[PATCH v3 3/9] perf session: define bytes_transferred and bytes_compressed metrics

[Alexey Budankov]

Define bytes_transferred and bytes_compressed metrics to calculate
comp_ratio=transferred/compressed in the end of the data collection.

bytes_transferred accumulates the amount of bytes that was captured from
the mmaped kernel buffers for compression. bytes_compressed accumulates
the amount of bytes that was received after applying compression to
move to a storage.

Signed-off-by: Alexey Budankov <alexey.budankov@xxxxxxxxxxxxxxx>
---
 tools/perf/builtin-record.c | 8 ++++++++
 tools/perf/util/env.h       | 1 +
 tools/perf/util/session.h   | 2 ++
 3 files changed, 11 insertions(+)

diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 6235cc6b59e9..299f484f3e30 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -1450,6 +1450,14 @@ static int __cmd_record(struct record *rec, int argc, const char **argv)
 	record__mmap_read_all(rec, true);
 	record__aio_mmap_read_sync(rec);
 
+	if (!quiet && rec->session->bytes_transferred && rec->session->bytes_compressed) {
+		float ratio = (float)rec->session->bytes_transferred/(float)rec->session->bytes_compressed;
+
+		session->header.env.comp_ratio = ratio + 0.5;
+		fprintf(stderr,	"[ perf record: Compressed %.3f MB to %.3f MB, ratio is %.3f ]\n",
+			rec->session->bytes_transferred / 1024.0 / 1024.0, rec->session->bytes_compressed / 1024.0 / 1024.0, ratio);
+	}
+
 	if (forks) {
 		int exit_status;
 
diff --git a/tools/perf/util/env.h b/tools/perf/util/env.h
index d01b8355f4ca..fb39e9af128f 100644
--- a/tools/perf/util/env.h
+++ b/tools/perf/util/env.h
@@ -64,6 +64,7 @@ struct perf_env {
 	struct memory_node	*memory_nodes;
 	unsigned long long	 memory_bsize;
 	u64                     clockid_res_ns;
+	u32                     comp_ratio;
 };
 
 extern struct perf_env perf_env;
diff --git a/tools/perf/util/session.h b/tools/perf/util/session.h
index d96eccd7d27f..0e14884f28b2 100644
--- a/tools/perf/util/session.h
+++ b/tools/perf/util/session.h
@@ -35,6 +35,8 @@ struct perf_session {
 	struct ordered_events	ordered_events;
 	struct perf_data	*data;
 	struct perf_tool	*tool;
+	u64			bytes_transferred;
+	u64			bytes_compressed;
 };
 
 struct perf_tool;