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Subject[PATCH 3/5] perf record: Add --dir option to store data in directory
Date
Adding --dir option to store data in directory. It's next
step for multiple threads in record. It's now possible to
make directory data via --dir option, like:

$ perf record --dir perf bench sched messaging
$ ls -l perf.data
total 344
-rw-------. 1 jolsa jolsa 43864 Jan 20 22:26 data.0
-rw-------. 1 jolsa jolsa 30464 Jan 20 22:26 data.1
-rw-------. 1 jolsa jolsa 53816 Jan 20 22:26 data.2
-rw-------. 1 jolsa jolsa 30368 Jan 20 22:26 data.3
-rw-------. 1 jolsa jolsa 40088 Jan 20 22:26 data.4
-rw-------. 1 jolsa jolsa 42592 Jan 20 22:26 data.5
-rw-------. 1 jolsa jolsa 56136 Jan 20 22:26 data.6
-rw-------. 1 jolsa jolsa 25992 Jan 20 22:26 data.7
-rw-------. 1 jolsa jolsa 8832 Jan 20 22:26 header

There's a data file created for every cpu and it's storing
data for those cpu maps.

It's possible to transform directory data into standard
perf.data file via following inject command:

$ perf inject -o perf.data.file -i perf.data

The --dir option enabled DIR_FORMAT feature to be stored
in header file to indicate the directory layout.

Don't allow to use --dir with --aio yet. It needs
to be investigated first.

Link: http://lkml.kernel.org/n/tip-0kjm8wpglzu2tm18tpagfm4d@git.kernel.org
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
---
tools/perf/Documentation/perf-record.txt | 3 +
tools/perf/builtin-record.c | 80 ++++++++++++++++++++++--
tools/perf/util/mmap.h | 23 +++----
3 files changed, 90 insertions(+), 16 deletions(-)

diff --git a/tools/perf/Documentation/perf-record.txt b/tools/perf/Documentation/perf-record.txt
index 8f0c2be34848..445b7a4eb130 100644
--- a/tools/perf/Documentation/perf-record.txt
+++ b/tools/perf/Documentation/perf-record.txt
@@ -524,6 +524,9 @@ config terms. For example: 'cycles/overwrite/' and 'instructions/no-overwrite/'.

Implies --tail-synthesize.

+--dir::
+Store data into directory with one data file for cpu.
+
SEE ALSO
--------
linkperf:perf-stat[1], linkperf:perf-list[1]
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index a468d882e74f..26981be13aa0 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -112,10 +112,13 @@ static bool switch_output_time(struct record *rec)
trigger_is_ready(&switch_output_trigger);
}

-static int record__write(struct record *rec, struct perf_mmap *map __maybe_unused,
+static int record__write(struct record *rec, struct perf_mmap *map,
void *bf, size_t size)
{
- struct perf_data_file *file = &rec->session->data->file;
+ struct perf_data_file *file = &rec->data.file;
+
+ if (map && map->file)
+ file = map->file;

if (perf_data_file__write(file, bf, size) < 0) {
pr_err("failed to write perf data, error: %m\n");
@@ -124,6 +127,15 @@ static int record__write(struct record *rec, struct perf_mmap *map __maybe_unuse

rec->bytes_written += size;

+ /*
+ * Update header file size manualy, data files size are
+ * ok to be updated by stat command, but header files
+ * contains more stuff, so we need to track data size
+ * manualy.
+ */
+ if (file == &rec->data.file)
+ rec->session->header.data_size += size;
+
if (switch_output_size(rec))
trigger_hit(&switch_output_trigger);

@@ -247,6 +259,7 @@ static int record__aio_pushfn(void *to, struct aiocb *cblock, void *bf, size_t s
ret = record__aio_write(cblock, trace_fd, bf, size, off);
if (!ret) {
rec->bytes_written += size;
+ rec->session->header.data_size += size;
if (switch_output_size(rec))
trigger_hit(&switch_output_trigger);
}
@@ -564,6 +577,25 @@ static int record__mmap_evlist(struct record *rec,
return 0;
}

