[PATCH 48/73] perf session: Define 'bytes_transferred' and 'bytes_compressed' metrics

[Arnaldo Carvalho de Melo]

From: Alexey Budankov <alexey.budan...@linux.intel.com>

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.budan...@linux.intel.com>
Reviewed-by: Jiri Olsa <jo...@kernel.org>
Cc: Alexander Shishkin <alexander.shish...@linux.intel.com>
Cc: Andi Kleen <a...@linux.intel.com>
Cc: Namhyung Kim <namhy...@kernel.org>
Cc: Peter Zijlstra <pet...@infradead.org>
Link: 
http://lkml.kernel.org/r/1d4bf499-cb03-26dc-6fc6-f14fec762...@linux.intel.com
Signed-off-by: Arnaldo Carvalho de Melo <a...@redhat.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 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 @@ 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:
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;
-- 
2.20.1