[tip:perf/core] perf session: Define 'bytes_transferred' and 'bytes_compressed' metrics

[tip-bot for Alexey Budankov]

Commit-ID:  d3c8c08e75c4cbb6a940323092b40fcfd1de5380
Gitweb:     https://git.kernel.org/tip/d3c8c08e75c4cbb6a940323092b40fcfd1de5380
Author:     Alexey Budankov <alexey.budankov@xxxxxxxxxxxxxxx>
AuthorDate: Mon, 18 Mar 2019 20:41:02 +0300
Committer:  Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
CommitDate: Wed, 15 May 2019 16:36:49 -0300

perf session: Define 'bytes_transferred' and 'bytes_compressed' metrics

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

	compression ratio = bytes_transferred / bytes_compressed

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

Signed-off-by: Alexey Budankov <alexey.budankov@xxxxxxxxxxxxxxx>
Reviewed-by: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Alexander Shishkin <alexander.shishkin@xxxxxxxxxxxxxxx>
Cc: Andi Kleen <ak@xxxxxxxxxxxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Link: http://lkml.kernel.org/r/1d4bf499-cb03-26dc-6fc6-f14fec7622ce@xxxxxxxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
 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 d2b5a22b7249..386e665a166f 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -1186,6 +1186,7 @@ static int __cmd_record(struct record *rec, int argc, const char **argv)
 	bool disabled = false, draining = false;
 	struct perf_evlist *sb_evlist = NULL;
 	int fd;
+	float ratio = 0;
 
 	atexit(record__sig_exit);
 	signal(SIGCHLD, sig_handler);
@@ -1491,6 +1492,11 @@ out_child:
 	record__mmap_read_all(rec, true);
 	record__aio_mmap_read_sync(rec);
 
+	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;
+	}
+
 	if (forks) {
 		int exit_status;
 
@@ -1537,9 +1543,15 @@ out_child:
 		else
 			samples[0] = '\0';
 
-		fprintf(stderr,	"[ perf record: Captured and wrote %.3f MB %s%s%s ]\n",
+		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 4f8e2b485c01..34868ca7efd1 100644
--- a/tools/perf/util/env.h
+++ b/tools/perf/util/env.h
@@ -62,6 +62,7 @@ struct perf_env {
 	struct cpu_topology_map	*cpu;
 	struct cpu_cache_level	*caches;
 	int			 caches_cnt;
+	u32			comp_ratio;
 	struct numa_node	*numa_nodes;
 	struct memory_node	*memory_nodes;
 	unsigned long long	 memory_bsize;
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;