Messages in this thread Patch in this message | | | From | Alexey Bayduraev <> | Subject | [PATCH v9 12/24] perf record: Introduce --threads command line option | Date | Fri, 2 Jul 2021 15:32:20 +0300 |
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Provide --threads option in perf record command line interface. The option creates a data streaming thread for each cpu in the system. Document --threads option in Documentation/perf-record.txt.
Signed-off-by: Alexey Bayduraev <alexey.v.bayduraev@linux.intel.com> --- tools/perf/Documentation/perf-record.txt | 4 +++ tools/perf/builtin-record.c | 44 +++++++++++++++++++++++- 2 files changed, 47 insertions(+), 1 deletion(-)
diff --git a/tools/perf/Documentation/perf-record.txt b/tools/perf/Documentation/perf-record.txt index d71bac847936..ca2771b80fd5 100644 --- a/tools/perf/Documentation/perf-record.txt +++ b/tools/perf/Documentation/perf-record.txt @@ -695,6 +695,10 @@ measurements: wait -n ${perf_pid} exit $? +--threads:: +Write collected trace data into several data files using parallel threads. +The option creates a data streaming thread for each cpu in the system. + include::intel-hybrid.txt[] SEE ALSO diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c index ba3f60f7882a..9a34ec45ce2c 100644 --- a/tools/perf/builtin-record.c +++ b/tools/perf/builtin-record.c @@ -122,6 +122,11 @@ static const char *thread_msg_tags[THREAD_MSG__MAX] = { "UNDEFINED", "READY" }; +enum thread_spec { + THREAD_SPEC__UNDEFINED = 0, + THREAD_SPEC__CPU, +}; + struct record { struct perf_tool tool; struct record_opts opts; @@ -2809,6 +2814,16 @@ static void record__thread_mask_free(struct thread_mask *mask) record__mmap_cpu_mask_free(&mask->affinity); } +static int record__parse_threads(const struct option *opt, const char *str, int unset) +{ + struct record_opts *opts = opt->value; + + if (unset || !str || !strlen(str)) + opts->threads_spec = THREAD_SPEC__CPU; + + return 0; +} + static int parse_output_max_size(const struct option *opt, const char *str, int unset) { @@ -3252,6 +3267,9 @@ static struct option __record_options[] = { "\t\t\t Optionally send control command completion ('ack\\n') to ack-fd descriptor.\n" "\t\t\t Alternatively, ctl-fifo / ack-fifo will be opened and used as ctl-fd / ack-fd.", parse_control_option), + OPT_CALLBACK_OPTARG(0, "threads", &record.opts, NULL, "spec", + "write collected trace data into several data files using parallel threads", + record__parse_threads), OPT_END() }; @@ -3301,6 +3319,27 @@ static int record__alloc_thread_masks(struct record *rec, int nr_threads, int nr return ret; } +static int record__init_thread_cpu_masks(struct record *rec, struct perf_cpu_map *cpus) +{ + int t, ret, nr_cpus = perf_cpu_map__nr(cpus); + + ret = record__alloc_thread_masks(rec, nr_cpus, cpu__max_cpu()); + if (ret) + return ret; + + rec->nr_threads = nr_cpus; + pr_debug("threads: nr_threads=%d\n", rec->nr_threads); + + for (t = 0; t < rec->nr_threads; t++) { + set_bit(cpus->map[t], rec->thread_masks[t].maps.bits); + pr_debug("thread_masks[%d]: maps mask [%d]\n", t, cpus->map[t]); + set_bit(cpus->map[t], rec->thread_masks[t].affinity.bits); + pr_debug("thread_masks[%d]: affinity mask [%d]\n", t, cpus->map[t]); + } + + return 0; +} + static int record__init_thread_default_masks(struct record *rec, struct perf_cpu_map *cpus) { int ret; @@ -3320,7 +3359,10 @@ static int record__init_thread_masks(struct record *rec) { struct perf_cpu_map *cpus = rec->evlist->core.cpus; - return record__init_thread_default_masks(rec, cpus); + if (!record__threads_enabled(rec)) + return record__init_thread_default_masks(rec, cpus); + + return record__init_thread_cpu_masks(rec, cpus); } static void record__fini_thread_masks(struct record *rec) -- 2.19.0
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