linux-kernel - [RFC PATCH v3 13/15] perf top: setup global workqueue

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Message-Id: <331e87d881040594673af3399a8b925442fa46d2.1629454773.git.rickyman7@gmail.com>
Date:   Fri, 20 Aug 2021 12:53:59 +0200
From:   Riccardo Mancini <rickyman7@...il.com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Ian Rogers <irogers@...gle.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Jiri Olsa <jolsa@...hat.com>, linux-kernel@...r.kernel.org,
        linux-perf-users@...r.kernel.org,
        Alexey Bayduraev <alexey.v.bayduraev@...ux.intel.com>,
        Riccardo Mancini <rickyman7@...il.com>
Subject: [RFC PATCH v3 13/15] perf top: setup global workqueue

This patch initializes the global workqueue in perf-top if
nr_threads_synthesize is set.

This patch is a preparation for using the global_workqueue in
synthesize.

Signed-off-by: Riccardo Mancini <rickyman7@...il.com>
---
 tools/perf/builtin-top.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
index a3ae9176a83e2453..9b4f220920780a95 100644
--- a/tools/perf/builtin-top.c
+++ b/tools/perf/builtin-top.c
@@ -49,6 +49,7 @@
 #include "util/term.h"
 #include "util/intlist.h"
 #include "util/parse-branch-options.h"
+#include "util/workqueue/workqueue.h"
 #include "arch/common.h"
 #include "ui/ui.h"
 
@@ -1767,8 +1768,23 @@ int cmd_top(int argc, const char **argv)
 		opts->no_bpf_event = true;
 	}
 
+	if (top.nr_threads_synthesize == UINT_MAX)
+		top.nr_threads_synthesize = sysconf(_SC_NPROCESSORS_ONLN);
+	if (top.nr_threads_synthesize > 1) {
+		status = setup_global_workqueue(top.nr_threads_synthesize);
+		if (status) {
+			create_workqueue_strerror(global_wq, errbuf, sizeof(errbuf));
+			pr_err("setup_global_workqueue: %s\n", errbuf);
+			goto out_stop_sb_th;
+		}
+	}
+
 	status = __cmd_top(&top);
 
+	if (top.nr_threads_synthesize > 1)
+		teardown_global_workqueue();
+
+out_stop_sb_th:
 	if (!opts->no_bpf_event)
 		evlist__stop_sb_thread(top.sb_evlist);
 
-- 
2.31.1