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authorDavidlohr Bueso <dave@stgolabs.net>2017-11-27 07:20:59 +0300
committerArnaldo Carvalho de Melo <acme@redhat.com>2017-11-30 20:02:05 +0300
commit3b2323c2c1c4acf8961cfcdddcee9889daaa21e3 (patch)
treea366e8b5137d89f10885ff7d0e6ade8ed0cbf047 /tools/perf/bench/futex-hash.c
parent17a68b835921c4664929376447cae5e3374ce2a7 (diff)
downloadlinux-3b2323c2c1c4acf8961cfcdddcee9889daaa21e3.tar.xz
perf bench futex: Use cpumaps
It was reported that the whole futex bench breaks when dealing with non-contiguously numbered cpus. $ echo 0 | sudo tee /sys/devices/system/cpu/cpu3/online $ ./perf bench futex all perf: pthread_create: Operation not permitted Run summary [PID 14934]: 7 threads, each .... James had implemented an approach with cpumaps that use an in house flavor. Instead of re-inventing the wheel, I've redone the patch such that we use the perf's util/cpumap.c interface instead. Applies to all futex benchmarks. Suggested-by: Arnaldo Carvalho de Melo <acme@redhat.com> Originally-from: James Yang <james.yang@arm.com> Signed-off-by: Davidlohr Bueso <dbueso@suse.de> Cc: Davidlohr Bueso <dbueso@suse.de> Cc: Kim Phillips <kim.phillips@arm.com> Link: http://lkml.kernel.org/r/20171127042101.3659-2-dave@stgolabs.net Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/bench/futex-hash.c')
-rw-r--r--tools/perf/bench/futex-hash.c19
1 files changed, 12 insertions, 7 deletions
diff --git a/tools/perf/bench/futex-hash.c b/tools/perf/bench/futex-hash.c
index 58ae6ed8f38b..2defb6df7fd0 100644
--- a/tools/perf/bench/futex-hash.c
+++ b/tools/perf/bench/futex-hash.c
@@ -24,6 +24,7 @@
#include <subcmd/parse-options.h>
#include "bench.h"
#include "futex.h"
+#include "cpumap.h"
#include <err.h>
#include <sys/time.h>
@@ -118,11 +119,12 @@ static void print_summary(void)
int bench_futex_hash(int argc, const char **argv)
{
int ret = 0;
- cpu_set_t cpu;
+ cpu_set_t cpuset;
struct sigaction act;
- unsigned int i, ncpus;
+ unsigned int i;
pthread_attr_t thread_attr;
struct worker *worker = NULL;
+ struct cpu_map *cpu;
argc = parse_options(argc, argv, options, bench_futex_hash_usage, 0);
if (argc) {
@@ -130,14 +132,16 @@ int bench_futex_hash(int argc, const char **argv)
exit(EXIT_FAILURE);
}
- ncpus = sysconf(_SC_NPROCESSORS_ONLN);
+ cpu = cpu_map__new(NULL);
+ if (!cpu)
+ goto errmem;
sigfillset(&act.sa_mask);
act.sa_sigaction = toggle_done;
sigaction(SIGINT, &act, NULL);
if (!nthreads) /* default to the number of CPUs */
- nthreads = ncpus;
+ nthreads = cpu->nr;
worker = calloc(nthreads, sizeof(*worker));
if (!worker)
@@ -163,10 +167,10 @@ int bench_futex_hash(int argc, const char **argv)
if (!worker[i].futex)
goto errmem;
- CPU_ZERO(&cpu);
- CPU_SET(i % ncpus, &cpu);
+ CPU_ZERO(&cpuset);
+ CPU_SET(cpu->map[i % cpu->nr], &cpuset);
- ret = pthread_attr_setaffinity_np(&thread_attr, sizeof(cpu_set_t), &cpu);
+ ret = pthread_attr_setaffinity_np(&thread_attr, sizeof(cpu_set_t), &cpuset);
if (ret)
err(EXIT_FAILURE, "pthread_attr_setaffinity_np");
@@ -217,6 +221,7 @@ int bench_futex_hash(int argc, const char **argv)
print_summary();
free(worker);
+ free(cpu);
return ret;
errmem:
err(EXIT_FAILURE, "calloc");