linux-kernel - [PATCH v8 20/52] perf jevents: Add hardware prefetch (hwpf) metric group for AMD

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Message-ID: <20251113032040.1994090-21-irogers@google.com>
Date: Wed, 12 Nov 2025 19:20:08 -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 20/52] perf jevents: Add hardware prefetch (hwpf) metric
 group for AMD

Add metrics that give the utility of hardware prefetches on zen2, zen3
and zen4.

Signed-off-by: Ian Rogers <irogers@...gle.com>
---
 tools/perf/pmu-events/amd_metrics.py | 64 ++++++++++++++++++++++++++++
 1 file changed, 64 insertions(+)

diff --git a/tools/perf/pmu-events/amd_metrics.py b/tools/perf/pmu-events/amd_metrics.py
index 06cb56cbd617..be27a4947e45 100755
--- a/tools/perf/pmu-events/amd_metrics.py
+++ b/tools/perf/pmu-events/amd_metrics.py
@@ -121,6 +121,69 @@ def AmdBr():
                        description="breakdown of retired branch instructions")
 
 
+def AmdHwpf():
+    """Returns a MetricGroup representing AMD hardware prefetch metrics."""
+    global _zen_model
+    if _zen_model <= 1:
+        return None
+
+    hwp_ld = Event("ls_dispatch.ld_dispatch")
+    hwp_l2 = Event("ls_hw_pf_dc_fills.local_l2",
+                   "ls_hw_pf_dc_fills.lcl_l2",
+                   "ls_hw_pf_dc_fill.ls_mabresp_lcl_l2")
+    hwp_lc = Event("ls_hw_pf_dc_fills.local_ccx",
+                   "ls_hw_pf_dc_fills.int_cache",
+                   "ls_hw_pf_dc_fill.ls_mabresp_lcl_cache")
+    hwp_lm = Event("ls_hw_pf_dc_fills.dram_io_near",
+                   "ls_hw_pf_dc_fills.mem_io_local",
+                   "ls_hw_pf_dc_fill.ls_mabresp_lcl_dram")
+    hwp_rc = Event("ls_hw_pf_dc_fills.far_cache",
+                   "ls_hw_pf_dc_fills.ext_cache_remote",
+                   "ls_hw_pf_dc_fill.ls_mabresp_rmt_cache")
+    hwp_rm = Event("ls_hw_pf_dc_fills.dram_io_far",
+                   "ls_hw_pf_dc_fills.mem_io_remote",
+                   "ls_hw_pf_dc_fill.ls_mabresp_rmt_dram")
+
+    loc_pf = hwp_l2 + hwp_lc + hwp_lm
+    rem_pf = hwp_rc + hwp_rm
+    all_pf = loc_pf + rem_pf
+
+    r1 = d_ratio(ins, all_pf)
+    r2 = d_ratio(hwp_ld, all_pf)
+    r3 = d_ratio(all_pf, interval_sec)
+
+    overview = MetricGroup("lpm_hwpf_overview", [
+        Metric("lpm_hwpf_ov_insn_bt_hwpf", "Insn between HWPF", r1, "insns"),
+        Metric("lpm_hwpf_ov_loads_bt_hwpf", "Loads between HWPF", r2, "loads"),
+        Metric("lpm_hwpf_ov_rate", "HWPF per second", r3, "hwpf/s"),
+    ])
+    r1 = d_ratio(hwp_l2, all_pf)
+    r2 = d_ratio(hwp_lc, all_pf)
+    r3 = d_ratio(hwp_lm, all_pf)
+    data_src_local = MetricGroup("lpm_hwpf_data_src_local", [
+        Metric("lpm_hwpf_data_src_local_l2",
+               "Data source local l2", r1, "100%"),
+        Metric("lpm_hwpf_data_src_local_ccx_l3_loc_ccx",
+               "Data source local ccx l3 loc ccx", r2, "100%"),
+        Metric("lpm_hwpf_data_src_local_memory_or_io",
+               "Data source local memory or IO", r3, "100%"),
+    ])
+
+    r1 = d_ratio(hwp_rc, all_pf)
+    r2 = d_ratio(hwp_rm, all_pf)
+    data_src_remote = MetricGroup("lpm_hwpf_data_src_remote", [
+        Metric("lpm_hwpf_data_src_remote_cache", "Data source remote cache", r1,
+               "100%"),
+        Metric("lpm_hwpf_data_src_remote_memory_or_io",
+               "Data source remote memory or IO", r2, "100%"),
+    ])
+
+    data_src = MetricGroup("lpm_hwpf_data_src", [
+                           data_src_local, data_src_remote])
+    return MetricGroup("lpm_hwpf", [overview, data_src],
+                       description="Hardware prefetch breakdown (CCX L3 = L3 of current thread, Loc CCX = CCX cache on some socket)")
+
+
 def AmdSwpf() -> Optional[MetricGroup]:
     """Returns a MetricGroup representing AMD software prefetch metrics."""
     global _zen_model
@@ -287,6 +350,7 @@ def main() -> None:
 
     all_metrics = MetricGroup("", [
         AmdBr(),
+        AmdHwpf(),
         AmdSwpf(),
         AmdUpc(),
         Idle(),
-- 
2.51.2.1041.gc1ab5b90ca-goog