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Date: Thu, 19 Jun 2014 13:41:24 -0300
From: Arnaldo Carvalho de Melo <acme@...nel.org>
To: Davidlohr Bueso <davidlohr@...com>
Cc: jolsa@...nel.org, mitake@....info.waseda.ac.jp, aswin@...com,
linux-kernel@...r.kernel.org, Darren Hart <darren@...art.com>
Subject: Re: [PATCH 9/9] perf bench: futex: Support operations for shared
futexes
Em Mon, Jun 16, 2014 at 11:14:27AM -0700, Davidlohr Bueso escreveu:
> 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.
Also isn't this benchmark related to something Darren did? Just checking
why he isn't in the CC list, Darren, does this all sound fine to you?
- Arnaldo
> Signed-off-by: Davidlohr Bueso <davidlohr@...com>
> ---
> tools/perf/bench/futex-hash.c | 7 +++++--
> tools/perf/bench/futex-requeue.c | 22 ++++++++++++++--------
> tools/perf/bench/futex-wake.c | 15 ++++++++++-----
> 3 files changed, 29 insertions(+), 15 deletions(-)
>
> diff --git a/tools/perf/bench/futex-hash.c b/tools/perf/bench/futex-hash.c
> index 14791eb..5175171 100644
> --- a/tools/perf/bench/futex-hash.c
> +++ b/tools/perf/bench/futex-hash.c
> @@ -26,6 +26,7 @@ static unsigned int nsecs = 10;
> /* amount of futexes per thread */
> static unsigned int nfutexes = 1024;
> static bool fshared = false, done = false;
> +static int futex_flag = 0;
>
> struct timeval start, end, runtime;
> static pthread_mutex_t thread_lock;
> @@ -74,8 +75,7 @@ static void *workerfn(void *arg)
> * such as internal waitqueue handling, thus enlarging
> * the critical region protected by hb->lock.
> */
> - ret = futex_wait(&w->futex[i], 1234, NULL,
> - fshared ? 0 : FUTEX_PRIVATE_FLAG);
> + ret = futex_wait(&w->futex[i], 1234, NULL, futex_flag);
> if (bench_format == BENCH_FORMAT_DEFAULT &&
> (!ret || errno != EAGAIN || errno != EWOULDBLOCK))
> warn("Non-expected futex return call");
> @@ -147,6 +147,9 @@ int bench_futex_hash(int argc, const char **argv,
> if (!worker)
> goto errmem;
>
> + if (!fshared)
> + futex_flag = FUTEX_PRIVATE_FLAG;
> +
> if (bench_format == BENCH_FORMAT_DEFAULT) {
> 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);
> diff --git a/tools/perf/bench/futex-requeue.c b/tools/perf/bench/futex-requeue.c
> index 7b211c1..197537b 100644
> --- a/tools/perf/bench/futex-requeue.c
> +++ b/tools/perf/bench/futex-requeue.c
> @@ -30,15 +30,17 @@ static u_int32_t futex1 = 0, futex2 = 0;
> static unsigned int nrequeue = 1;
>
> static pthread_t *worker;
> -static bool done = 0;
> +static bool done = false, fshared = false;
> static pthread_mutex_t thread_lock;
> static pthread_cond_t thread_parent, thread_worker;
> static struct stats requeuetime_stats, requeued_stats;
> static unsigned int ncpus, threads_starting, nthreads = 0;
> +static int futex_flag = 0;
>
> static const struct option options[] = {
> OPT_UINTEGER('t', "threads", &nthreads, "Specify amount of threads"),
> OPT_UINTEGER('q', "nrequeue", &nrequeue, "Specify amount of threads to requeue at once"),
> + OPT_BOOLEAN('S', "shared", &fshared, "Use shared futexes instead of private ones"),
> OPT_END()
> };
>
> @@ -80,7 +82,7 @@ static void *workerfn(void *arg __maybe_unused)
> pthread_cond_wait(&thread_worker, &thread_lock);
> pthread_mutex_unlock(&thread_lock);
>
> - futex_wait(&futex1, 0, NULL, FUTEX_PRIVATE_FLAG);
> + futex_wait(&futex1, 0, NULL, futex_flag);
> return NULL;
> }
>
> @@ -137,10 +139,13 @@ int bench_futex_requeue(int argc, const char **argv,
> if (!worker)
> err(EXIT_FAILURE, "calloc");
>
> + if (!fshared)
> + futex_flag = FUTEX_PRIVATE_FLAG;
> +
> if (bench_format == BENCH_FORMAT_DEFAULT) {
> - printf("Run summary [PID %d]: Requeuing %d threads (from %p to %p), "
> - "%d at a time.\n\n",
> - getpid(), nthreads, &futex1, &futex2, nrequeue);
> + printf("Run summary [PID %d]: Requeuing %d threads (from [%s] futex %p to %p), "
> + "%d at a time.\n\n", getpid(), nthreads,
> + fshared ? "shared":"private", &futex1, &futex2, nrequeue);
> }
>
> init_stats(&requeued_stats);
> @@ -173,8 +178,9 @@ int bench_futex_requeue(int argc, const char **argv,
> * Do not wakeup any tasks blocked on futex1, allowing
> * us to really measure futex_wait functionality.
