Re: [PATCH 4/7] perf/bench-futex: Add --mlockall parameter

From: Arnaldo Carvalho de Melo <acme@kernel.org>
Date: 2021-08-09 14:56:28
Also in: lkml

Em Sun, Aug 08, 2021 at 09:32:58PM -0700, Davidlohr Bueso escreveu:

This adds, across all futex benchmarks, the -m/--mlockall option
which is a common operation for realtime workloads by not incurring
in page faults in paths that want determinism. As such, threads
started after a call to mlockall(2) will generate page faults
immediately since the new stack is immediately forced to memory,
due to the MCL_FUTURE flag.

Applied.

At some point these options could be handled in a common
futex_parse_options() function that would consume argv[] and then the
specific futex benchmarks would continue from where the common function
left off.

- Arnaldo

quoted hunk ↗ jump to hunk

Signed-off-by: Davidlohr Bueso <redacted>
---
 tools/perf/bench/futex-hash.c          | 7 +++++++
 tools/perf/bench/futex-lock-pi.c       | 7 +++++++
 tools/perf/bench/futex-requeue.c       | 7 +++++++
 tools/perf/bench/futex-wake-parallel.c | 8 ++++++++
 tools/perf/bench/futex-wake.c          | 8 ++++++++
 tools/perf/bench/futex.h               | 1 +
 6 files changed, 38 insertions(+)

diff --git a/tools/perf/bench/futex-hash.c b/tools/perf/bench/futex-hash.c
index b71a34204b79..af9fbb409472 100644
--- a/tools/perf/bench/futex-hash.c
+++ b/tools/perf/bench/futex-hash.c

@@ -20,6 +20,7 @@
 #include <linux/kernel.h>
 #include <linux/zalloc.h>
 #include <sys/time.h>
+#include <sys/mman.h>
 #include <perf/cpumap.h>
 
 #include "../util/stat.h"

@@ -55,6 +56,7 @@ static const struct option options[] = {
 	OPT_UINTEGER('f', "futexes", &params.nfutexes, "Specify amount of futexes per threads"),
 	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_END()
 };

@@ -141,6 +143,11 @@ int bench_futex_hash(int argc, const char **argv)
 	act.sa_sigaction = toggle_done;
 	sigaction(SIGINT, &act, NULL);
 
+	if (params.mlockall) {
+		if (mlockall(MCL_CURRENT | MCL_FUTURE))
+			err(EXIT_FAILURE, "mlockall");
+	}
+
 	if (!params.nthreads) /* default to the number of CPUs */
 		params.nthreads = cpu->nr;

diff --git a/tools/perf/bench/futex-lock-pi.c b/tools/perf/bench/futex-lock-pi.c
index bc208edf3de3..d2927d2eb3f7 100644
--- a/tools/perf/bench/futex-lock-pi.c
+++ b/tools/perf/bench/futex-lock-pi.c

@@ -21,6 +21,7 @@
 #include <err.h>
 #include <stdlib.h>
 #include <sys/time.h>
+#include <sys/mman.h>
 
 struct worker {
 	int tid;

@@ -47,6 +48,7 @@ static const struct option options[] = {
 	OPT_BOOLEAN( 'M', "multi",   &params.multi, "Use multiple futexes"),
 	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_END()
 };

@@ -164,6 +166,11 @@ int bench_futex_lock_pi(int argc, const char **argv)
 	act.sa_sigaction = toggle_done;
 	sigaction(SIGINT, &act, NULL);
 
+	if (params.mlockall) {
+		if (mlockall(MCL_CURRENT | MCL_FUTURE))
+			err(EXIT_FAILURE, "mlockall");
+	}
+
 	if (!params.nthreads)
 		params.nthreads = cpu->nr;

diff --git a/tools/perf/bench/futex-requeue.c b/tools/perf/bench/futex-requeue.c
index 4001312122be..88cb7e2a6729 100644
--- a/tools/perf/bench/futex-requeue.c
+++ b/tools/perf/bench/futex-requeue.c

