From: Thomas Gleixner <tglx@linutronix.de>
To: LKML <linux-kernel@vger.kernel.org>
Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Subject: [patch V2 6/7] perf/bench/futex-hash: Support preallocate hash table
Date: Thu, 05 May 2016 19:03:39 -0000 [thread overview]
Message-ID: <20160505170920.387462555@linutronix.de> (raw)
In-Reply-To: 20160505170339.026555108@linutronix.de
[-- Attachment #1: perf-bench-futex-hash-Support-preallocate-hash-table.patch --]
[-- Type: text/plain, Size: 2578 bytes --]
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>
---
tools/perf/bench/futex-hash.c | 16 ++++++++++++++--
tools/perf/bench/futex.h | 5 +++++
2 files changed, 19 insertions(+), 2 deletions(-)
--- a/tools/perf/bench/futex-hash.c
+++ b/tools/perf/bench/futex-hash.c
@@ -30,6 +30,7 @@ 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;
@@ -51,6 +52,7 @@ 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
@@ -138,6 +140,7 @@ int bench_futex_hash(int argc, const cha
unsigned int i, ncpus;
pthread_attr_t thread_attr;
struct worker *worker = NULL;
+ char *prealloc_str = NULL;
char *node_str = NULL;
unsigned int cpunum;
@@ -192,11 +195,20 @@ int bench_futex_hash(int argc, const cha
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);
--- a/tools/perf/bench/futex.h
+++ b/tools/perf/bench/futex.h
@@ -101,4 +101,9 @@ static inline int pthread_attr_setaffini
}
#endif
+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 */
next prev parent reply other threads:[~2016-05-05 19:05 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-05-05 19:03 [patch V2 0/7] Sebastian Andrzej Siewior <bigeasy@linutronix.de>, Linus Torvalds <torvalds@linux-foundation.org>, Darren Hart <darren@dvhart.com>, Peter Zijlstra <peterz@infradead.org>, Ingo Molnar <mingo@kernel.org>, Michael Kerrisk <mtk.manpages@googlemail.com>, Davidlohr Bueso <dave@stgolabs.net>, Chris Mason <clm@fb.com>, Carlos O'Donell <carlos@redhat.com>, Torvald Riegel <triegel@redhat.com>, Eric Dumazet <edumazet@google.com> Thomas Gleixner
2016-05-05 19:03 ` [patch V2 1/7] futex: Add some more function commentry Thomas Gleixner
2016-05-05 19:03 ` [patch V2 2/7] futex: Hash private futexes per process Thomas Gleixner
2016-05-05 19:03 ` [patch V2 3/7] futex: Add op for hash preallocation Thomas Gleixner
2016-05-05 19:03 ` [patch V2 4/7] futex: Add sysctl knobs for process private hash Thomas Gleixner
2016-05-05 19:03 ` Thomas Gleixner [this message]
2016-05-05 19:03 ` [patch V2 5/7] perf/bench/futex-hash: Support NUMA Thomas Gleixner
2016-05-05 19:03 ` [patch V2 7/7] futex.2: Document hash preallocation opcode Thomas Gleixner
2016-05-05 20:44 [patch V2 0/7] futex: Add support for process private hashing Thomas Gleixner
2016-05-05 20:44 ` [patch V2 6/7] perf/bench/futex-hash: Support preallocate hash table Thomas Gleixner
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