cyc), "100%"),
+          Metric(
+              "ldst_ret_loads_per_cycle_3",
+              "Load instructions retiring in 3 or more cycles as a percentage"
+              "of all unhalted cycles.", d_ratio(ld_v3, ldst_cyc), "100%"),
+      ]),
+      MetricGroup("ldst_ret_stores_per_cycle", [
+          Metric(
+              "ldst_ret_stores_per_cycle_1",
+              "Store instructions retiring in 1 cycle as a percentage of all "
+              "unhalted cycles.", d_ratio(st_v1, ldst_cyc), "100%"),
+          Metric(
+              "ldst_ret_stores_per_cycle_2",
+              "Store instructions retiring in 2 cycles as a percentage of all "
+              "unhalted cycles.", d_ratio(st_v2, ldst_cyc), "100%"),
+          Metric(
+              "ldst_ret_stores_per_cycle_3",
+              "Store instructions retiring in 3 or more cycles as a percentage"
+              "of all unhalted cycles.", d_ratio(st_v3, ldst_cyc), "100%"),
+      ]),
+      MetricGroup("ldst_insn_bt", [
+          Metric("ldst_insn_bt_ld", "Number of instructions between loads.",
+                 d_ratio(ins, ldst_ld), "insns"),
+          Metric("ldst_insn_bt_st", "Number of instructions between stores.",
+                 d_ratio(ins, ldst_st), "insns"),
+      ])
+  ], description="Breakdown of load/store instructions")
+
+
 def AmdHwpf():
   """Returns a MetricGroup representing AMD hardware prefetch metrics."""
   if zen_model <= 1:
@@ -488,6 +562,7 @@ all_metrics = MetricGroup("", [
     AmdBr(),
     AmdDtlb(),
     AmdItlb(),
+    AmdLdSt(),
     AmdHwpf(),
     AmdSwpf(),
     AmdUpc(),
-- 
2.44.0.278.ge034bb2e1d-goog