From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758292AbdJMOJt (ORCPT ); Fri, 13 Oct 2017 10:09:49 -0400 Received: from mga07.intel.com ([134.134.136.100]:60976 "EHLO mga07.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758259AbdJMOJo (ORCPT ); Fri, 13 Oct 2017 10:09:44 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.43,371,1503385200"; d="scan'208";a="162324928" From: kan.liang@intel.com To: acme@kernel.org, peterz@infradead.org, mingo@redhat.com, linux-kernel@vger.kernel.org Cc: 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 4/4] perf record: add option to set the number of thread for event synthesize Date: Fri, 13 Oct 2017 07:09:27 -0700 Message-Id: <1507903767-293944-5-git-send-email-kan.liang@intel.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1507903767-293944-1-git-send-email-kan.liang@intel.com> References: <1507903767-293944-1-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 | 13 +++++++++++-- 2 files changed, 15 insertions(+), 2 deletions(-) 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 1978021..98bb547 100644 --- a/tools/perf/builtin-record.c +++ b/tools/perf/builtin-record.c @@ -86,6 +86,7 @@ struct record { struct switch_output switch_output; unsigned long long samples; struct synthesize_buf *buf; + unsigned int nr_threads_synthesize; }; static volatile int auxtrace_record__snapshot_started; @@ -722,7 +723,12 @@ static int record__multithread_synthesize(struct record *rec, struct perf_tool *tool, struct record_opts *opts) { - int i, err, nr_thread = sysconf(_SC_NPROCESSORS_ONLN); + int i, err, nr_thread; + + if (rec->nr_threads_synthesize == UINT_MAX) + nr_thread = sysconf(_SC_NPROCESSORS_ONLN); + else + nr_thread = rec->nr_threads_synthesize; if (nr_thread > 1) { perf_set_multithreaded(); @@ -836,7 +842,7 @@ static int record__synthesize(struct record *rec, bool tail) } /* multithreading synthesize is only available for cpu monitoring */ - if (target__has_cpu(&opts->target)) + if (target__has_cpu(&opts->target) && (rec->nr_threads_synthesize > 1)) err = record__multithread_synthesize(rec, machine, tool, opts); else err = __machine__synthesize_threads(machine, tool, @@ -1521,6 +1527,7 @@ 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 @@ -1662,6 +1669,8 @@ 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