[PATCH v1 12/13] perf jevents: Add context switch metrics for AMD

Ian Rogers
2024-02-29T00:16:11Z

Metrics break down context switches for different kinds of
instruction.

Signed-off-by: Ian Rogers <irogers@google.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