perf record: Introduce --threads command line option
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. Reviewed-by: Riccardo Mancini <rickyman7@gmail.com> Signed-off-by: Alexey Bayduraev <alexey.v.bayduraev@linux.intel.com> Tested-by: Jiri Olsa <jolsa@kernel.org> Tested-by: Riccardo Mancini <rickyman7@gmail.com> Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Alexander Antonov <alexander.antonov@linux.intel.com> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Alexei Budankov <abudankov@huawei.com> Cc: Andi Kleen <ak@linux.intel.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Link: https://lore.kernel.org/r/01aeae43b047f428596c4ef9f9342ab94865cedd.1642440724.git.alexey.v.bayduraev@linux.intel.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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@ -713,6 +713,10 @@ measurements:
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wait -n ${perf_pid}
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exit $?
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--threads::
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Write collected trace data into several data files using parallel threads.
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The option creates a data streaming thread for each CPU in the system.
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include::intel-hybrid.txt[]
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--debuginfod[=URLs]::
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@ -127,6 +127,11 @@ static const char *thread_msg_tags[THREAD_MSG__MAX] = {
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"UNDEFINED", "READY"
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};
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enum thread_spec {
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THREAD_SPEC__UNDEFINED = 0,
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THREAD_SPEC__CPU,
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};
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struct record {
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struct perf_tool tool;
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struct record_opts opts;
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@ -2768,6 +2773,16 @@ static void record__thread_mask_free(struct thread_mask *mask)
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record__mmap_cpu_mask_free(&mask->affinity);
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}
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static int record__parse_threads(const struct option *opt, const char *str, int unset)
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{
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struct record_opts *opts = opt->value;
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if (unset || !str || !strlen(str))
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opts->threads_spec = THREAD_SPEC__CPU;
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return 0;
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}
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static int parse_output_max_size(const struct option *opt,
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const char *str, int unset)
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{
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@ -3242,6 +3257,9 @@ static struct option __record_options[] = {
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&record.debuginfod.set, "debuginfod urls",
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"Enable debuginfod data retrieval from DEBUGINFOD_URLS or specified urls",
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"system"),
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OPT_CALLBACK_OPTARG(0, "threads", &record.opts, NULL, "spec",
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"write collected trace data into several data files using parallel threads",
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record__parse_threads),
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OPT_END()
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};
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@ -3292,6 +3310,31 @@ out_free:
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return ret;
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}
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static int record__init_thread_cpu_masks(struct record *rec, struct perf_cpu_map *cpus)
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{
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int t, ret, nr_cpus = perf_cpu_map__nr(cpus);
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ret = record__alloc_thread_masks(rec, nr_cpus, cpu__max_cpu().cpu);
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if (ret)
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return ret;
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rec->nr_threads = nr_cpus;
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pr_debug("nr_threads: %d\n", rec->nr_threads);
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for (t = 0; t < rec->nr_threads; t++) {
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set_bit(cpus->map[t].cpu, rec->thread_masks[t].maps.bits);
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set_bit(cpus->map[t].cpu, rec->thread_masks[t].affinity.bits);
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if (verbose) {
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pr_debug("thread_masks[%d]: ", t);
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mmap_cpu_mask__scnprintf(&rec->thread_masks[t].maps, "maps");
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pr_debug("thread_masks[%d]: ", t);
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mmap_cpu_mask__scnprintf(&rec->thread_masks[t].affinity, "affinity");
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}
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}
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return 0;
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}
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static int record__init_thread_default_masks(struct record *rec, struct perf_cpu_map *cpus)
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{
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int ret;
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@ -3311,7 +3354,10 @@ static int record__init_thread_masks(struct record *rec)
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{
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struct perf_cpu_map *cpus = rec->evlist->core.cpus;
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return record__init_thread_default_masks(rec, cpus);
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if (!record__threads_enabled(rec))
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return record__init_thread_default_masks(rec, cpus);
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return record__init_thread_cpu_masks(rec, cpus);
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}
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int cmd_record(int argc, const char **argv)
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