v2: Emulate nanoseconds precison of timeout with ppoll and timerfd. Their performance is on par with each other, but both much better than qemu.git:
syscall high # of fd low # of fd ------------------------------------------------- qemu.git(ppoll) 44 96 ppoll+epoll 85 101 timerfd+epoll 87 109 (In high # of fd case, 3 activated but idle virtio-console devices are attached, which will add us hundereds of fds to poll) v1 cover letter --------------- ppoll(2) doesn't scale as well as epoll: The elapsed time of the syscall is linear to the number of fd's we poll, which hurts performance a bit when the number of devices are many, or when a virtio device registers many virtqueues (virtio-serial, for instance). This series introduces qemu_poll, which is implemented with g_poll and epoll, decided at configure time with CONFIG_EPOLL. Fam Fam Zheng (6): poll: Introduce QEMU Poll API posix-aio: Use QEMU poll interface poll: Add epoll implementation for qemu_poll main-loop: Replace qemu_poll_ns with qemu_poll tests: Add test case for qemu_poll poll-linux: Add timerfd support Makefile.objs | 2 + aio-posix.c | 52 ++++---- async.c | 5 +- include/block/aio.h | 7 +- include/qemu/poll.h | 40 ++++++ include/qemu/timer.h | 13 -- include/qemu/typedefs.h | 2 + main-loop.c | 35 +++++- poll-glib.c | 130 ++++++++++++++++++++ poll-linux.c | 314 ++++++++++++++++++++++++++++++++++++++++++++++++ qemu-timer.c | 28 ----- tests/Makefile | 2 + tests/test-poll.c | 272 +++++++++++++++++++++++++++++++++++++++++ 13 files changed, 821 insertions(+), 81 deletions(-) create mode 100644 include/qemu/poll.h create mode 100644 poll-glib.c create mode 100644 poll-linux.c create mode 100644 tests/test-poll.c -- 1.9.3