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| author | Stefan Hajnoczi <stefanha@redhat.com> | 2020-03-05 17:08:04 +0000 |
|---|---|---|
| committer | Stefan Hajnoczi <stefanha@redhat.com> | 2020-03-09 16:41:31 +0000 |
| commit | 73fd282e7b6dd4e4ea1c3bbb3d302c8db51e4ccf (patch) | |
| tree | 1338ebeba78a352f20904f9118f694c459599179 /include | |
| parent | b321051cf48ccc2d3d832af111d688f2282f089b (diff) | |
| download | focaccia-qemu-73fd282e7b6dd4e4ea1c3bbb3d302c8db51e4ccf.tar.gz focaccia-qemu-73fd282e7b6dd4e4ea1c3bbb3d302c8db51e4ccf.zip | |
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')
| -rw-r--r-- | include/block/aio.h | 9 |
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 |