From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753360AbdJTUKg (ORCPT ); Fri, 20 Oct 2017 16:10:36 -0400 Received: from mga05.intel.com ([192.55.52.43]:4477 "EHLO mga05.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752346AbdJTUKV (ORCPT ); Fri, 20 Oct 2017 16:10:21 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.43,408,1503385200"; d="scan'208";a="325761705" From: kan.liang@intel.com To: acme@kernel.org, mingo@redhat.com, linux-kernel@vger.kernel.org Cc: peterz@infradead.org, jolsa@kernel.org, wangnan0@huawei.com, hekuang@huawei.com, namhyung@kernel.org, alexander.shishkin@linux.intel.com, adrian.hunter@intel.com, ak@linux.intel.com, Kan Liang Subject: [PATCH V3 6/6] perf record: add option to set the number of thread for event synthesize Date: Fri, 20 Oct 2017 13:05:34 -0700 Message-Id: <1508529934-369393-7-git-send-email-kan.liang@intel.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1508529934-369393-1-git-send-email-kan.liang@intel.com> References: <1508529934-369393-1-git-send-email-kan.liang@intel.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Kan Liang Using UINT_MAX to indicate the default thread#, which is the number of online CPU. Signed-off-by: Kan Liang --- 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