linux-kernel - [PATCH v8 35/52] perf jevents: Add software prefetch (swpf) metric group for Intel

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Message-ID: <20251113032040.1994090-36-irogers@google.com>
Date: Wed, 12 Nov 2025 19:20:23 -0800
From: Ian Rogers <irogers@...gle.com>
To: Adrian Hunter <adrian.hunter@...el.com>, 
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>, 
	Arnaldo Carvalho de Melo <acme@...nel.org>, Benjamin Gray <bgray@...ux.ibm.com>, 
	Caleb Biggers <caleb.biggers@...el.com>, Edward Baker <edward.baker@...el.com>, 
	Ian Rogers <irogers@...gle.com>, Ingo Molnar <mingo@...hat.com>, 
	James Clark <james.clark@...aro.org>, Jing Zhang <renyu.zj@...ux.alibaba.com>, 
	Jiri Olsa <jolsa@...nel.org>, John Garry <john.g.garry@...cle.com>, Leo Yan <leo.yan@....com>, 
	Namhyung Kim <namhyung@...nel.org>, Perry Taylor <perry.taylor@...el.com>, 
	Peter Zijlstra <peterz@...radead.org>, Samantha Alt <samantha.alt@...el.com>, 
	Sandipan Das <sandipan.das@....com>, Thomas Falcon <thomas.falcon@...el.com>, 
	Weilin Wang <weilin.wang@...el.com>, Xu Yang <xu.yang_2@....com>, linux-kernel@...r.kernel.org, 
	linux-perf-users@...r.kernel.org
Subject: [PATCH v8 35/52] 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 | 66 ++++++++++++++++++++++++++
 1 file changed, 66 insertions(+)

diff --git a/tools/perf/pmu-events/intel_metrics.py b/tools/perf/pmu-events/intel_metrics.py
index e1944d821248..919a058c343a 100755
--- a/tools/perf/pmu-events/intel_metrics.py
+++ b/tools/perf/pmu-events/intel_metrics.py
@@ -261,6 +261,71 @@ 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
 
@@ -291,6 +356,7 @@ def main() -> None:
         Smi(),
         Tsx(),
         IntelBr(),
+        IntelSwpf(),
     ])
 
     if _args.metricgroups:
-- 
2.51.2.1041.gc1ab5b90ca-goog