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Subject[PATCH v8 08/22] perf record: Init data file at mmap buffer object
Date
Initialize data files located at mmap buffer objects so trace data
can be written into several data file located at data directory.

Acked-by: Andi Kleen <ak@linux.intel.com>
Acked-by: Namhyung Kim <namhyung@gmail.com>
Signed-off-by: Alexey Bayduraev <alexey.v.bayduraev@linux.intel.com>
---
tools/perf/builtin-record.c | 41 ++++++++++++++++++++++++++++++-------
tools/perf/util/record.h | 1 +
2 files changed, 35 insertions(+), 7 deletions(-)

diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index f1a6edc0824c..2ade17308467 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -160,6 +160,11 @@ static const char *affinity_tags[PERF_AFFINITY_MAX] = {
"SYS", "NODE", "CPU"
};

+static int record__threads_enabled(struct record *rec)
+{
+ return rec->opts.threads_spec;
+}
+
static bool switch_output_signal(struct record *rec)
{
return rec->switch_output.signal &&
@@ -1070,7 +1075,7 @@ static void record__free_thread_data(struct record *rec)
static int record__mmap_evlist(struct record *rec,
struct evlist *evlist)
{
- int ret;
+ int i, ret;
struct record_opts *opts = &rec->opts;
bool auxtrace_overwrite = opts->auxtrace_snapshot_mode ||
opts->auxtrace_sample_mode;
@@ -1109,6 +1114,18 @@ static int record__mmap_evlist(struct record *rec,
if (ret)
return ret;

+ if (record__threads_enabled(rec)) {
+ ret = perf_data__create_dir(&rec->data, evlist->core.nr_mmaps);
+ if (ret)
+ return ret;
+ for (i = 0; i < evlist->core.nr_mmaps; i++) {
+ if (evlist->mmap)
+ evlist->mmap[i].file = &rec->data.dir.files[i];
+ if (evlist->overwrite_mmap)
+ evlist->overwrite_mmap[i].file = &rec->data.dir.files[i];
+ }
+ }
+
return 0;
}

@@ -1416,8 +1433,12 @@ static int record__mmap_read_evlist(struct record *rec, struct evlist *evlist,
/*
* Mark the round finished in case we wrote
* at least one event.
+ *
+ * No need for round events in directory mode,
+ * because per-cpu maps and files have data
+ * sorted by kernel.
*/
- if (bytes_written != rec->bytes_written)
+ if (!record__threads_enabled(rec) && bytes_written != rec->bytes_written)
rc = record__write(rec, NULL, &finished_round_event, sizeof(finished_round_event));

if (overwrite)
@@ -1532,7 +1553,9 @@ static void record__init_features(struct record *rec)
if (!rec->opts.use_clockid)
perf_header__clear_feat(&session->header, HEADER_CLOCK_DATA);

- perf_header__clear_feat(&session->header, HEADER_DIR_FORMAT);
+ if (!record__threads_enabled(rec))
+ perf_header__clear_feat(&session->header, HEADER_DIR_FORMAT);
+
if (!record__comp_enabled(rec))
perf_header__clear_feat(&session->header, HEADER_COMPRESSED);

@@ -1543,15 +1566,21 @@ static void
record__finish_output(struct record *rec)
{
struct perf_data *data = &rec->data;
- int fd = perf_data__fd(data);
+ int i, fd = perf_data__fd(data);

if (data->is_pipe)
return;

rec->session->header.data_size += rec->bytes_written;
data->file.size = lseek(perf_data__fd(data), 0, SEEK_CUR);
+ if (record__threads_enabled(rec)) {
+ for (i = 0; i < data->dir.nr; i++)
+ data->dir.files[i].size = lseek(data->dir.files[i].fd, 0, SEEK_CUR);
+ }

if (!rec->no_buildid) {
+ /* this will be recalculated during process_buildids() */
+ rec->samples = 0;
process_buildids(rec);

if (rec->buildid_all)
@@ -2489,8 +2518,6 @@ static int __cmd_record(struct record *rec, int argc, const char **argv)
status = err;

record__synthesize(rec, true);
- /* this will be recalculated during process_buildids() */
- rec->samples = 0;

if (!err) {
if (!rec->timestamp_filename) {
@@ -3283,7 +3310,7 @@ int cmd_record(int argc, const char **argv)
goto out_opts;
}

- if (rec->opts.kcore)
+ if (rec->opts.kcore || record__threads_enabled(rec))
rec->data.is_dir = true;

if (rec->opts.comp_level != 0) {
diff --git a/tools/perf/util/record.h b/tools/perf/util/record.h
index 68f471d9a88b..4d68b7e27272 100644
--- a/tools/perf/util/record.h
+++ b/tools/perf/util/record.h
@@ -77,6 +77,7 @@ struct record_opts {
int ctl_fd;
int ctl_fd_ack;
bool ctl_fd_close;
+ int threads_spec;
};

extern const char * const *record_usage;
--
2.19.0
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