linux-kernel - [PATCH v4 18/22] perf jevents: Add dir breakdown metrics for Intel

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Message-Id: <20240926175035.408668-19-irogers@google.com>
Date: Thu, 26 Sep 2024 10:50:31 -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>, linux-perf-users@...r.kernel.org, 
	linux-kernel@...r.kernel.org, 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>
Subject: [PATCH v4 18/22] perf jevents: Add dir breakdown metrics for Intel

Breakdown directory hit, misses and requests. The implementation uses
the M2M and CHA PMUs present in server models broadwellde, broadwellx
cascadelakex, emeraldrapids, icelakex, sapphirerapids and skylakex.

Signed-off-by: Ian Rogers <irogers@...gle.com>
---
 tools/perf/pmu-events/intel_metrics.py | 36 ++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)

diff --git a/tools/perf/pmu-events/intel_metrics.py b/tools/perf/pmu-events/intel_metrics.py
index 62d504036ba0..77ac048c5451 100755
--- a/tools/perf/pmu-events/intel_metrics.py
+++ b/tools/perf/pmu-events/intel_metrics.py
@@ -781,6 +781,41 @@ def IntelLdSt() -> Optional[MetricGroup]:
   ], description = "Breakdown of load/store instructions")
 
 
+def UncoreDir() -> Optional[MetricGroup]:
+  try:
+    m2m_upd = Event("UNC_M2M_DIRECTORY_UPDATE.ANY")
+    m2m_hits = Event("UNC_M2M_DIRECTORY_HIT.DIRTY_I")
+    # Turn the umask into a ANY rather than DIRTY_I filter.
+    m2m_hits.name += "/umask=0xFF,name=UNC_M2M_DIRECTORY_HIT.ANY/"
+    m2m_miss = Event("UNC_M2M_DIRECTORY_MISS.DIRTY_I")
+    # Turn the umask into a ANY rather than DIRTY_I filter.
+    m2m_miss.name += "/umask=0xFF,name=UNC_M2M_DIRECTORY_MISS.ANY/"
+    cha_upd = Event("UNC_CHA_DIR_UPDATE.HA")
+    # Turn the umask into a ANY rather than HA filter.
+    cha_upd.name += "/umask=3,name=UNC_CHA_DIR_UPDATE.ANY/"
+  except:
+    return None
+
+  m2m_total = m2m_hits + m2m_miss
+  upd = m2m_upd + cha_upd # in cache lines
+  upd_r = upd / interval_sec
+  look_r = m2m_total / interval_sec
+
+  scale = 64 / 1_000_000 # Cache lines to MB
+  return MetricGroup("dir", [
+      Metric("dir_lookup_rate", "",
+             d_ratio(m2m_total, interval_sec), "requests/s"),
+      Metric("dir_lookup_hits", "",
+             d_ratio(m2m_hits, m2m_total), "100%"),
+      Metric("dir_lookup_misses", "",
+             d_ratio(m2m_miss, m2m_total), "100%"),
+      Metric("dir_update_requests", "",
+             d_ratio(m2m_upd + cha_upd, interval_sec), "requests/s"),
+      Metric("dir_update_bw", "",
+             d_ratio(m2m_upd + cha_upd, interval_sec), f"{scale}MB/s"),
+  ])
+
+
 def UncoreMem() -> Optional[MetricGroup]:
   try:
     loc_rds = Event("UNC_CHA_REQUESTS.READS_LOCAL", "UNC_H_REQUESTS.READS_LOCAL")
@@ -904,6 +939,7 @@ def main() -> None:
       IntelMlp(),
       IntelPorts(),
       IntelSwpf(),
+      UncoreDir(),
       UncoreMem(),
       UncoreMemBw(),
   ])
-- 
2.46.1.824.gd892dcdcdd-goog