[PATCH v7 03/12] perf session: define bytes_transferred and bytes_compressed metrics

[Alexey Budankov]

Define bytes_transferred and bytes_compressed metrics to calculate ratio
in the end of the data collection:

	compression ratio = bytes_transferred / bytes_compressed 

bytes_transferred accumulates the amount of bytes that was extracted from 
the mmaped kernel buffers for compression. bytes_compressed accumulates 
the amount of bytes that was received after applying compression.

Signed-off-by: Alexey Budankov <alexey.budankov@xxxxxxxxxxxxxxx>
---
 tools/perf/builtin-record.c | 14 +++++++++++++-
 tools/perf/util/env.h       |  1 +
 tools/perf/util/session.h   |  2 ++
 3 files changed, 16 insertions(+), 1 deletion(-)

diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 736a0f008959..bc0a895e7e80 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -1502,6 +1502,7 @@ static int __cmd_record(struct record *rec, int argc, const char **argv)
 		char samples[128];
 		const char *postfix = rec->timestamp_filename ?
 					".<timestamp>" : "";
+		float ratio = 0;
 
 		if (rec->samples && !rec->opts.full_auxtrace)
 			scnprintf(samples, sizeof(samples),
@@ -1509,9 +1510,20 @@ static int __cmd_record(struct record *rec, int argc, const char **argv)
 		else
 			samples[0] = '\0';
 
-		fprintf(stderr,	"[ perf record: Captured and wrote %.3f MB %s%s%s ]\n",
+		if (rec->session->bytes_transferred && rec->session->bytes_compressed) {
+			ratio = (float)rec->session->bytes_transferred/(float)rec->session->bytes_compressed;
+			session->header.env.comp_ratio = ratio + 0.5;
+		}
+
+		fprintf(stderr,	"[ perf record: Captured and wrote %.3f MB %s%s%s",
 			perf_data__size(data) / 1024.0 / 1024.0,
 			data->path, postfix, samples);
+		if (ratio) {
+			fprintf(stderr,	", compressed (original %.3f MB, ratio is %.3f)",
+					rec->session->bytes_transferred / 1024.0 / 1024.0,
+					ratio);
+		}
+		fprintf(stderr, " ]\n");
 	}
 
 out_delete_session:
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;
-- 
2.20.1