linux-kernel - [PATCH v5 08/22] perf jevents: Add software prefetch (swpf) metric group for Intel

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Message-ID: <20250829041104.4186320-9-irogers@google.com>
Date: Thu, 28 Aug 2025 21:10:49 -0700
From: Ian Rogers <irogers@...gle.com>
To: 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>, 
	Kan Liang <kan.liang@...ux.intel.com>, James Clark <james.clark@...aro.org>, 
	Xu Yang <xu.yang_2@....com>, linux-kernel@...r.kernel.org, 
	linux-perf-users@...r.kernel.org, John Garry <john.g.garry@...cle.com>, 
	Jing Zhang <renyu.zj@...ux.alibaba.com>, Sandipan Das <sandipan.das@....com>, 
	Benjamin Gray <bgray@...ux.ibm.com>, Perry Taylor <perry.taylor@...el.com>, 
	Samantha Alt <samantha.alt@...el.com>, Caleb Biggers <caleb.biggers@...el.com>, 
	Weilin Wang <weilin.wang@...el.com>, Edward Baker <edward.baker@...el.com>, 
	Thomas Falcon <thomas.falcon@...el.com>
Subject: [PATCH v5 08/22] perf jevents: Add software prefetch (swpf) metric
 group for Intel

Add metrics that breakdown software prefetch instruction use.

Signed-off-by: Ian Rogers <irogers@...gle.com>
---
 tools/perf/pmu-events/intel_metrics.py | 65 ++++++++++++++++++++++++++
 1 file changed, 65 insertions(+)

diff --git a/tools/perf/pmu-events/intel_metrics.py b/tools/perf/pmu-events/intel_metrics.py
index 53b9606ef1a2..cfeafb58e8b4 100755
--- a/tools/perf/pmu-events/intel_metrics.py
+++ b/tools/perf/pmu-events/intel_metrics.py
@@ -261,6 +261,70 @@ def IntelBr():
                      description="breakdown of retired branch instructions")
 
 
+def IntelSwpf() -> Optional[MetricGroup]:
+  ins = Event("instructions")
+  try:
+    s_ld = Event("MEM_INST_RETIRED.ALL_LOADS", "MEM_UOPS_RETIRED.ALL_LOADS")
+    s_nta = Event("SW_PREFETCH_ACCESS.NTA")
+    s_t0 = Event("SW_PREFETCH_ACCESS.T0")
+    s_t1 = Event("SW_PREFETCH_ACCESS.T1_T2")
+    s_w = Event("SW_PREFETCH_ACCESS.PREFETCHW")
+  except:
+    return None
+
+  all_sw = s_nta + s_t0 + s_t1 + s_w
+  swp_r = d_ratio(all_sw, interval_sec)
+  ins_r = d_ratio(ins, all_sw)
+  ld_r = d_ratio(s_ld, all_sw)
+
+  return MetricGroup("lpm_swpf", [
+      MetricGroup("lpm_swpf_totals", [
+          Metric("lpm_swpf_totals_exec", "Software prefetch instructions per second",
+                swp_r, "swpf/s"),
+          Metric("lpm_swpf_totals_insn_per_pf",
+                 "Average number of instructions between software prefetches",
+                 ins_r, "insn/swpf"),
+          Metric("lpm_swpf_totals_loads_per_pf",
+                 "Average number of loads between software prefetches",
+                 ld_r, "loads/swpf"),
+      ]),
+      MetricGroup("lpm_swpf_bkdwn", [
+          MetricGroup("lpm_swpf_bkdwn_nta", [
+              Metric("lpm_swpf_bkdwn_nta_per_swpf",
+                     "Software prefetch NTA instructions as a percent of all prefetch instructions",
+                     d_ratio(s_nta, all_sw), "100%"),
+              Metric("lpm_swpf_bkdwn_nta_rate",
+                     "Software prefetch NTA instructions per second",
+                     d_ratio(s_nta, interval_sec), "insn/s"),
+          ]),
+          MetricGroup("lpm_swpf_bkdwn_t0", [
+              Metric("lpm_swpf_bkdwn_t0_per_swpf",
+                     "Software prefetch T0 instructions as a percent of all prefetch instructions",
+                     d_ratio(s_t0, all_sw), "100%"),
+              Metric("lpm_swpf_bkdwn_t0_rate",
+                     "Software prefetch T0 instructions per second",
+                     d_ratio(s_t0, interval_sec), "insn/s"),
+          ]),
+          MetricGroup("lpm_swpf_bkdwn_t1_t2", [
+              Metric("lpm_swpf_bkdwn_t1_t2_per_swpf",
+                     "Software prefetch T1 or T2 instructions as a percent of all prefetch instructions",
+                     d_ratio(s_t1, all_sw), "100%"),
+              Metric("lpm_swpf_bkdwn_t1_t2_rate",
+                     "Software prefetch T1 or T2 instructions per second",
+                     d_ratio(s_t1, interval_sec), "insn/s"),
+          ]),
+          MetricGroup("lpm_swpf_bkdwn_w", [
+              Metric("lpm_swpf_bkdwn_w_per_swpf",
+                     "Software prefetch W instructions as a percent of all prefetch instructions",
+                     d_ratio(s_w, all_sw), "100%"),
+              Metric("lpm_swpf_bkdwn_w_rate",
+                     "Software prefetch W instructions per second",
+                     d_ratio(s_w, interval_sec), "insn/s"),
+          ]),
+      ]),
+  ], description="Software prefetch instruction breakdown")
+
+
 def main() -> None:
   global _args
 
@@ -289,6 +353,7 @@ def main() -> None:
       Smi(),
       Tsx(),
       IntelBr(),
+      IntelSwpf(),
   ])
 
 
-- 
2.51.0.318.gd7df087d1a-goog