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author | Alexey Bayduraev <alexey.v.bayduraev@linux.intel.com> | 2022-01-17 21:34:32 +0300 |
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committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2022-02-10 16:26:48 -0300 |
commit | 06380a849fa89da33d309597890ef26d24095b41 (patch) | |
tree | 8e2d0b57370f99fb7f007684b7c0cff0ab03a89b /tools/perf/builtin-record.c | |
parent | perf record: Introduce data transferred and compressed stats (diff) | |
download | linux-06380a849fa89da33d309597890ef26d24095b41.tar.gz linux-06380a849fa89da33d309597890ef26d24095b41.tar.bz2 linux-06380a849fa89da33d309597890ef26d24095b41.zip |
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>
Diffstat (limited to 'tools/perf/builtin-record.c')
-rw-r--r-- | tools/perf/builtin-record.c | 48 |
1 files changed, 47 insertions, 1 deletions
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c index d19d0639c3f1..aea45f3cc66c 100644 --- a/tools/perf/builtin-record.c +++ b/tools/perf/builtin-record.c @@ -127,6 +127,11 @@ 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; @@ -2768,6 +2773,16 @@ 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) { @@ -3242,6 +3257,9 @@ static struct option __record_options[] = { &record.debuginfod.set, "debuginfod urls", "Enable debuginfod data retrieval from DEBUGINFOD_URLS or specified urls", "system"), + 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() }; @@ -3292,6 +3310,31 @@ out_free: 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().cpu); + if (ret) + return ret; + + rec->nr_threads = nr_cpus; + pr_debug("nr_threads: %d\n", rec->nr_threads); + + for (t = 0; t < rec->nr_threads; t++) { + set_bit(cpus->map[t].cpu, rec->thread_masks[t].maps.bits); + set_bit(cpus->map[t].cpu, rec->thread_masks[t].affinity.bits); + if (verbose) { + pr_debug("thread_masks[%d]: ", t); + mmap_cpu_mask__scnprintf(&rec->thread_masks[t].maps, "maps"); + pr_debug("thread_masks[%d]: ", t); + mmap_cpu_mask__scnprintf(&rec->thread_masks[t].affinity, "affinity"); + } + } + + return 0; +} + static int record__init_thread_default_masks(struct record *rec, struct perf_cpu_map *cpus) { int ret; @@ -3311,7 +3354,10 @@ 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); } int cmd_record(int argc, const char **argv) |