From: Kan Liang <[email protected]> Using UINT_MAX to indicate the default thread#, which is the number of online CPU.
Signed-off-by: Kan Liang <[email protected]> --- tools/perf/Documentation/perf-record.txt | 4 ++++ tools/perf/builtin-record.c | 10 +++++++++- 2 files changed, 13 insertions(+), 1 deletion(-) diff --git a/tools/perf/Documentation/perf-record.txt b/tools/perf/Documentation/perf-record.txt index 68a1ffb..f759dc4 100644 --- a/tools/perf/Documentation/perf-record.txt +++ b/tools/perf/Documentation/perf-record.txt @@ -483,6 +483,10 @@ config terms. For example: 'cycles/overwrite/' and 'instructions/no-overwrite/'. Implies --tail-synthesize. +--num-thread-synthesize:: +The number of threads to run event synthesize. +By default, the number of threads equals to the online CPU number. + SEE ALSO -------- linkperf:perf-stat[1], linkperf:perf-list[1] diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c index 283fc21..4b65ebd 100644 --- a/tools/perf/builtin-record.c +++ b/tools/perf/builtin-record.c @@ -82,6 +82,7 @@ struct record { struct switch_output switch_output; unsigned long long samples; struct perf_data_file *synthesized_file; + unsigned int nr_threads_synthesize; }; static volatile int auxtrace_record__snapshot_started; @@ -707,10 +708,14 @@ static int record__multithread_synthesize(struct record *rec, struct perf_tool *tool, struct record_opts *opts) { - int i, j, err, nr_thread = sysconf(_SC_NPROCESSORS_ONLN); + int i, j, err, nr_thread; int fd_from, fd_to; struct stat st; + if (rec->nr_threads_synthesize == UINT_MAX) + nr_thread = sysconf(_SC_NPROCESSORS_ONLN); + else + nr_thread = rec->nr_threads_synthesize; again: /* multithreading synthesize is only available for cpu monitoring */ if (target__has_task(&opts->target) || (nr_thread <= 1)) @@ -1530,6 +1535,7 @@ static struct record record = { .mmap2 = perf_event__process_mmap2, .ordered_events = true, }, + .nr_threads_synthesize = UINT_MAX, }; const char record_callchain_help[] = CALLCHAIN_RECORD_HELP @@ -1671,6 +1677,8 @@ static struct option __record_options[] = { "signal"), OPT_BOOLEAN(0, "dry-run", &dry_run, "Parse options then exit"), + OPT_UINTEGER(0, "num-thread-synthesize", &record.nr_threads_synthesize, + "number of thread to run event synthesize"), OPT_END() }; -- 2.7.4
