[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.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 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