[PATCH v3 12/12] perf jevents: Add context switch metrics for AMD

[Ian Rogers]

Metrics break down context switches for different kinds of
instruction.

Signed-off-by: Ian Rogers <irogers@xxxxxxxxxx>
---
 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 bf5c4ffa53e9..bc70743c2f11 100755
--- a/tools/perf/pmu-events/amd_metrics.py
+++ b/tools/perf/pmu-events/amd_metrics.py
@@ -120,6 +120,37 @@ 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/")
@@ -613,6 +644,7 @@ def main() -> None:
 
   all_metrics = MetricGroup("", [
       AmdBr(),
+      AmdCtxSw(),
       AmdIlp(),
       AmdDtlb(),
       AmdItlb(),
-- 
2.44.0.278.ge034bb2e1d-goog