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perf record: Introduce --threads command line option

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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.

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>
This commit is contained in:
Alexey Bayduraev 2022-01-17 21:34:32 +03:00 committed by Arnaldo Carvalho de Melo
parent 610fbc0165
commit 06380a849f
2 changed files with 51 additions and 1 deletions
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4
tools/perf/Documentation/perf-record.txt
View file

@ -713,6 +713,10 @@ 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[]
--debuginfod[=URLs]::

48
tools/perf/builtin-record.c
View file

@ -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 @@ 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().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)