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From: Jin Yao <yao.jin@linux.intel.com>
To: acme@kernel.org, jolsa@kernel.org, peterz@infradead.org,
	mingo@redhat.com, alexander.shishkin@linux.intel.com
Cc: Linux-kernel@vger.kernel.org, ak@linux.intel.com,
	kan.liang@intel.com, yao.jin@intel.com,
	Jin Yao <yao.jin@linux.intel.com>
Subject: [PATCH v5 3/5] perf stat: Copy counts from prev_raw_counts to evsel->counts
Date: Thu, 14 May 2020 13:36:36 +0800	[thread overview]
Message-ID: <20200514053638.3736-4-yao.jin@linux.intel.com> (raw)
In-Reply-To: <20200514053638.3736-1-yao.jin@linux.intel.com>

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 use 'evsel->prev_raw_counts' which is updated in
each interval and it's saved with the latest counts. Before reporting
the summary, we copy the counts from evsel->prev_raw_counts to
evsel->counts, and next we just follow non-interval processing.

 v5:
 ---
 Don't save the previous aggr value to the member of [cpu0,thread0]
 in perf_counts. Originally that was a trick because the
 perf_stat_process_counter would create aggr values from per cpu
 values. But we don't need to do that all the time. We will
 handle it in next patch.

 v4:
 ---
 Change the commit message.
 No functional change.

Signed-off-by: Jin Yao <yao.jin@linux.intel.com>
---
 tools/perf/util/stat.c | 24 ++++++++++++++++++++++++
 tools/perf/util/stat.h |  1 +
 2 files changed, 25 insertions(+)

diff --git a/tools/perf/util/stat.c b/tools/perf/util/stat.c
index e397815f0dfb..aadc723ce871 100644
--- a/tools/perf/util/stat.c
+++ b/tools/perf/util/stat.c
@@ -225,6 +225,30 @@ void perf_evlist__reset_prev_raw_counts(struct evlist *evlist)
 		evsel__reset_prev_raw_counts(evsel);
 }
 
+static void perf_evsel__copy_prev_raw_counts(struct evsel *evsel)
+{
+	int ncpus = evsel__nr_cpus(evsel);
+	int nthreads = perf_thread_map__nr(evsel->core.threads);
+
+	for (int thread = 0; thread < nthreads; thread++) {
+		for (int cpu = 0; cpu < ncpus; cpu++) {
+			*perf_counts(evsel->counts, cpu, thread) =
+				*perf_counts(evsel->prev_raw_counts, cpu,
+					     thread);
+		}
+	}
+
+	evsel->counts->aggr = evsel->prev_raw_counts->aggr;
+}
+
+void perf_evlist__copy_prev_raw_counts(struct evlist *evlist)
+{
+	struct evsel *evsel;
+
+	evlist__for_each_entry(evlist, evsel)
+		perf_evsel__copy_prev_raw_counts(evsel);
+}
+
 static void zero_per_pkg(struct evsel *counter)
 {
 	if (counter->per_pkg_mask)
diff --git a/tools/perf/util/stat.h b/tools/perf/util/stat.h
index b4fdfaa7f2c0..62cf72c71869 100644
--- a/tools/perf/util/stat.h
+++ b/tools/perf/util/stat.h
@@ -198,6 +198,7 @@ int perf_evlist__alloc_stats(struct evlist *evlist, bool alloc_raw);
 void perf_evlist__free_stats(struct evlist *evlist);
 void perf_evlist__reset_stats(struct evlist *evlist);
 void perf_evlist__reset_prev_raw_counts(struct evlist *evlist);
+void perf_evlist__copy_prev_raw_counts(struct evlist *evlist);
 
 int perf_stat_process_counter(struct perf_stat_config *config,
 			      struct evsel *counter);
-- 
2.17.1


  parent reply	other threads:[~2020-05-14  5:38 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-14  5:36 [PATCH v5 0/5] perf stat: Support overall statistics for interval mode Jin Yao
2020-05-14  5:36 ` [PATCH v5 1/5] perf stat: Fix wrong per-thread runtime stat " Jin Yao
2020-05-14  5:36 ` [PATCH v5 2/5] perf counts: Reset prev_raw_counts counts Jin Yao
2020-05-14  5:36 ` Jin Yao [this message]
2020-05-14  5:36 ` [PATCH v5 4/5] perf stat: Save aggr value to first member of prev_raw_counts Jin Yao
2020-05-18 12:48   ` Jiri Olsa
2020-05-18 14:44     ` Jin, Yao
2020-05-14  5:36 ` [PATCH v5 5/5] perf stat: Report summary for interval mode Jin Yao
2020-05-18 12:47   ` Jiri Olsa
2020-05-19  2:51     ` Jin, Yao
2020-05-14  9:53 ` [PATCH v5 0/5] perf stat: Support overall statistics " kajoljain
2020-05-14 13:44   ` Jin, Yao

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