> */
> - futex_cmp_requeue(&futex1, 0, &futex2, 0, nrequeue,
> - FUTEX_PRIVATE_FLAG);
> + futex_cmp_requeue(&futex1, 0, &futex2, 0,
> + nrequeue, futex_flag);
> +
> gettimeofday(&end, NULL);
> timersub(&end, &start, &runtime);
>
> @@ -187,7 +193,7 @@ int bench_futex_requeue(int argc, const char **argv,
> }
>
> /* everybody should be blocked on futex2, wake'em up */
> - nrequeued = futex_wake(&futex2, nthreads, FUTEX_PRIVATE_FLAG);
> + nrequeued = futex_wake(&futex2, nthreads, futex_flag);
> if (nthreads != nrequeued)
> warnx("couldn't wakeup all tasks (%d/%d)", nrequeued, nthreads);
>
> diff --git a/tools/perf/bench/futex-wake.c b/tools/perf/bench/futex-wake.c
> index eae6d09..08f62eb 100644
> --- a/tools/perf/bench/futex-wake.c
> +++ b/tools/perf/bench/futex-wake.c
> @@ -31,15 +31,17 @@ static u_int32_t futex1 = 0;
> static unsigned int nwakes = 1;
>
> pthread_t *worker;
> -static bool done = false;
> +static bool done = false, fshared = false;
> static pthread_mutex_t thread_lock;
> static pthread_cond_t thread_parent, thread_worker;
> static struct stats waketime_stats, wakeup_stats;
> static unsigned int ncpus, threads_starting, nthreads = 0;
> +static int futex_flag = 0;
>
> static const struct option options[] = {
> OPT_UINTEGER('t', "threads", &nthreads, "Specify amount of threads"),
> OPT_UINTEGER('w', "nwakes", &nwakes, "Specify amount of threads to wake at once"),
> + OPT_BOOLEAN('S', "shared", &fshared, "Use shared futexes instead of private ones"),
> OPT_END()
> };
>
> @@ -57,7 +59,7 @@ static void *workerfn(void *arg __maybe_unused)
> pthread_cond_wait(&thread_worker, &thread_lock);
> pthread_mutex_unlock(&thread_lock);
>
> - futex_wait(&futex1, 0, NULL, FUTEX_PRIVATE_FLAG);
> + futex_wait(&futex1, 0, NULL, futex_flag);
> return NULL;
> }
>
> @@ -140,10 +142,13 @@ int bench_futex_wake(int argc, const char **argv,
> if (!worker)
> err(EXIT_FAILURE, "calloc");
>
> + if (!fshared)
> + futex_flag = FUTEX_PRIVATE_FLAG;
> +
> if (bench_format == BENCH_FORMAT_DEFAULT)
> - printf("Run summary [PID %d]: blocking on %d threads (at futex %p), "
> + printf("Run summary [PID %d]: blocking on %d threads (at [%s] futex %p), "
> "waking up %d at a time.\n\n",
> - getpid(), nthreads, &futex1, nwakes);
> + getpid(), nthreads, fshared ? "shared":"private", &futex1, nwakes);
>
> init_stats(&wakeup_stats);
> init_stats(&waketime_stats);
> @@ -171,7 +176,7 @@ int bench_futex_wake(int argc, const char **argv,
> /* Ok, all threads are patiently blocked, start waking folks up */
> gettimeofday(&start, NULL);
> while (nwoken != nthreads)
> - nwoken += futex_wake(&futex1, nwakes, FUTEX_PRIVATE_FLAG);
> + nwoken += futex_wake(&futex1, nwakes, futex_flag);
> gettimeofday(&end, NULL);
> timersub(&end, &start, &runtime);
>
> --
> 1.8.1.4
--
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