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authorStefan Hajnoczi <stefanha@redhat.com>2020-03-05 17:08:04 +0000
committerStefan Hajnoczi <stefanha@redhat.com>2020-03-09 16:41:31 +0000
commit73fd282e7b6dd4e4ea1c3bbb3d302c8db51e4ccf (patch)
tree1338ebeba78a352f20904f9118f694c459599179 /include/block/aio.h
parentb321051cf48ccc2d3d832af111d688f2282f089b (diff)
downloadqemu-arm-73fd282e7b6dd4e4ea1c3bbb3d302c8db51e4ccf.tar.gz
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 <stefanha@redhat.com> Link: https://lore.kernel.org/r/20200305170806.1313245-6-stefanha@redhat.com Message-Id: <20200305170806.1313245-6-stefanha@redhat.com>
Diffstat (limited to 'include/block/aio.h')
-rw-r--r--include/block/aio.h9
1 files changed, 9 insertions, 0 deletions
diff --git a/include/block/aio.h b/include/block/aio.h
index bd76b08f1a..83fc9b844d 100644
--- a/include/block/aio.h
+++ b/include/block/aio.h
@@ -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