[Qemu-devel] [PATCH v2 0/7] coroutine: optimizations

[Paolo Bonzini]

As discussed in the other thread, this brings speedups from
dropping the coroutine mutex (which serializes multiple iothreads,
too) and using ELF thread-local storage.

The speedup in perf/cost is about 50% (190->125).  Windows port tested
with tests/test-coroutine.exe under Wine.

Paolo

v1->v2: include the noinline attribute [many...]
        do not mention SwitchToFiber [Kevin]
        rename run_main_iothread_exit -> run_main_thread_exit
        leave personal opinions out of commit messages :) [Kevin]
        mention gain from patch 7 [Peter]
        change "alloc_pool_size +=" to "alloc_pool_size =" [Peter]

Paolo Bonzini (7):
  coroutine-ucontext: use __thread
  qemu-thread: add per-thread atexit functions
  test-coroutine: avoid overflow on 32-bit systems
  QSLIST: add lock-free operations
  coroutine: rewrite pool to avoid mutex
  coroutine: drop qemu_coroutine_adjust_pool_size
  coroutine: try harder not to delete coroutines

 block/block-backend.c     |   4 --
 coroutine-ucontext.c      |  64 +++++++---------------------
 include/block/coroutine.h |  10 -----
 include/qemu/queue.h      |  15 ++++++-
 include/qemu/thread.h     |   4 ++
 qemu-coroutine.c          | 104 ++++++++++++++++++++++------------------------
 tests/test-coroutine.c    |   2 +-
 util/qemu-thread-posix.c  |  37 +++++++++++++++++
 util/qemu-thread-win32.c  |  48 ++++++++++++++++-----
 9 files changed, 157 insertions(+), 131 deletions(-)

-- 
2.1.0