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authorDavidlohr Bueso <davidlohr@hp.com>2013-12-15 08:31:55 +0400
committerArnaldo Carvalho de Melo <acme@redhat.com>2014-03-14 18:20:43 +0400
commita043971141f163f9845324a2f83502d15011485d (patch)
tree83be443556d7d7f5d2b650623fd18de0fd2cdc67 /tools/perf/builtin-bench.c
parent81827ed8d85e892311965dc9ec4120b2b2e745bd (diff)
downloadlinux-a043971141f163f9845324a2f83502d15011485d.tar.xz
perf bench: Add futex-hash microbenchmark
Introduce futexes to perf-bench and add a program that stresses and measures the kernel's implementation of the hash table. This is a multi-threaded program that simply measures the amount of failed futex wait calls - we only want to deal with the hashing overhead, so a negative return of futex_wait_setup() is enough to do the trick. An example run: $ perf bench futex hash -t 32 Run summary [PID 10989]: 32 threads, each operating on 1024 [private] futexes for 10 secs. [thread 0] futexes: 0x19d9b10 ... 0x19dab0c [ 418713 ops/sec ] [thread 1] futexes: 0x19daca0 ... 0x19dbc9c [ 469913 ops/sec ] [thread 2] futexes: 0x19dbe30 ... 0x19dce2c [ 479744 ops/sec ] ... [thread 31] futexes: 0x19fbb80 ... 0x19fcb7c [ 464179 ops/sec ] Averaged 454310 operations/sec (+- 0.84%), total secs = 10 Signed-off-by: Davidlohr Bueso <davidlohr@hp.com> Acked-by: Darren Hart <dvhart@linux.intel.com> Cc: Aswin Chandramouleeswaran <aswin@hp.com> Cc: Darren Hart <dvhart@linux.intel.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: Jason Low <jason.low2@hp.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Scott J Norton <scott.norton@hp.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Waiman Long <Waiman.Long@hp.com> Link: http://lkml.kernel.org/r/1387081917-9102-2-git-send-email-davidlohr@hp.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/builtin-bench.c')
-rw-r--r--tools/perf/builtin-bench.c10
1 files changed, 9 insertions, 1 deletions
diff --git a/tools/perf/builtin-bench.c b/tools/perf/builtin-bench.c
index e47f90cc7b98..a8b0138fc6a0 100644
--- a/tools/perf/builtin-bench.c
+++ b/tools/perf/builtin-bench.c
@@ -12,6 +12,7 @@
* sched ... scheduler and IPC performance
* mem ... memory access performance
* numa ... NUMA scheduling and MM performance
+ * futex ... Futex performance
*/
#include "perf.h"
#include "util/util.h"
@@ -54,6 +55,12 @@ static struct bench mem_benchmarks[] = {
{ NULL, NULL, NULL }
};
+static struct bench futex_benchmarks[] = {
+ { "hash", "Benchmark for futex hash table", bench_futex_hash },
+ { "all", "Test all futex benchmarks", NULL },
+ { NULL, NULL, NULL }
+};
+
struct collection {
const char *name;
const char *summary;
@@ -61,11 +68,12 @@ struct collection {
};
static struct collection collections[] = {
- { "sched", "Scheduler and IPC benchmarks", sched_benchmarks },
+ { "sched", "Scheduler and IPC benchmarks", sched_benchmarks },
{ "mem", "Memory access benchmarks", mem_benchmarks },
#ifdef HAVE_LIBNUMA_SUPPORT
{ "numa", "NUMA scheduling and MM benchmarks", numa_benchmarks },
#endif
+ {"futex", "Futex stressing benchmarks", futex_benchmarks },
{ "all", "All benchmarks", NULL },
{ NULL, NULL, NULL }
};