[PATCH v3 3/9] perf session: define bytes_transferred and bytes_compressed metrics

[Alexey Budankov]

Define bytes_transferred and bytes_compressed metrics to calculate
comp_ratio=transferred/compressed in the end of the data collection.

bytes_transferred accumulates the amount of bytes that was captured from
the mmaped kernel buffers for compression. bytes_compressed accumulates
the amount of bytes that was received after applying compression to
move to a storage.

Signed-off-by: Alexey Budankov <alexey.budan...@linux.intel.com>
---
 tools/perf/builtin-record.c | 8 ++++++++
 tools/perf/util/env.h       | 1 +
 tools/perf/util/session.h   | 2 ++
 3 files changed, 11 insertions(+)

diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 6235cc6b59e9..299f484f3e30 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -1450,6 +1450,14 @@ 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 (!quiet && rec->session->bytes_transferred && 
rec->session->bytes_compressed) {
+               float ratio = 
(float)rec->session->bytes_transferred/(float)rec->session->bytes_compressed;
+
+               session->header.env.comp_ratio = ratio + 0.5;
+               fprintf(stderr, "[ perf record: Compressed %.3f MB to %.3f MB, 
ratio is %.3f ]\n",
+                       rec->session->bytes_transferred / 1024.0 / 1024.0, 
rec->session->bytes_compressed / 1024.0 / 1024.0, ratio);
+       }
+
        if (forks) {
                int exit_status;
 
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;