From 73fd282e7b6dd4e4ea1c3bbb3d302c8db51e4ccf Mon Sep 17 00:00:00 2001 From: Stefan Hajnoczi Date: Thu, 5 Mar 2020 17:08:04 +0000 Subject: aio-posix: add io_uring fd monitoring implementation The recent Linux io_uring API has several advantages over ppoll(2) and epoll(2). Details are given in the source code. Add an io_uring implementation and make it the default on Linux. Performance is the same as with epoll(7) but later patches add optimizations that take advantage of io_uring. It is necessary to change how aio_set_fd_handler() deals with deleting AioHandlers since removing monitored file descriptors is asynchronous in io_uring. fdmon_io_uring_remove() marks the AioHandler deleted and aio_set_fd_handler() will let it handle deletion in that case. Signed-off-by: Stefan Hajnoczi Link: https://lore.kernel.org/r/20200305170806.1313245-6-stefanha@redhat.com Message-Id: <20200305170806.1313245-6-stefanha@redhat.com> --- configure | 5 +++++ 1 file changed, 5 insertions(+) (limited to 'configure') diff --git a/configure b/configure index cbf864bff1..3c7470096f 100755 --- a/configure +++ b/configure @@ -4093,6 +4093,11 @@ if test "$linux_io_uring" != "no" ; then linux_io_uring_cflags=$($pkg_config --cflags liburing) linux_io_uring_libs=$($pkg_config --libs liburing) linux_io_uring=yes + + # io_uring is used in libqemuutil.a where per-file -libs variables are not + # seen by programs linking the archive. It's not ideal, but just add the + # library dependency globally. + LIBS="$linux_io_uring_libs $LIBS" else if test "$linux_io_uring" = "yes" ; then feature_not_found "linux io_uring" "Install liburing devel" -- cgit v1.2.3-55-g7522