mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-15 03:26:47 +07:00
86c87e13f8
Unlike futex-hash, requeuing and wakeup benchmarks do not support shared futexes, limiting the usefulness of the programs. Correct this, and allow using the local -S parameter. The default remains using private futexes. Signed-off-by: Davidlohr Bueso <dbueso@suse.de> Cc: Davidlohr Bueso <dbueso@suse.de> Link: http://lkml.kernel.org/r/1412008868-22328-1-git-send-email-dave@stgolabs.net Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
216 lines
5.7 KiB
C
216 lines
5.7 KiB
C
/*
|
|
* Copyright (C) 2013 Davidlohr Bueso <davidlohr@hp.com>
|
|
*
|
|
* futex-hash: Stress the hell out of the Linux kernel futex uaddr hashing.
|
|
*
|
|
* This program is particularly useful for measuring the kernel's futex hash
|
|
* table/function implementation. In order for it to make sense, use with as
|
|
* many threads and futexes as possible.
|
|
*/
|
|
|
|
#include "../perf.h"
|
|
#include "../util/util.h"
|
|
#include "../util/stat.h"
|
|
#include "../util/parse-options.h"
|
|
#include "../util/header.h"
|
|
#include "bench.h"
|
|
#include "futex.h"
|
|
|
|
#include <err.h>
|
|
#include <stdlib.h>
|
|
#include <sys/time.h>
|
|
#include <pthread.h>
|
|
|
|
static unsigned int nthreads = 0;
|
|
static unsigned int nsecs = 10;
|
|
/* amount of futexes per thread */
|
|
static unsigned int nfutexes = 1024;
|
|
static bool fshared = false, done = false, silent = false;
|
|
static int futex_flag = 0;
|
|
|
|
struct timeval start, end, runtime;
|
|
static pthread_mutex_t thread_lock;
|
|
static unsigned int threads_starting;
|
|
static struct stats throughput_stats;
|
|
static pthread_cond_t thread_parent, thread_worker;
|
|
|
|
struct worker {
|
|
int tid;
|
|
u_int32_t *futex;
|
|
pthread_t thread;
|
|
unsigned long ops;
|
|
};
|
|
|
|
static const struct option options[] = {
|
|
OPT_UINTEGER('t', "threads", &nthreads, "Specify amount of threads"),
|
|
OPT_UINTEGER('r', "runtime", &nsecs, "Specify runtime (in seconds)"),
|
|
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"),
|
|
OPT_END()
|
|
};
|
|
|
|
static const char * const bench_futex_hash_usage[] = {
|
|
"perf bench futex hash <options>",
|
|
NULL
|
|
};
|
|
|
|
static void *workerfn(void *arg)
|
|
{
|
|
int ret;
|
|
unsigned int i;
|
|
struct worker *w = (struct worker *) arg;
|
|
|
|
pthread_mutex_lock(&thread_lock);
|
|
threads_starting--;
|
|
if (!threads_starting)
|
|
pthread_cond_signal(&thread_parent);
|
|
pthread_cond_wait(&thread_worker, &thread_lock);
|
|
pthread_mutex_unlock(&thread_lock);
|
|
|
|
do {
|
|
for (i = 0; i < nfutexes; i++, w->ops++) {
|
|
/*
|
|
* We want the futex calls to fail in order to stress
|
|
* the hashing of uaddr and not measure other steps,
|
|
* such as internal waitqueue handling, thus enlarging
|
|
* the critical region protected by hb->lock.
