From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:58845) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Yibs3-0004zJ-GK for qemu-devel@nongnu.org; Thu, 16 Apr 2015 00:57:48 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1Yibs0-00037U-0l for qemu-devel@nongnu.org; Thu, 16 Apr 2015 00:57:47 -0400 Received: from mx1.redhat.com ([209.132.183.28]:33810) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Yibrz-00037A-Nw for qemu-devel@nongnu.org; Thu, 16 Apr 2015 00:57:43 -0400 Received: from int-mx11.intmail.prod.int.phx2.redhat.com (int-mx11.intmail.prod.int.phx2.redhat.com [10.5.11.24]) by mx1.redhat.com (8.14.4/8.14.4) with ESMTP id t3G4vg4e006888 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=FAIL) for ; Thu, 16 Apr 2015 00:57:42 -0400 From: Fam Zheng Date: Thu, 16 Apr 2015 12:57:29 +0800 Message-Id: <1429160256-27231-1-git-send-email-famz@redhat.com> Subject: [Qemu-devel] [PATCH v3 0/7] aio: Support epoll by introducing qemu_poll abstraction List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: Kevin Wolf , Paolo Bonzini , Stefan Hajnoczi v3: Rebase to master for 2.4. Although epoll_pwait1 syscall is still being worked on [1], the QEMU part (if any) will base on this, so let's merge it first. That part is not included in this version because I'm still evaluating by comparing epoll_pwait1 with epoll+timerfd as with current master they seem to be really close. [1]: http://www.spinics.net/lists/linux-api/msg08216.html 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 (7): 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-glib: Support ppoll 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 | 4 +- main-loop.c | 35 +++++- poll-glib.c | 153 +++++++++++++++++++++++ poll-linux.c | 314 ++++++++++++++++++++++++++++++++++++++++++++++++ qemu-timer.c | 28 ----- tests/Makefile | 2 + tests/test-poll.c | 272 +++++++++++++++++++++++++++++++++++++++++ 13 files changed, 845 insertions(+), 82 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