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

Alexey Bayduraev
2021-11-23T14:09:45Z

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@kernel.org>
Reviewed-by: Riccardo Mancini <rickyman7@gmail.com>
Tested-by: Riccardo Mancini <rickyman7@gmail.com>
Signed-off-by: Alexey Bayduraev <alexey.v.bayduraev@linux.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