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Subject[patch 6/7] perf/bench/futex-hash: Support NUMA
This adds a new option to tell perf on which numa node the hash benchmark
should run. If set then

- The test is bound to the node
- Memory is allocated on the local NUMA node
- The threads are bound to the cpus on the node

The NUMA node can be specified by the -n argument.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
tools/perf/bench/Build | 4 ++
tools/perf/bench/futex-hash.c | 89 +++++++++++++++++++++++++++++++++++++------
2 files changed, 82 insertions(+), 11 deletions(-)

diff --git a/tools/perf/bench/Build b/tools/perf/bench/Build
index 60bf119..9e6e518 100644
--- a/tools/perf/bench/Build
+++ b/tools/perf/bench/Build
@@ -1,3 +1,7 @@
+ifdef CONFIG_NUMA
+CFLAGS_futex-hash.o += -DCONFIG_NUMA=1
+endif
+
perf-y += sched-messaging.o
perf-y += sched-pipe.o
perf-y += mem-functions.o
diff --git a/tools/perf/bench/futex-hash.c b/tools/perf/bench/futex-hash.c
index 0999ac5..a1c6ee9 100644
--- a/tools/perf/bench/futex-hash.c
+++ b/tools/perf/bench/futex-hash.c
@@ -20,6 +20,9 @@
#include <stdlib.h>
#include <sys/time.h>
#include <pthread.h>
+#ifdef CONFIG_NUMA
+#include <numa.h>
+#endif

static unsigned int nthreads = 0;
static unsigned int nsecs = 10;
@@ -27,6 +30,7 @@ static unsigned int nsecs = 10;
static unsigned int nfutexes = 1024;
static bool fshared = false, done = false, silent = false;
static int futex_flag = 0;
+static int numa_node = -1;

struct timeval start, end, runtime;
static pthread_mutex_t thread_lock;
@@ -39,7 +43,7 @@ struct worker {
u_int32_t *futex;
pthread_t thread;
unsigned long ops;
-};
+} __attribute__((aligned(128)));

static const struct option options[] = {
OPT_UINTEGER('t', "threads", &nthreads, "Specify amount of threads"),
@@ -47,9 +51,28 @@ static const struct option options[] = {
OPT_UINTEGER('f', "futexes", &nfutexes, "Specify amount of futexes per threads"),
OPT_BOOLEAN( 's', "silent", &silent, "Silent mode: do not display data/details"),
OPT_BOOLEAN( 'S', "shared", &fshared, "Use shared futexes instead of private ones"),
+#ifdef CONFIG_NUMA
+ OPT_INTEGER( 'n', "numa", &numa_node, "Specify the NUMA node"),
+#endif
OPT_END()
};

+#ifndef CONFIG_NUMA
+static int numa_run_on_node(int node __maybe_unused) { return 0; }
+static int numa_node_of_cpu(int node __maybe_unused) { return 0; }
+static void *numa_alloc_local(size_t size) { return malloc(size); }
+static void numa_free(void *p, size_t size __maybe_unused) { return free(p); }
+#endif
+
+static bool cpu_is_local(int cpu)
+{
+ if (numa_node < 0)
+ return true;
+ if (numa_node_of_cpu(cpu) == numa_node)
+ return true;
+ return false;
+}
+
static const char * const bench_futex_hash_usage[] = {
"perf bench futex hash <options>",
NULL
@@ -115,6 +138,8 @@ int bench_futex_hash(int argc, const char **argv,
unsigned int i, ncpus;
pthread_attr_t thread_attr;
struct worker *worker = NULL;
+ char *node_str = NULL;
+ unsigned int cpunum;

argc = parse_options(argc, argv, options, bench_futex_hash_usage, 0);
if (argc) {
@@ -128,18 +153,50 @@ int bench_futex_hash(int argc, const char **argv,
act.sa_sigaction = toggle_done;
sigaction(SIGINT, &act, NULL);

- if (!nthreads) /* default to the number of CPUs */
- nthreads = ncpus;
+ if (!nthreads) {
+ /* default to the number of CPUs per NUMA node */
+ if (numa_node < 0) {
+ nthreads = ncpus;
+ } else {
+ for (i = 0; i < ncpus; i++) {
+ if (cpu_is_local(i))
+ nthreads++;
+ }
+ if (!nthreads)
+ err(EXIT_FAILURE, "No online CPUs for this node");
+ }
+ } else {
+ int cpu_available = 0;
+
+ for (i = 0; i < ncpus && !cpu_available; i++) {
+ if (cpu_is_local(i))
+ cpu_available = 1;
+ }
+ if (!cpu_available)
+ err(EXIT_FAILURE, "No online CPUs for this node");
+ }
+
+ if (numa_node >= 0) {
+ ret = numa_run_on_node(numa_node);
+ if (ret < 0)
+ err(EXIT_FAILURE, "numa_run_on_node");
+ ret = asprintf(&node_str, " on node %d", numa_node);
+ if (ret < 0)
+ err(EXIT_FAILURE, "numa_node, asprintf");
+ }

- worker = calloc(nthreads, sizeof(*worker));
+ worker = numa_alloc_local(nthreads * sizeof(*worker));
if (!worker)
goto errmem;

if (!fshared)
futex_flag = FUTEX_PRIVATE_FLAG;

- printf("Run summary [PID %d]: %d threads, each operating on %d [%s] futexes for %d secs.\n\n",
- getpid(), nthreads, nfutexes, fshared ? "shared":"private", nsecs);
+ printf("Run summary [PID %d]: %d threads%s, each operating on %d [%s] futexes for %d secs.\n\n",
+ getpid(), nthreads,
+ node_str ? : "",
+ nfutexes, fshared ? "shared":"private",
+ nsecs);

init_stats(&throughput_stats);
pthread_mutex_init(&thread_lock, NULL);
@@ -149,14 +206,24 @@ int bench_futex_hash(int argc, const char **argv,
threads_starting = nthreads;
pthread_attr_init(&thread_attr);
gettimeofday(&start, NULL);
- for (i = 0; i < nthreads; i++) {
+ for (cpunum = 0, i = 0; i < nthreads; i++, cpunum++) {
+
+ do {
+ if (cpu_is_local(cpunum))
+ break;
+ cpunum++;
+ if (cpunum > ncpus)
+ cpunum = 0;
+ } while (1);
+
worker[i].tid = i;
- worker[i].futex = calloc(nfutexes, sizeof(*worker[i].futex));
+ worker[i].futex = numa_alloc_local(nfutexes *
+ sizeof(*worker[i].futex));
if (!worker[i].futex)
goto errmem;

CPU_ZERO(&cpu);
- CPU_SET(i % ncpus, &cpu);
+ CPU_SET(cpunum % ncpus, &cpu);

ret = pthread_attr_setaffinity_np(&thread_attr, sizeof(cpu_set_t), &cpu);
if (ret)
@@ -203,12 +270,12 @@ int bench_futex_hash(int argc, const char **argv,
&worker[i].futex[nfutexes-1], t);
}

- free(worker[i].futex);
+ numa_free(worker[i].futex, nfutexes * sizeof(*worker[i].futex));
}

print_summary();

- free(worker);
+ numa_free(worker, nthreads * sizeof(*worker));
return ret;
errmem:
err(EXIT_FAILURE, "calloc");
--
2.1.4


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