linux-kernel - [PATCH v2 12/12] perf jevents: Add context switch metrics for AMD

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Message-Id: <20240301184737.2660108-13-irogers@google.com>
Date: Fri,  1 Mar 2024 10:47:37 -0800
From: Ian Rogers <irogers@...gle.com>
To: Sandipan Das <sandipan.das@....com>, Ravi Bangoria <ravi.bangoria@....com>, 
	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>, 
	John Garry <john.g.garry@...cle.com>, Kan Liang <kan.liang@...ux.intel.com>, 
	Jing Zhang <renyu.zj@...ux.alibaba.com>, Thomas Richter <tmricht@...ux.ibm.com>, 
	James Clark <james.clark@....com>, linux-kernel@...r.kernel.org, 
	linux-perf-users@...r.kernel.org, Stephane Eranian <eranian@...gle.com>
Subject: [PATCH v2 12/12] perf jevents: Add context switch metrics for AMD

Metrics break down context switches for different kinds of
instruction.

Signed-off-by: Ian Rogers <irogers@...gle.com>
---
 tools/perf/pmu-events/amd_metrics.py | 32 ++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)

diff --git a/tools/perf/pmu-events/amd_metrics.py b/tools/perf/pmu-events/amd_metrics.py
index 91f323c1a149..377ce413d051 100755
--- a/tools/perf/pmu-events/amd_metrics.py
+++ b/tools/perf/pmu-events/amd_metrics.py
@@ -125,6 +125,37 @@ def AmdBr():
                      description="breakdown of retired branch instructions")
 
 
+def AmdCtxSw() -> MetricGroup:
+  cs = Event("context\-switches")
+  metrics = [
+      Metric("cs_rate", "Context switches per second", d_ratio(cs, interval_sec), "ctxsw/s")
+  ]
+
+  ev = Event("instructions")
+  metrics.append(Metric("cs_instr", "Instructions per context switch",
+                        d_ratio(ev, cs), "instr/cs"))
+
+  ev = Event("cycles")
+  metrics.append(Metric("cs_cycles", "Cycles per context switch",
+                        d_ratio(ev, cs), "cycles/cs"))
+
+  ev = Event("ls_dispatch.ld_dispatch")
+  metrics.append(Metric("cs_loads", "Loads per context switch",
+                          d_ratio(ev, cs), "loads/cs"))
+
+  ev = Event("ls_dispatch.store_dispatch")
+  metrics.append(Metric("cs_stores", "Stores per context switch",
+                        d_ratio(ev, cs), "stores/cs"))
+
+  ev = Event("ex_ret_brn_tkn")
+  metrics.append(Metric("cs_br_taken", "Branches taken per context switch",
+                        d_ratio(ev, cs), "br_taken/cs"))
+
+  return MetricGroup("cs", metrics,
+                     description = ("Number of context switches per second, instructions "
+                                    "retired & core cycles between context switches"))
+
+
 def AmdIlp() -> MetricGroup:
     tsc = Event("msr/tsc/")
     c0 = Event("msr/mperf/")
@@ -589,6 +620,7 @@ def UncoreL3():
 
 all_metrics = MetricGroup("", [
     AmdBr(),
+    AmdCtxSw(),
     AmdIlp(),
     AmdDtlb(),
     AmdItlb(),
-- 
2.44.0.278.ge034bb2e1d-goog