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@linux.intel.com>
Reviewed-by: Jiri Olsa <jolsa@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1d4bf499-cb03-26dc-6fc6-f14fec7622ce@linux.intel.comSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

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 @@ 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 (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 @@ 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",
+		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:

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;

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;