+static int record__mmap_dir_data(struct record *rec)
+{
+ struct perf_evlist *evlist = rec->evlist;
+ struct perf_data *data = &rec->data;
+ int i, ret, nr = evlist->nr_mmaps;
+
+ ret = perf_data__create_dir(data, nr);
+ if (ret)
+ return ret;
+
+ for (i = 0; i < nr; i++) {
+ struct perf_mmap *map = &evlist->mmap[i];
+
+ map->file = &data->dir.files[i];
+ }
+
+ return 0;
+}
+
static int record__mmap(struct record *rec)
{
return record__mmap_evlist(rec, rec->evlist);
@@ -793,8 +825,12 @@ static int record__mmap_read_evlist(struct record *rec, struct perf_evlist *evli
/*
* Mark the round finished in case we wrote
* at least one event.
+ *
+ * No need for round events in directory mode,
+ * because per-cpu files/maps have sorted data
+ * from kernel.
*/
- if (bytes_written != rec->bytes_written)
+ if (!perf_data__is_dir(&rec->data) && bytes_written != rec->bytes_written)
rc = record__write(rec, NULL, &finished_round_event, sizeof(finished_round_event));

if (overwrite)
@@ -837,7 +873,8 @@ static void record__init_features(struct record *rec)
if (!(rec->opts.use_clockid && rec->opts.clockid_res_ns))
perf_header__clear_feat(&session->header, HEADER_CLOCKID);

- perf_header__clear_feat(&session->header, HEADER_DIR_FORMAT);
+ if (!perf_data__is_dir(session->data))
+ perf_header__clear_feat(&session->header, HEADER_DIR_FORMAT);

perf_header__clear_feat(&session->header, HEADER_STAT);
}
@@ -851,9 +888,11 @@ record__finish_output(struct record *rec)
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 (perf_data__is_dir(data))
+ perf_data__update_dir(data);
+
if (!rec->no_buildid) {
process_buildids(rec);

@@ -924,6 +963,12 @@ record__switch_output(struct record *rec, bool at_exit)

/* Output tracking events */
if (!at_exit) {
+ if (perf_data__is_dir(data)) {
+ err = record__mmap_dir_data(rec);
+ if (err)
+ return -1;
+ }
+
record__synthesize(rec, false);

/*
@@ -1173,11 +1218,23 @@ static int __cmd_record(struct record *rec, int argc, const char **argv)
if (data->is_pipe && rec->evlist->nr_entries == 1)
rec->opts.sample_id = true;

+ if (data->is_pipe && perf_data__is_dir(data)) {
+ pr_err("Directory output is not allowed for pipe output\n");
+ err = -1;
+ goto out_child;
+ }
+
if (record__open(rec) != 0) {
err = -1;
goto out_child;
}

+ if (perf_data__is_dir(data)) {
+ err = record__mmap_dir_data(rec);
+ if (err)
+ goto out_child;
+ }
+
err = bpf__apply_obj_config();
if (err) {
char errbuf[BUFSIZ];
@@ -1983,6 +2040,8 @@ static struct option __record_options[] = {
OPT_CALLBACK(0, "affinity", &record.opts, "node|cpu",
"Set affinity mask of trace reading thread to NUMA node cpu mask or cpu of processed mmap buffer",
record__parse_affinity),
+ OPT_BOOLEAN(0, "dir", &record.data.is_dir,
+ "Store data into directory perf.data"),
OPT_END()
};

@@ -2134,6 +2193,17 @@ int cmd_record(int argc, const char **argv)
goto out;
}

+ if (perf_data__is_dir(&rec->data)) {
+ if (!rec->opts.sample_time) {
+ pr_err("Sample timestamp is required for indexing\n");
+ goto out;
+ }
+ if (record__aio_enabled(rec)) {
+ pr_err("Cannot use both --dir and --aio yet.\n");
+ goto out;
+ }
+ }
+
if (rec->opts.target.tid && !rec->opts.no_inherit_set)
rec->opts.no_inherit = true;

diff --git a/tools/perf/util/mmap.h b/tools/perf/util/mmap.h
index e566c19b242b..3e8595a8d6ce 100644
--- a/tools/perf/util/mmap.h
+++ b/tools/perf/util/mmap.h
@@ -19,17 +19,18 @@ struct aiocb;
* @refcnt - e.g. code using PERF_EVENT_IOC_SET_OUTPUT to share this
*/
struct perf_mmap {
- void *base;
- int mask;
- int fd;
- int cpu;
- refcount_t refcnt;
- u64 prev;
- u64 start;
- u64 end;
- bool overwrite;
- struct auxtrace_mmap auxtrace_mmap;
- char event_copy[PERF_SAMPLE_MAX_SIZE] __aligned(8);
+ void *base;
+ int mask;
+ int fd;
+ int cpu;
+ refcount_t refcnt;
+ u64 prev;
+ u64 start;
+ u64 end;
+ bool overwrite;
+ struct auxtrace_mmap auxtrace_mmap;
+ struct perf_data_file *file;
+ char event_copy[PERF_SAMPLE_MAX_SIZE] __aligned(8);
#ifdef HAVE_AIO_SUPPORT
struct {
void **data;
--
2.17.2
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