Messages in this thread Patch in this message | | | Subject | [PATCH v2 08/15] perf record: write trace data into mmap trace files | From | Alexey Budankov <> | Date | Wed, 21 Oct 2020 19:02:56 +0300 |
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Write trace buffer data into per mmap trace files located at data directory. Streaming thread adjusts its affinity according to mask of the buffer being processed.
Signed-off-by: Alexey Budankov <alexey.budankov@linux.intel.com> --- tools/perf/builtin-record.c | 44 ++++++++++++++++++++++++++++++++----- tools/perf/util/record.h | 1 + 2 files changed, 39 insertions(+), 6 deletions(-)
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c index 619aaee11231..ba26d75c51d6 100644 --- a/tools/perf/builtin-record.c +++ b/tools/perf/builtin-record.c @@ -120,6 +120,11 @@ static const char *affinity_tags[PERF_AFFINITY_MAX] = { "SYS", "NODE", "CPU" }; +static int record__threads_enabled(struct record *rec) +{ + return rec->opts.threads; +} + static bool switch_output_signal(struct record *rec) { return rec->switch_output.signal && @@ -894,6 +899,20 @@ static int record__mmap_evlist(struct record *rec, return -EINVAL; } } + + if (record__threads_enabled(rec)) { + int i, ret, nr = evlist->core.nr_mmaps; + struct mmap *mmaps = rec->opts.overwrite ? + evlist->overwrite_mmap : evlist->mmap; + + ret = perf_data__create_dir(&rec->data, evlist->core.nr_mmaps); + if (ret) + return ret; + + for (i = 0; i < nr; i++) + mmaps[i].file = &rec->data.dir.files[i]; + } + return 0; } @@ -1184,8 +1203,12 @@ 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) @@ -1231,7 +1254,9 @@ 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); @@ -1242,15 +1267,21 @@ 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) @@ -2041,8 +2072,6 @@ 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) { @@ -2680,9 +2709,12 @@ int cmd_record(int argc, const char **argv) } - if (rec->opts.kcore) + if (rec->opts.kcore || record__threads_enabled(rec)) rec->data.is_dir = true; + if (record__threads_enabled(rec)) + rec->opts.affinity = PERF_AFFINITY_CPU; + if (rec->opts.comp_level != 0) { pr_debug("Compression enabled, disabling build id collection at the end of the session.\n"); rec->no_buildid = true; diff --git a/tools/perf/util/record.h b/tools/perf/util/record.h index 266760ac9143..aeda3cdaa3e9 100644 --- a/tools/perf/util/record.h +++ b/tools/perf/util/record.h @@ -74,6 +74,7 @@ struct record_opts { int ctl_fd; int ctl_fd_ack; bool ctl_fd_close; + bool threads; }; extern const char * const *record_usage; -- 2.24.1
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