From: Tommi Rantala <[email protected]> Fix div-by-zero if runtime is zero:
$ perf bench futex hash --runtime=0 # Running 'futex/hash' benchmark: Run summary [PID 12090]: 4 threads, each operating on 1024 [private] futexes for 0 secs. Floating point exception (core dumped) Signed-off-by: Tommi Rantala <[email protected]> Acked-by: Jiri Olsa <[email protected]> Cc: Alexander Shishkin <[email protected]> Cc: Darren Hart <[email protected]> Cc: Mark Rutland <[email protected]> Cc: Namhyung Kim <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: Thomas Gleixner <[email protected]> Link: http://lore.kernel.org/lkml/[email protected] Signed-off-by: Arnaldo Carvalho de Melo <[email protected]> --- tools/perf/bench/epoll-wait.c | 3 ++- tools/perf/bench/futex-hash.c | 3 ++- tools/perf/bench/futex-lock-pi.c | 3 ++- 3 files changed, 6 insertions(+), 3 deletions(-) diff --git a/tools/perf/bench/epoll-wait.c b/tools/perf/bench/epoll-wait.c index f938c585d512..cf797362675b 100644 --- a/tools/perf/bench/epoll-wait.c +++ b/tools/perf/bench/epoll-wait.c @@ -519,7 +519,8 @@ int bench_epoll_wait(int argc, const char **argv) qsort(worker, nthreads, sizeof(struct worker), cmpworker); for (i = 0; i < nthreads; i++) { - unsigned long t = worker[i].ops / bench__runtime.tv_sec; + unsigned long t = bench__runtime.tv_sec > 0 ? + worker[i].ops / bench__runtime.tv_sec : 0; update_stats(&throughput_stats, t); diff --git a/tools/perf/bench/futex-hash.c b/tools/perf/bench/futex-hash.c index 65eebe06c04d..915bf3da7ce2 100644 --- a/tools/perf/bench/futex-hash.c +++ b/tools/perf/bench/futex-hash.c @@ -205,7 +205,8 @@ int bench_futex_hash(int argc, const char **argv) pthread_mutex_destroy(&thread_lock); for (i = 0; i < nthreads; i++) { - unsigned long t = worker[i].ops / bench__runtime.tv_sec; + unsigned long t = bench__runtime.tv_sec > 0 ? + worker[i].ops / bench__runtime.tv_sec : 0; update_stats(&throughput_stats, t); if (!silent) { if (nfutexes == 1) diff --git a/tools/perf/bench/futex-lock-pi.c b/tools/perf/bench/futex-lock-pi.c index 89fd8f325f38..bb25d8beb3b8 100644 --- a/tools/perf/bench/futex-lock-pi.c +++ b/tools/perf/bench/futex-lock-pi.c @@ -211,7 +211,8 @@ int bench_futex_lock_pi(int argc, const char **argv) pthread_mutex_destroy(&thread_lock); for (i = 0; i < nthreads; i++) { - unsigned long t = worker[i].ops / bench__runtime.tv_sec; + unsigned long t = bench__runtime.tv_sec > 0 ? + worker[i].ops / bench__runtime.tv_sec : 0; update_stats(&throughput_stats, t); if (!silent) -- 2.21.1
