linux-kernel - [PATCH v8 45/52] perf jevents: Add dir breakdown metrics for Intel

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20251113032040.1994090-46-irogers@google.com>
Date: Wed, 12 Nov 2025 19:20:33 -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 45/52] 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 983e5021f3d3..24ceb7f8719b 100755
--- a/tools/perf/pmu-events/intel_metrics.py
+++ b/tools/perf/pmu-events/intel_metrics.py
@@ -815,6 +815,41 @@ 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("lpm_dir", [
+        Metric("lpm_dir_lookup_rate", "",
+               d_ratio(m2m_total, interval_sec), "requests/s"),
+        Metric("lpm_dir_lookup_hits", "",
+               d_ratio(m2m_hits, m2m_total), "100%"),
+        Metric("lpm_dir_lookup_misses", "",
+               d_ratio(m2m_miss, m2m_total), "100%"),
+        Metric("lpm_dir_update_requests", "",
+               d_ratio(m2m_upd + cha_upd, interval_sec), "requests/s"),
+        Metric("lpm_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",
@@ -944,6 +979,7 @@ def main() -> None:
         IntelMlp(),
         IntelPorts(),
         IntelSwpf(),
+        UncoreDir(),
         UncoreMem(),
         UncoreMemBw(),
     ])
-- 
2.51.2.1041.gc1ab5b90ca-goog