[PATCH 0/3] perf bench: Add new benchmark for futex subsystem

[Hitoshi Mitake]

Hi folks, sorry for my very slow response...

I found that Darren's futextest contains Michel's test program now.
So I added it to 'perf bench' as sample.
If you like this style, I'd like to add rest part of futextest.

Example of use:
| % ./perf bench futex wait -t 48 -l 100000000
| # Running futex/wait benchmark...
| # Running 48 threads
| # Total number of iteration: 100000000
|    16233.763636 Kiter/sec
|        6.100000 user sec
|        0.000000 system sec
|        6.160000 wall sec
|        0.990260 cores
| % perf bench --format=simple futex wait
| 16207.455429

This patch series contains two typedefs (and one volatile).
I know typedef and volatile is not a thing to welcome.
But I judged these are not problematic things,
could you review this?

Hitoshi Mitake (3):
  perf bench: Add wrappers for atomic operation of GCC
  perf bench: Add new files for futex performance test
  perf bench: Fix misc files to build files related to futex

 tools/perf/Makefile                  |    1 +
 tools/perf/bench/bench.h             |    3 +-
 tools/perf/bench/futex-wait.c        |  218 ++++++++++++++++++++++++++
 tools/perf/bench/futextest.h         |  280 ++++++++++++++++++++++++++++++++++
 tools/perf/builtin-bench.c           |   16 ++-
 tools/perf/util/include/asm/atomic.h |   91 +++++++++++
 6 files changed, 606 insertions(+), 3 deletions(-)
 create mode 100644 tools/perf/bench/futex-wait.c
 create mode 100644 tools/perf/bench/futextest.h
 create mode 100644 tools/perf/util/include/asm/atomic.h

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