[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
Date: Wed May 15 2024 - 01:45:26 EST


From: Weilin Wang <weilin.wang@xxxxxxxxx>

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@xxxxxxxxx>
Reviewed-by: Ian Rogers <irogers@xxxxxxxxxx>
---
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