linux-kernel - [RFC PATCH v8 4/7] perf stat: Add retire latency values into the expr_parse_ctx to prepare for final metric calculation

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Date: Wed, 15 May 2024 01:44:26 -0400
From: weilin.wang@...el.com
To: weilin.wang@...el.com,
	Namhyung Kim <namhyung@...nel.org>,
	Ian Rogers <irogers@...gle.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Jiri Olsa <jolsa@...nel.org>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Kan Liang <kan.liang@...ux.intel.com>
Cc: linux-perf-users@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Perry Taylor <perry.taylor@...el.com>,
	Samantha Alt <samantha.alt@...el.com>,
	Caleb Biggers <caleb.biggers@...el.com>
Subject: [RFC PATCH v8 4/7] perf stat: Add retire latency values into the expr_parse_ctx to prepare for final metric calculation

From: Weilin Wang <weilin.wang@...el.com>

Retire latency values of events are used in metric formulas. This update adds
code to process data from perf record for required retire latency values.

Signed-off-by: Weilin Wang <weilin.wang@...el.com>
Reviewed-by: Ian Rogers <irogers@...gle.com>
---
 tools/perf/util/stat-shadow.c | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/tools/perf/util/stat-shadow.c b/tools/perf/util/stat-shadow.c
index 3466aa952442..b97d23bfeac1 100644
--- a/tools/perf/util/stat-shadow.c
+++ b/tools/perf/util/stat-shadow.c
@@ -15,6 +15,7 @@
 #include <linux/zalloc.h>
 #include "iostat.h"
 #include "util/hashmap.h"
+#include "util/intel-tpebs.h"
 
 struct stats walltime_nsecs_stats;
 struct rusage_stats ru_stats;
@@ -355,6 +356,20 @@ static void print_nsecs(struct perf_stat_config *config,
 		print_metric(config, ctxp, NULL, NULL, "CPUs utilized", 0);
 }
 
+static int prepare_retire_lat(struct expr_parse_ctx *pctx,
+			     struct list_head *retire_lats)
+{
+	int ret = 0;
+	struct tpebs_retire_lat *t;
+
+	list_for_each_entry(t, retire_lats, nd) {
+		ret = expr__add_id_val(pctx, strdup(t->tpebs_name), t->val);
+		if (ret < 0)
+			return ret;
+	}
+	return ret;
+}
+
 static int prepare_metric(const struct metric_expr *mexp,
 			  const struct evsel *evsel,
 			  struct expr_parse_ctx *pctx,
@@ -369,6 +384,9 @@ static int prepare_metric(const struct metric_expr *mexp,
 		double val;
 		int source_count = 0;
 
+		if (metric_events[i]->retire_lat)
+			continue;
+
 		if (evsel__is_tool(metric_events[i])) {
 			struct stats *stats;
 			double scale;
@@ -486,6 +504,11 @@ static void generic_metric(struct perf_stat_config *config,
 		pctx->sctx.user_requested_cpu_list = strdup(config->user_requested_cpu_list);
 	pctx->sctx.runtime = runtime;
 	pctx->sctx.system_wide = config->system_wide;
+	i = prepare_retire_lat(pctx, &config->tpebs_results);
+	if (i < 0) {
+		expr__ctx_free(pctx);
+		return;
+	}
 	i = prepare_metric(mexp, evsel, pctx, aggr_idx);
 	if (i < 0) {
 		expr__ctx_free(pctx);
-- 
2.43.0