linux-kernel - [PATCH v4 06/12] perf jevents: Add hardware prefetch (hwpf) metric group for AMD

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Message-Id: <20240926174101.406874-7-irogers@google.com>
Date: Thu, 26 Sep 2024 10:40:55 -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>, 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>, Xu Yang <xu.yang_2@....com>, linux-kernel@...r.kernel.org, 
	linux-perf-users@...r.kernel.org
Subject: [PATCH v4 06/12] 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 | 62 ++++++++++++++++++++++++++++
 1 file changed, 62 insertions(+)

diff --git a/tools/perf/pmu-events/amd_metrics.py b/tools/perf/pmu-events/amd_metrics.py
index 05a16e748d2e..2d1fc8411d61 100755
--- a/tools/perf/pmu-events/amd_metrics.py
+++ b/tools/perf/pmu-events/amd_metrics.py
@@ -120,6 +120,67 @@ 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("hwpf_overview", [
+      Metric("hwpf_ov_insn_bt_hwpf", "Insn between HWPF", r1, "insns"),
+      Metric("hwpf_ov_loads_bt_hwpf", "Loads between HWPF", r2, "loads"),
+      Metric("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("hwpf_data_src_local", [
+      Metric("hwpf_data_src_local_l2", "Data source local l2", r1, "100%"),
+      Metric("hwpf_data_src_local_ccx_l3_loc_ccx",
+             "Data source local ccx l3 loc ccx", r2, "100%"),
+      Metric("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("hwpf_data_src_remote", [
+      Metric("hwpf_data_src_remote_cache", "Data source remote cache", r1,
+             "100%"),
+      Metric("hwpf_data_src_remote_memory_or_io",
+             "Data source remote memory or IO", r2, "100%"),
+  ])
+
+  data_src = MetricGroup("hwpf_data_src", [data_src_local, data_src_remote])
+  return MetricGroup("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
@@ -278,6 +339,7 @@ def main() -> None:
 
   all_metrics = MetricGroup("", [
       AmdBr(),
+      AmdHwpf(),
       AmdSwpf(),
       AmdUpc(),
       Idle(),
-- 
2.46.1.824.gd892dcdcdd-goog