|
|
*/
|
|
ret = futex_wait(&w->futex[i], 1234, NULL, futex_flag);
|
|
if (!silent &&
|
|
(!ret || errno != EAGAIN || errno != EWOULDBLOCK))
|
|
warn("Non-expected futex return call");
|
|
}
|
|
} while (!done);
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static void toggle_done(int sig __maybe_unused,
|
|
siginfo_t *info __maybe_unused,
|
|
void *uc __maybe_unused)
|
|
{
|
|
/* inform all threads that we're done for the day */
|
|
done = true;
|
|
gettimeofday(&end, NULL);
|
|
timersub(&end, &start, &runtime);
|
|
}
|
|
|
|
static void print_summary(void)
|
|
{
|
|
unsigned long avg = avg_stats(&throughput_stats);
|
|
double stddev = stddev_stats(&throughput_stats);
|
|
|
|
printf("%sAveraged %ld operations/sec (+- %.2f%%), total secs = %d\n",
|
|
!silent ? "\n" : "", avg, rel_stddev_stats(stddev, avg),
|
|
(int) runtime.tv_sec);
|
|
}
|
|
|
|
int bench_futex_hash(int argc, const char **argv,
|
|
const char *prefix __maybe_unused)
|
|
{
|
|
int ret = 0;
|
|
cpu_set_t cpu;
|
|
struct sigaction act;
|
|
unsigned int i, ncpus;
|
|
pthread_attr_t thread_attr;
|
|
struct worker *worker = NULL;
|
|
|
|
argc = parse_options(argc, argv, options, bench_futex_hash_usage, 0);
|
|
if (argc) {
|
|
usage_with_options(bench_futex_hash_usage, options);
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
|
|
ncpus = sysconf(_SC_NPROCESSORS_ONLN);
|
|
|
|
sigfillset(&act.sa_mask);
|
|
act.sa_sigaction = toggle_done;
|
|
sigaction(SIGINT, &act, NULL);
|
|
|
|
if (!nthreads) /* default to the number of CPUs */
|
|
nthreads = ncpus;
|
|
|
|
worker = calloc(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);
|
|
|
|
init_stats(&throughput_stats);
|
|
pthread_mutex_init(&thread_lock, NULL);
|
|
pthread_cond_init(&thread_parent, NULL);
|
|
pthread_cond_init(&thread_worker, NULL);
|
|
|
|
threads_starting = nthreads;
|
|
pthread_attr_init(&thread_attr);
|
|
gettimeofday(&start, NULL);
|
|
for (i = 0; i < nthreads; i++) {
|
|
worker[i].tid = i;
|
|
worker[i].futex = calloc(nfutexes, sizeof(*worker[i].futex));
|
|
if (!worker[i].futex)
|
|
goto errmem;
|
|
|
|
CPU_ZERO(&cpu);
|
|
CPU_SET(i % ncpus, &cpu);
|
|
|
|
ret = pthread_attr_setaffinity_np(&thread_attr, sizeof(cpu_set_t), &cpu);
|
|
if (ret)
|
|
err(EXIT_FAILURE, "pthread_attr_setaffinity_np");
|
|
|
|
ret = pthread_create(&worker[i].thread, &thread_attr, workerfn,
|
|
(void *)(struct worker *) &worker[i]);
|
|
if (ret)
|
|
err(EXIT_FAILURE, "pthread_create");
|
|
|
|
}
|
|
pthread_attr_destroy(&thread_attr);
|
|
|
|
pthread_mutex_lock(&thread_lock);
|
|
while (threads_starting)
|
|
pthread_cond_wait(&thread_parent, &thread_lock);
|
|
pthread_cond_broadcast(&thread_worker);
|
|
pthread_mutex_unlock(&thread_lock);
|
|
|
|
sleep(nsecs);
|
|
toggle_done(0, NULL, NULL);
|
|
|
|
for (i = 0; i < nthreads; i++) {
|
|
ret = pthread_join(worker[i].thread, NULL);
|
|
if (ret)
|
|
err(EXIT_FAILURE, "pthread_join");
|
|
}
|
|
|
|
/* cleanup & report results */
|
|
pthread_cond_destroy(&thread_parent);
|
|
pthread_cond_destroy(&thread_worker);
|
|
pthread_mutex_destroy(&thread_lock);
|
|
|
|
for (i = 0; i < nthreads; i++) {
|
|
unsigned long t = worker[i].ops/runtime.tv_sec;
|
|
update_stats(&throughput_stats, t);
|
|
if (!silent) {
|
|
if (nfutexes == 1)
|
|
printf("[thread %2d] futex: %p [ %ld ops/sec ]\n",
|
|
worker[i].tid, &worker[i].futex[0], t);
|
|
else
|
|
printf("[thread %2d] futexes: %p ... %p [ %ld ops/sec ]\n",
|
|
worker[i].tid, &worker[i].futex[0],
|
|
&worker[i].futex[nfutexes-1], t);
|
|
}
|
|
|
|
free(worker[i].futex);
|
|
}
|
|
|
|
print_summary();
|
|
|
|
free(worker);
|
|
return ret;
|
|
errmem:
|
|
err(EXIT_FAILURE, "calloc");
|
|
}
|