@@ -27,6 +27,7 @@
 #include <err.h>
 #include <stdlib.h>
 #include <sys/time.h>
+#include <sys/mman.h>
 
 static u_int32_t futex1 = 0, futex2 = 0;

@@ -50,6 +51,7 @@ static const struct option options[] = {
 	OPT_UINTEGER('q', "nrequeue", &params.nrequeue, "Specify amount of threads to requeue at once"),
 	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_END()
 };

@@ -133,6 +135,11 @@ int bench_futex_requeue(int argc, const char **argv)
 	act.sa_sigaction = toggle_done;
 	sigaction(SIGINT, &act, NULL);
 
+	if (params.mlockall) {
+		if (mlockall(MCL_CURRENT | MCL_FUTURE))
+			err(EXIT_FAILURE, "mlockall");
+	}
+
 	if (!params.nthreads)
 		params.nthreads = cpu->nr;

diff --git a/tools/perf/bench/futex-wake-parallel.c b/tools/perf/bench/futex-wake-parallel.c
index ea4fdea6e2f3..ef1f8237fd81 100644
--- a/tools/perf/bench/futex-wake-parallel.c
+++ b/tools/perf/bench/futex-wake-parallel.c

@@ -34,6 +34,7 @@ int bench_futex_wake_parallel(int argc __maybe_unused, const char **argv __maybe
 #include <err.h>
 #include <stdlib.h>
 #include <sys/time.h>
+#include <sys/mman.h>
 
 struct thread_data {
 	pthread_t worker;

@@ -61,6 +62,8 @@ static const struct option options[] = {
 	OPT_UINTEGER('w', "nwakers", &params.nwakes, "Specify amount of waking threads"),
 	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_END()
 };

@@ -238,6 +241,11 @@ int bench_futex_wake_parallel(int argc, const char **argv)
 	act.sa_sigaction = toggle_done;
 	sigaction(SIGINT, &act, NULL);
 
+	if (params.mlockall) {
+		if (mlockall(MCL_CURRENT | MCL_FUTURE))
+			err(EXIT_FAILURE, "mlockall");
+	}
+
 	cpu = perf_cpu_map__new(NULL);
 	if (!cpu)
 		err(EXIT_FAILURE, "calloc");

diff --git a/tools/perf/bench/futex-wake.c b/tools/perf/bench/futex-wake.c
index 1cf651c8ee5c..40e492c7996a 100644
--- a/tools/perf/bench/futex-wake.c
+++ b/tools/perf/bench/futex-wake.c

@@ -27,6 +27,7 @@
 #include <err.h>
 #include <stdlib.h>
 #include <sys/time.h>
+#include <sys/mman.h>
 
 /* all threads will block on the same futex */
 static u_int32_t futex1 = 0;

@@ -51,6 +52,8 @@ static const struct option options[] = {
 	OPT_UINTEGER('w', "nwakes",  &params.nwakes, "Specify amount of threads to wake at once"),
 	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_END()
 };

@@ -141,6 +144,11 @@ int bench_futex_wake(int argc, const char **argv)
 	act.sa_sigaction = toggle_done;
 	sigaction(SIGINT, &act, NULL);
 
+	if (params.mlockall) {
+		if (mlockall(MCL_CURRENT | MCL_FUTURE))
+			err(EXIT_FAILURE, "mlockall");
+	}
+
 	if (!params.nthreads)
 		params.nthreads = cpu->nr;

diff --git a/tools/perf/bench/futex.h b/tools/perf/bench/futex.h
index f7cd22bbd677..1c8fa469993f 100644
--- a/tools/perf/bench/futex.h
+++ b/tools/perf/bench/futex.h

@@ -19,6 +19,7 @@ static int futex_flag = 0;
 struct bench_futex_parameters {
 	bool silent;
 	bool fshared;
+	bool mlockall;
 	bool multi; /* lock-pi */
 	unsigned int runtime; /* seconds*/
 	unsigned int nthreads;

-- 
2.26.2

-- 

- Arnaldo

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