Commit d262e6a9 authored by Davidlohr Bueso's avatar Davidlohr Bueso Committed by Arnaldo Carvalho de Melo
Browse files

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: default avatarDavidlohr Bueso <dbueso@suse.de>
Cc: Davidlohr Bueso <dbueso@suse.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lore.kernel.org/lkml/20210809043301.66002-6-dave@stgolabs.net


Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent 9f9a3ffe

tools/perf/bench/futex-requeue.c

+4 −0
Original line number Diff line number Diff line
@@ -53,6 +53,7 @@ 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()

};
@@ -154,6 +155,9 @@ 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);

tools/perf/bench/futex.h

+1 −0
Original line number Diff line number Diff line
@@ -18,6 +18,7 @@ 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;