linux-kernel - [PATCH 5/7] perf/bench-futex, requeue: Add --broadcast option

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Message-Id: <20210809043301.66002-6-dave@stgolabs.net>
Date:   Sun,  8 Aug 2021 21:32:59 -0700
From:   Davidlohr Bueso <dave@...olabs.net>
To:     acme@...nel.org
Cc:     mingo@...hat.com, peterz@...radead.org, tglx@...utronix.de,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
        dave@...olabs.net, Davidlohr Bueso <dbueso@...e.de>
Subject: [PATCH 5/7] perf/bench-futex, requeue: Add --broadcast option

Such that all threads are requeued to uaddr2 in a single
futex_cmp_requeue(), unlike the default, which is 1.

Signed-off-by: Davidlohr Bueso <dbueso@...e.de>
---
 tools/perf/bench/futex-requeue.c | 4 ++++
 tools/perf/bench/futex.h         | 1 +
 2 files changed, 5 insertions(+)

diff --git a/tools/perf/bench/futex-requeue.c b/tools/perf/bench/futex-requeue.c
index 88cb7e2a6729..80f40ee92b53 100644
--- a/tools/perf/bench/futex-requeue.c
+++ b/tools/perf/bench/futex-requeue.c
@@ -52,6 +52,7 @@ static const struct option options[] = {
 	OPT_BOOLEAN( 's', "silent",   &params.silent, "Silent mode: do not display data/details"),
 	OPT_BOOLEAN( 'S', "shared",   &params.fshared, "Use shared futexes instead of private ones"),
 	OPT_BOOLEAN( 'm', "mlockall", &params.mlockall, "Lock all current and future memory"),
+	OPT_BOOLEAN( 'B', "broadcast", &params.broadcast, "Requeue all threads at once"),
 	OPT_END()
 };
 
@@ -153,6 +154,9 @@ int bench_futex_requeue(int argc, const char **argv)
 	if (params.nrequeue > params.nthreads)
 		params.nrequeue = params.nthreads;
 
+	if (params.broadcast)
+		params.nrequeue = params.nthreads;
+
 	printf("Run summary [PID %d]: Requeuing %d threads (from [%s] %p to %p), "
 	       "%d at a time.\n\n",  getpid(), params.nthreads,
 	       params.fshared ? "shared":"private", &futex1, &futex2, params.nrequeue);
diff --git a/tools/perf/bench/futex.h b/tools/perf/bench/futex.h
index 1c8fa469993f..36f158650edf 100644
--- a/tools/perf/bench/futex.h
+++ b/tools/perf/bench/futex.h
@@ -21,6 +21,7 @@ struct bench_futex_parameters {
 	bool fshared;
 	bool mlockall;
 	bool multi; /* lock-pi */
+	bool broadcast; /* requeue */
 	unsigned int runtime; /* seconds*/
 	unsigned int nthreads;
 	unsigned int nfutexes;
-- 
2.26.2