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[Qemu-devel] [PATCH v2 0/6] aio: Support epoll by introducing qemu_poll
From: |
Fam Zheng |
Subject: |
[Qemu-devel] [PATCH v2 0/6] aio: Support epoll by introducing qemu_poll abstraction |
Date: |
Thu, 4 Dec 2014 11:43:04 +0800 |
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
- [Qemu-devel] [PATCH v2 0/6] aio: Support epoll by introducing qemu_poll abstraction,
Fam Zheng <=
- [Qemu-devel] [PATCH v2 1/6] poll: Introduce QEMU Poll API, Fam Zheng, 2014/12/03
- [Qemu-devel] [PATCH v2 2/6] posix-aio: Use QEMU poll interface, Fam Zheng, 2014/12/03
- [Qemu-devel] [PATCH v2 3/6] poll: Add epoll implementation for qemu_poll, Fam Zheng, 2014/12/03
- [Qemu-devel] [PATCH v2 4/6] main-loop: Replace qemu_poll_ns with qemu_poll, Fam Zheng, 2014/12/03
- [Qemu-devel] [PATCH v2 5/6] tests: Add test case for qemu_poll, Fam Zheng, 2014/12/03
- [Qemu-devel] [PATCH v2 6/6] poll-linux: Add timerfd support, Fam Zheng, 2014/12/03
- Re: [Qemu-devel] [PATCH v2 0/6] aio: Support epoll by introducing qemu_poll abstraction, Fam Zheng, 2014/12/15