linux-kernel - [PATCH RFC 1/6] perf vendor events arm64: Add topdown L1 metrics for neoverse-n2

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Date:   Mon, 31 Oct 2022 19:11:29 +0800
From:   Jing Zhang <renyu.zj@...ux.alibaba.com>
To:     linux-arm-kernel@...ts.infradead.org,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     John Garry <john.garry@...wei.com>, Will Deacon <will@...nel.org>,
        James Clark <james.clark@....com>,
        Mike Leach <mike.leach@...aro.org>,
        Leo Yan <leo.yan@...aro.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Andrew Kilroy <andrew.kilroy@....com>,
        Shuai Xue <xueshuai@...ux.alibaba.com>,
        Zhuo Song <zhuo.song@...ux.alibaba.com>
Subject: [PATCH RFC 1/6] perf vendor events arm64: Add topdown L1 metrics for neoverse-n2

The calculation formula of topdown L1 is from the document:
https://documentation-service.arm.com/static/60250c7395978b529036da86?token=

Since neoverse-n2 does not yet support topdown L2, metricgroups such
as Cache, TLB, Branch, InstructionsMix, and PEutilization will be
added to further analysis of performance bottlenecks in the following
patches.

Signed-off-by: Jing Zhang <renyu.zj@...ux.alibaba.com>
---
 .../arch/arm64/arm/neoverse-n2/metrics.json        | 30 ++++++++++++++++++++++
 1 file changed, 30 insertions(+)
 create mode 100644 tools/perf/pmu-events/arch/arm64/arm/neoverse-n2/metrics.json

diff --git a/tools/perf/pmu-events/arch/arm64/arm/neoverse-n2/metrics.json b/tools/perf/pmu-events/arch/arm64/arm/neoverse-n2/metrics.json
new file mode 100644
index 0000000..b6b3b19
--- /dev/null
+++ b/tools/perf/pmu-events/arch/arm64/arm/neoverse-n2/metrics.json
@@ -0,0 +1,30 @@
+[
+    {
+        "MetricExpr": "stall_slot_frontend / (5 * cpu_cycles)",
+        "PublicDescription": "Frontend bound L1 topdown metric",
+        "BriefDescription": "Frontend bound L1 topdown metric",
+        "MetricGroup": "TopDownL1",
+        "MetricName": "frontend_bound"
+    },
+    {
+        "MetricExpr": "(1 - op_retired / op_spec) * (1 - stall_slot / (5 * cpu_cycles))",
+        "PublicDescription": "Wasted L1 topdown metric",
+        "BriefDescription": "Wasted L1 topdown metric",
+        "MetricGroup": "TopDownL1",
+        "MetricName": "wasted"
+    },
+    {
+        "MetricExpr": "(op_retired / op_spec) * (1 - stall_slot / (5 * cpu_cycles))",
+        "PublicDescription": "Retiring L1 topdown metric",
+        "BriefDescription": "Retiring L1 topdown metric",
+        "MetricGroup": "TopDownL1",
+        "MetricName": "retiring"
+    },
+    {
+        "MetricExpr": "stall_slot_backend / (5 * cpu_cycles)",
+        "PublicDescription": "Backend Bound L1 topdown metric",
+        "BriefDescription": "Backend Bound L1 topdown metric",
+        "MetricGroup": "TopDownL1",
+        "MetricName": "backend_bound"
+    }
+]
\ No newline at end of file
-- 
1.8.3.1