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| author | Thomas Gleixner <tglx@linutronix.de> | 2016-05-05 20:44:07 +0000 |
|---|---|---|
| committer | Sebastian Andrzej Siewior <bigeasy@linutronix.de> | 2016-10-06 17:29:33 +0200 |
| commit | 83afd52526d1bc9725d8a8fed8807e165a136355 (patch) | |
| tree | 31efc960106e23d4022c232b1019f8a09ccbfdea | |
| parent | f27b22b247bcfb51beef2556ff28e6afa411fc94 (diff) | |
| download | linux-futex-futex_v10_per_task_hash.tar.gz | |
perf/bench/futex-hash: Support preallocate hash tablefutex_v10_per_task_hash
Instead of using the default hash size on the first allocation it is
possible to allocate a specific number of slots upfront.
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
| -rw-r--r-- | tools/perf/bench/futex-hash.c | 16 | ||||
| -rw-r--r-- | tools/perf/bench/futex.h | 7 |
2 files changed, 21 insertions, 2 deletions
diff --git a/tools/perf/bench/futex-hash.c b/tools/perf/bench/futex-hash.c index e075d6f5a4c602..0625f2e79cad06 100644 --- a/tools/perf/bench/futex-hash.c +++ b/tools/perf/bench/futex-hash.c @@ -35,6 +35,7 @@ static unsigned int nsecs = 10; static unsigned int nfutexes = 1024; static bool fshared = false, done = false, silent = false; static int futex_flag = 0; +static unsigned int prealloc; static int numa_node = -1; struct timeval start, end, runtime; @@ -56,6 +57,7 @@ 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"), + OPT_UINTEGER('p', "prealloc",&prealloc, "Specify number of preallocated hash slots"), #ifdef CONFIG_NUMA OPT_INTEGER( 'n', "numa", &numa_node, "Specify the NUMA node"), #endif @@ -143,6 +145,7 @@ int bench_futex_hash(int argc, const char **argv, unsigned int i, ncpus; pthread_attr_t thread_attr; struct worker *worker = NULL; + char *prealloc_str = NULL; char *node_str = NULL; unsigned int cpunum; @@ -197,11 +200,20 @@ int bench_futex_hash(int argc, const char **argv, if (!fshared) futex_flag = FUTEX_PRIVATE_FLAG; - printf("Run summary [PID %d]: %d threads%s, each operating on %d [%s] futexes for %d secs.\n\n", + if (prealloc) { + ret = futex_preallocate(prealloc); + if (ret < 0) + err(EXIT_FAILURE, "futex_prealloate"); + ret = asprintf(&prealloc_str, " P %u %d", prealloc, ret); + if (ret < 0) + err(EXIT_FAILURE, "futex_preallocate, asprintf"); + } + + printf("Run summary [PID %d]: %d threads%s, each operating on %d [%s%s] futexes for %d secs.\n\n", getpid(), nthreads, node_str ? : "", nfutexes, fshared ? "shared":"private", - nsecs); + prealloc_str ? : "", nsecs); init_stats(&throughput_stats); pthread_mutex_init(&thread_lock, NULL); diff --git a/tools/perf/bench/futex.h b/tools/perf/bench/futex.h index b2e06d1190d076..dc02397875bccb 100644 --- a/tools/perf/bench/futex.h +++ b/tools/perf/bench/futex.h @@ -99,4 +99,11 @@ static inline int pthread_attr_setaffinity_np(pthread_attr_t *attr, } #endif +#define FUTEX_PREALLOC_HASH 13 + +static inline int futex_preallocate(u_int32_t hash_size) +{ + return futex(0, FUTEX_PREALLOC_HASH, hash_size, NULL, NULL, 0, 0); +} + #endif /* _FUTEX_H */ |