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aio-posix: add io_uring fd monitoring implementation

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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 <stefanha@redhat.com>
Link: https://lore.kernel.org/r/20200305170806.1313245-6-stefanha@redhat.com
Message-Id: <20200305170806.1313245-6-stefanha@redhat.com>
This commit is contained in:
Stefan Hajnoczi 2020-03-05 17:08:04 +00:00
parent b321051cf4
commit 73fd282e7b
6 changed files with 376 additions and 5 deletions
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9
include/block/aio.h
View file

@ -14,6 +14,9 @@
#ifndef QEMU_AIO_H
#define QEMU_AIO_H
#ifdef CONFIG_LINUX_IO_URING
#include <liburing.h>
#endif
#include "qemu/queue.h"
#include "qemu/event_notifier.h"
#include "qemu/thread.h"
@ -96,6 +99,8 @@ struct BHListSlice {
QSIMPLEQ_ENTRY(BHListSlice) next;
};
typedef QSLIST_HEAD(, AioHandler) AioHandlerSList;
struct AioContext {
GSource source;
@ -181,6 +186,10 @@ struct AioContext {
* locking.
*/
struct LuringState *linux_io_uring;
/* State for file descriptor monitoring using Linux io_uring */
struct io_uring fdmon_io_uring;
AioHandlerSList submit_list;
#endif
/* TimerLists for calling timers - one per clock type. Has its own