linux-kernel - [PATCH v12 09/16] perf record: Introduce bytes written stats

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Date:   Tue, 23 Nov 2021 17:08:05 +0300
From:   Alexey Bayduraev <alexey.v.bayduraev@...ux.intel.com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Jiri Olsa <jolsa@...hat.com>, Namhyung Kim <namhyung@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Andi Kleen <ak@...ux.intel.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Alexander Antonov <alexander.antonov@...ux.intel.com>,
        Alexei Budankov <abudankov@...wei.com>,
        Riccardo Mancini <rickyman7@...il.com>
Subject: [PATCH v12 09/16] perf record: Introduce bytes written stats

Introduce a function to calculate the total amount of data written
and use it to support the --max-size option.

Acked-by: Namhyung Kim <namhyung@...nel.org>
Reviewed-by: Riccardo Mancini <rickyman7@...il.com>
Tested-by: Riccardo Mancini <rickyman7@...il.com>
Signed-off-by: Alexey Bayduraev <alexey.v.bayduraev@...ux.intel.com>
---
 tools/perf/builtin-record.c | 21 ++++++++++++++++++---
 1 file changed, 18 insertions(+), 3 deletions(-)

diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index ce660691df1d..cd4f74c311e8 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -108,6 +108,7 @@ struct record_thread {
 	struct record		*rec;
 	unsigned long long	samples;
 	unsigned long		waking;
+	u64			bytes_written;
 };
 
 static __thread struct record_thread *thread;
@@ -191,10 +192,22 @@ static bool switch_output_time(struct record *rec)
 	       trigger_is_ready(&switch_output_trigger);
 }
 
+static u64 record__bytes_written(struct record *rec)
+{
+	int t;
+	u64 bytes_written = rec->bytes_written;
+	struct record_thread *thread_data = rec->thread_data;
+
+	for (t = 0; t < rec->nr_threads; t++)
+		bytes_written += thread_data[t].bytes_written;
+
+	return bytes_written;
+}
+
 static bool record__output_max_size_exceeded(struct record *rec)
 {
 	return rec->output_max_size &&
-	       (rec->bytes_written >= rec->output_max_size);
+	       (record__bytes_written(rec) >= rec->output_max_size);
 }
 
 static int record__write(struct record *rec, struct mmap *map __maybe_unused,
@@ -210,13 +223,15 @@ static int record__write(struct record *rec, struct mmap *map __maybe_unused,
 		return -1;
 	}
 
-	if (!(map && map->file))
+	if (map && map->file)
+		thread->bytes_written += size;
+	else
 		rec->bytes_written += size;
 
 	if (record__output_max_size_exceeded(rec) && !done) {
 		fprintf(stderr, "[ perf record: perf size limit reached (%" PRIu64 " KB),"
 				" stopping session ]\n",
-				rec->bytes_written >> 10);
+				record__bytes_written(rec) >> 10);
 		done = 1;
 	}
 
-- 
2.19.0