[PATCH v1 0/7] perf bench: Add qspinlock benchmark

[Yuzhuo Jing]

As an effort to improve the perf bench subcommand, this patch series
adds benchmark for the kernel's queued spinlock implementation.

This series imports necessary kernel definitions such as atomics,
introduces userspace per-cpu adapter, and imports the qspinlock
implementation from the kernel tree to tools tree, with minimum
adaptions.

This subcommand enables convenient commands to investigate the
performance of kernel lock implementations, such as using sampling:

    perf record -- ./perf bench sync qspinlock -t5
    perf report

Yuzhuo Jing (7):
  tools: Import cmpxchg and xchg functions
  tools: Import smp_cond_load and atomic_cond_read
  tools: Partial import of prefetch.h
  tools: Implement userspace per-cpu
  perf bench: Import qspinlock from kernel
  perf bench: Add 'bench sync qspinlock' subcommand
  perf bench sync: Add latency histogram functionality

 tools/arch/x86/include/asm/atomic.h           |  14 +
 tools/arch/x86/include/asm/cmpxchg.h          | 113 +++++
 tools/include/asm-generic/atomic-gcc.h        |  47 ++
 tools/include/asm/barrier.h                   |  58 +++
 tools/include/linux/atomic.h                  |  27 ++
 tools/include/linux/compiler_types.h          |  30 ++
 tools/include/linux/percpu-simulate.h         | 128 ++++++
 tools/include/linux/prefetch.h                |  41 ++
 tools/perf/bench/Build                        |   2 +
 tools/perf/bench/bench.h                      |   1 +
 .../perf/bench/include/mcs_spinlock-private.h | 115 +++++
 tools/perf/bench/include/mcs_spinlock.h       |  19 +
 tools/perf/bench/include/qspinlock-private.h  | 204 +++++++++
 tools/perf/bench/include/qspinlock.h          | 153 +++++++
 tools/perf/bench/include/qspinlock_types.h    |  98 +++++
 tools/perf/bench/qspinlock.c                  | 411 ++++++++++++++++++
 tools/perf/bench/sync.c                       | 329 ++++++++++++++
 tools/perf/builtin-bench.c                    |   7 +
 tools/perf/check-headers.sh                   |  32 ++
 19 files changed, 1829 insertions(+)
 create mode 100644 tools/include/linux/percpu-simulate.h
 create mode 100644 tools/include/linux/prefetch.h
 create mode 100644 tools/perf/bench/include/mcs_spinlock-private.h
 create mode 100644 tools/perf/bench/include/mcs_spinlock.h
 create mode 100644 tools/perf/bench/include/qspinlock-private.h
 create mode 100644 tools/perf/bench/include/qspinlock.h
 create mode 100644 tools/perf/bench/include/qspinlock_types.h
 create mode 100644 tools/perf/bench/qspinlock.c
 create mode 100644 tools/perf/bench/sync.c

-- 
2.50.1.487.gc89ff58d15-goog