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perf jevents: Add context switch metrics for AMD

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Metrics break down context switches for different kinds of
instruction.

Reviewed-by: Sandipan Das <sandipan.das@amd.com>
Signed-off-by: Ian Rogers <irogers@google.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Benjamin Gray <bgray@linux.ibm.com>
Cc: Caleb Biggers <caleb.biggers@intel.com>
Cc: Edward Baker <edward.baker@intel.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: James Clark <james.clark@linaro.org>
Cc: Jing Zhang <renyu.zj@linux.alibaba.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: John Garry <john.g.garry@oracle.com>
Cc: Leo Yan <leo.yan@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Perry Taylor <perry.taylor@intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Falcon <thomas.falcon@intel.com>
Cc: Weilin Wang <weilin.wang@intel.com>
Cc: Xu Yang <xu.yang_2@nxp.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Ian Rogers 2026-01-27 10:44:42 -08:00 committed by Arnaldo Carvalho de Melo
parent fb4c058174
commit 3563030d4f
1 changed files with 33 additions and 0 deletions
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33
tools/perf/pmu-events/amd_metrics.py
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@ -122,6 +122,38 @@ def AmdBr():
description="breakdown of retired branch instructions")
def AmdCtxSw() -> MetricGroup:
cs = Event("context\\-switches")
metrics = [
Metric("lpm_cs_rate", "Context switches per second",
d_ratio(cs, interval_sec), "ctxsw/s")
]
ev = Event("instructions")
metrics.append(Metric("lpm_cs_instr", "Instructions per context switch",
d_ratio(ev, cs), "instr/cs"))
ev = Event("cycles")
metrics.append(Metric("lpm_cs_cycles", "Cycles per context switch",
d_ratio(ev, cs), "cycles/cs"))
ev = Event("ls_dispatch.pure_ld", "ls_dispatch.ld_dispatch")
metrics.append(Metric("lpm_cs_loads", "Loads per context switch",
d_ratio(ev, cs), "loads/cs"))
ev = Event("ls_dispatch.pure_st", "ls_dispatch.store_dispatch")
metrics.append(Metric("lpm_cs_stores", "Stores per context switch",
d_ratio(ev, cs), "stores/cs"))
ev = Event("ex_ret_brn_tkn")
metrics.append(Metric("lpm_cs_br_taken", "Branches taken per context switch",
d_ratio(ev, cs), "br_taken/cs"))
return MetricGroup("lpm_cs", metrics,
description=("Number of context switches per second, instructions "
"retired & core cycles between context switches"))
def AmdDtlb() -> Optional[MetricGroup]:
global _zen_model
if _zen_model >= 4:
@ -438,6 +470,7 @@ def main() -> None:
all_metrics = MetricGroup("", [
AmdBr(),
AmdCtxSw(),
AmdDtlb(),
AmdItlb(),
AmdLdSt(),