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authorDavidlohr Bueso <davidlohr@hp.com>2013-12-14 20:31:55 -0800
committerArnaldo Carvalho de Melo <acme@redhat.com>2014-03-14 11:20:43 -0300
commita043971141f163f9845324a2f83502d15011485d (patch)
tree83be443556d7d7f5d2b650623fd18de0fd2cdc67 /tools/perf/perf.h
parent81827ed8d85e892311965dc9ec4120b2b2e745bd (diff)
downloadlinux-a043971141f163f9845324a2f83502d15011485d.tar.bz2
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/perf.h')
-rw-r--r--tools/perf/perf.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/tools/perf/perf.h b/tools/perf/perf.h
index 6898ad0e199f..e18a8b5e6953 100644
--- a/tools/perf/perf.h
+++ b/tools/perf/perf.h
@@ -12,6 +12,9 @@
#ifndef __NR_perf_event_open
# define __NR_perf_event_open 336
#endif
+#ifndef __NR_futex
+# define __NR_futex 240
+#endif
#endif
#if defined(__x86_64__)
@@ -23,6 +26,9 @@
#ifndef __NR_perf_event_open
# define __NR_perf_event_open 298
#endif
+#ifndef __NR_futex
+# define __NR_futex 202
+#endif
#endif
#ifdef __powerpc__