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Subject[PATCH v8 03/12] perf session: define bytes_transferred and bytes_compressed metrics
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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.budankov@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 414dd4cef680..8e6e0c7a89b9 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
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