From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:47750) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Xz4Ah-0002l9-40 for qemu-devel@nongnu.org; Thu, 11 Dec 2014 08:52:53 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1Xz4Aa-0002Au-W0 for qemu-devel@nongnu.org; Thu, 11 Dec 2014 08:52:47 -0500 Received: from mx1.redhat.com ([209.132.183.28]:57821) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Xz4Aa-00029r-Ol for qemu-devel@nongnu.org; Thu, 11 Dec 2014 08:52:40 -0500 From: Paolo Bonzini Date: Thu, 11 Dec 2014 14:52:25 +0100 Message-Id: <1418305950-30924-1-git-send-email-pbonzini@redhat.com> Subject: [Qemu-devel] [PATCH v2 0/5] linux-aio: rewrite and simplify queuing code List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: kwolf@redhat.com, ming.lei@canonical.com, pl@kamp.de, stefanha@redhat.com This series rewrites the io_submit code to avoid having to synchronize the iocbs in two places (qemu_laiocb and LaioQueue). Instead, the queue of pending I/O requests is kept in a list. This fixes the problems with io_submit doing partial submissions or failing with EAGAIN, without complicating the code. The bug is shown by "qemu-img bench -n -t none -s 65536 -d 1024 -c 100000" pretty much instantly. Paolo v1->v2: add patch 4, and fix QSIMPLEQ_SPLIT_AFTER Paolo Bonzini (5): linux-aio: queue requests that cannot be submitted linux-aio: track whether the queue is blocked linux-aio: rename LaioQueue idx field to "n" linux-aio: drop return code from laio_io_unplug and ioq_submit linux-aio: simplify removal of completed iocbs from the list block/linux-aio.c | 99 ++++++++++++++++++++++++---------------------------- block/raw-aio.h | 2 +- include/qemu/queue.h | 11 ++++++ 3 files changed, 58 insertions(+), 54 deletions(-) -- 2.1.0