[RFC PATCH v3 13/15] perf top: setup global workqueue
From: Riccardo Mancini <hidden>
Date: 2021-08-20 10:55:12
Also in:
lkml
Subsystem:
performance events subsystem, the rest · Maintainers:
Peter Zijlstra, Ingo Molnar, Arnaldo Carvalho de Melo, Namhyung Kim, Linus Torvalds
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 <redacted> --- 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