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

Alexey Budankov
2019-02-26T05:57:09Z

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.budankov@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;