[PATCH v10 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.budan...@linux.intel.com>
---
 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 f55302dec440..51b7f23a0c7a 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -1166,6 +1166,7 @@ static int __cmd_record(struct record *rec, int argc, 
const char **argv)
        struct perf_session *session;
        bool disabled = false, draining = false;
        int fd;
+       float ratio = 0;
 
        atexit(record__sig_exit);
        signal(SIGCHLD, sig_handler);
@@ -1463,6 +1464,11 @@ 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;
 
@@ -1509,9 +1515,15 @@ 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:
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