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Davidlohr Bueso a043971141 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>
 		2014-03-14 11:20:43 -03:00
..
bench.h perf bench: Add futex-hash microbenchmark 2014-03-14 11:20:43 -03:00
futex-hash.c perf bench: Add futex-hash microbenchmark 2014-03-14 11:20:43 -03:00
futex.h perf bench: Add futex-hash microbenchmark 2014-03-14 11:20:43 -03:00
mem-memcpy-arch.h tools/perf: Standardize feature support define names to: HAVE_{FEATURE}_SUPPORT 2013-10-09 08:48:28 +02:00
mem-memcpy-x86-64-asm-def.h perf bench: Also allow measuring alternative memcpy implementations 2012-01-24 19:51:01 -02:00
mem-memcpy-x86-64-asm.S Merge branch 'perf/urgent' into perf/core 2012-02-06 19:11:02 -02:00
mem-memcpy.c tools/perf: Standardize feature support define names to: HAVE_{FEATURE}_SUPPORT 2013-10-09 08:48:28 +02:00
mem-memset-arch.h tools/perf: Standardize feature support define names to: HAVE_{FEATURE}_SUPPORT 2013-10-09 08:48:28 +02:00
mem-memset-x86-64-asm-def.h perf bench: Also allow measuring memset() 2012-01-24 20:25:32 -02:00
mem-memset-x86-64-asm.S perf tool: Fix perf stack to non executable on x86_64 2012-02-06 19:14:17 -02:00
mem-memset.c tools/perf: Standardize feature support define names to: HAVE_{FEATURE}_SUPPORT 2013-10-09 08:48:28 +02:00
numa.c perf tools: Fix bench/numa.c for 32-bit build 2013-10-21 11:19:42 -03:00
sched-messaging.c perf tools: Use __maybe_used for unused variables 2012-09-11 12:19:15 -03:00
sched-pipe.c perf bench sched: Add --threaded option 2013-10-11 12:17:25 -03:00