Messages in this thread | | | Subject | Re: [PATCH 14/14] perf record: Add --dir option to store data in directory | From | Alexey Budankov <> | Date | Tue, 5 Feb 2019 15:36:24 +0300 |
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On 03.02.2019 18:30, Jiri Olsa wrote: > Adding --dir option to store data in directory. It's next > step for multiple threads in record. It's not 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 > > 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 | 59 ++++++++++++++++++++++-- > tools/perf/util/mmap.h | 23 ++++----- > 3 files changed, 70 insertions(+), 15 deletions(-) > > diff --git a/tools/perf/Documentation/perf-record.txt b/tools/perf/Documentation/perf-record.txt > index d232b13ea713..8dcdc8cabcad 100644 > --- a/tools/perf/Documentation/perf-record.txt > +++ b/tools/perf/Documentation/perf-record.txt > @@ -505,6 +505,9 @@ config terms. For example: 'cycles/overwrite/' and 'instructions/no-overwrite/'. > > Implies --tail-synthesize. > > +--dir:: > +Store data into directory with one data file for cpu. > +
Makes sense to mention compatibility with -o option and per-thread buffer mapping.
> 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 cd02ab3ec4ff..87e39b9cc7bd 100644 > --- a/tools/perf/builtin-record.c > +++ b/tools/perf/builtin-record.c > @@ -111,17 +111,21 @@ 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;
For AIO mode per-cpu streaming could be done in parallel because Posix AIO API uses a separate thread for every open data.# or header fd.
> > if (perf_data_file__write(file, bf, size) < 0) { > pr_err("failed to write perf data, error: %m\n"); > return -1; > } > > - rec->bytes_written += size; > + if (file == &rec->data.file) > + rec->bytes_written += size;
switch-output logic now tracks header file size only? If so, it probably needs to be corrected or simply disabled for --output_dir mode.
Alexey
> > if (switch_output_size(rec)) > trigger_hit(&switch_output_trigger); > @@ -563,6 +567,25 @@ 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); > @@ -792,8 +815,12 @@ 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) > @@ -851,6 +878,9 @@ record__finish_output(struct record *rec) > 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); > > @@ -1170,11 +1200,23 @@ 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]; > @@ -1962,6 +2004,8 @@ static struct option __record_options[] = { > &nr_cblocks_default, "n", "Use <n> control blocks in asynchronous trace writing mode (default: 1, max: 4)", > record__aio_parse), > #endif > + OPT_BOOLEAN(0, "dir", &record.data.is_dir, > + "Store data into directory perf.data"), > OPT_END() > }; > > @@ -2113,6 +2157,13 @@ 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 (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; >
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