linux-kernel - [PATCH 1/2] perf evsel: Create counts for collecting summary data

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Message-Id: <20200430030740.27156-2-yao.jin@linux.intel.com>
Date:   Thu, 30 Apr 2020 11:07:39 +0800
From:   Jin Yao <yao.jin@...ux.intel.com>
To:     acme@...nel.org, jolsa@...nel.org, peterz@...radead.org,
        mingo@...hat.com, alexander.shishkin@...ux.intel.com
Cc:     Linux-kernel@...r.kernel.org, ak@...ux.intel.com,
        kan.liang@...el.com, yao.jin@...el.com,
        Jin Yao <yao.jin@...ux.intel.com>
Subject: [PATCH 1/2] perf evsel: Create counts for collecting summary data

It would be useful to support the overall statistics for perf-stat
interval mode. For example, report the summary at the end of
"perf-stat -I" output.

But since perf-stat can support many aggregation modes, such as
--per-thread, --per-socket, -M and etc, we need a solution which
doesn't bring much complexity.

The idea is to create new 'evsel->summary_counts' which sums up the
counts delta per interval. Before reporting the summary, we copy the
data from evsel->summary_counts to evsel->counts, and next we just
follow current code.

Signed-off-by: Jin Yao <yao.jin@...ux.intel.com>
---
 tools/perf/util/evsel.c | 10 ++++++++--
 tools/perf/util/evsel.h |  1 +
 tools/perf/util/stat.c  | 20 ++++++++++++++++++++
 3 files changed, 29 insertions(+), 2 deletions(-)

diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index 6a571d322bb2..7e878583f7a4 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -1286,22 +1286,28 @@ void evsel__delete(struct evsel *evsel)
 void perf_evsel__compute_deltas(struct evsel *evsel, int cpu, int thread,
 				struct perf_counts_values *count)
 {
-	struct perf_counts_values tmp;
+	struct perf_counts_values tmp, *summary;
 
-	if (!evsel->prev_raw_counts)
+	if (!evsel->prev_raw_counts || !evsel->summary_counts)
 		return;
 
 	if (cpu == -1) {
 		tmp = evsel->prev_raw_counts->aggr;
 		evsel->prev_raw_counts->aggr = *count;
+		summary = &evsel->summary_counts->aggr;
 	} else {
 		tmp = *perf_counts(evsel->prev_raw_counts, cpu, thread);
 		*perf_counts(evsel->prev_raw_counts, cpu, thread) = *count;
+		summary = perf_counts(evsel->summary_counts, cpu, thread);
 	}
 
 	count->val = count->val - tmp.val;
 	count->ena = count->ena - tmp.ena;
 	count->run = count->run - tmp.run;
+
+	summary->val += count->val;
+	summary->ena += count->ena;
+	summary->run += count->run;
 }
 
 void perf_counts_values__scale(struct perf_counts_values *count,
diff --git a/tools/perf/util/evsel.h b/tools/perf/util/evsel.h
index bf999e3c50c7..3dd690235f9b 100644
--- a/tools/perf/util/evsel.h
+++ b/tools/perf/util/evsel.h
@@ -46,6 +46,7 @@ struct evsel {
 	char			*filter;
 	struct perf_counts	*counts;
 	struct perf_counts	*prev_raw_counts;
+	struct perf_counts	*summary_counts;
 	int			idx;
 	unsigned long		max_events;
 	unsigned long		nr_events_printed;
diff --git a/tools/perf/util/stat.c b/tools/perf/util/stat.c
index 242476eb808c..cf09cd7675c2 100644
--- a/tools/perf/util/stat.c
+++ b/tools/perf/util/stat.c
@@ -171,6 +171,24 @@ static void perf_evsel__reset_prev_raw_counts(struct evsel *evsel)
        }
 }
 
+static int perf_evsel__alloc_summary_counts(struct evsel *evsel,
+					    int ncpus, int nthreads)
+{
+	struct perf_counts *counts;
+
+	counts = perf_counts__new(ncpus, nthreads);
+	if (counts)
+		evsel->summary_counts = counts;
+
+	return counts ? 0 : -ENOMEM;
+}
+
+static void perf_evsel__free_summary_counts(struct evsel *evsel)
+{
+	perf_counts__delete(evsel->summary_counts);
+	evsel->summary_counts = NULL;
+}
+
 static int perf_evsel__alloc_stats(struct evsel *evsel, bool alloc_raw)
 {
 	int ncpus = perf_evsel__nr_cpus(evsel);
@@ -178,6 +196,7 @@ static int perf_evsel__alloc_stats(struct evsel *evsel, bool alloc_raw)
 
 	if (perf_evsel__alloc_stat_priv(evsel) < 0 ||
 	    perf_evsel__alloc_counts(evsel, ncpus, nthreads) < 0 ||
+	    perf_evsel__alloc_summary_counts(evsel, ncpus, nthreads) < 0 ||
 	    (alloc_raw && perf_evsel__alloc_prev_raw_counts(evsel, ncpus, nthreads) < 0))
 		return -ENOMEM;
 
@@ -208,6 +227,7 @@ void perf_evlist__free_stats(struct evlist *evlist)
 		perf_evsel__free_stat_priv(evsel);
 		perf_evsel__free_counts(evsel);
 		perf_evsel__free_prev_raw_counts(evsel);
+		perf_evsel__free_summary_counts(evsel);
 	}
 }
 
-- 
2.17.1