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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 /util/aio-posix.h | |
| parent | b321051cf48ccc2d3d832af111d688f2282f089b (diff) | |
| download | qemu-73fd282e7b6dd4e4ea1c3bbb3d302c8db51e4ccf.zip qemu-73fd282e7b6dd4e4ea1c3bbb3d302c8db51e4ccf.tar.gz qemu-73fd282e7b6dd4e4ea1c3bbb3d302c8db51e4ccf.tar.bz2 | |
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 'util/aio-posix.h')
| -rw-r--r-- | util/aio-posix.h | 20 |
1 files changed, 19 insertions, 1 deletions
diff --git a/util/aio-posix.h b/util/aio-posix.h index 97899d0..55fc771 100644 --- a/util/aio-posix.h +++ b/util/aio-posix.h @@ -27,10 +27,14 @@ struct AioHandler { IOHandler *io_poll_begin; IOHandler *io_poll_end; void *opaque; - bool is_external; QLIST_ENTRY(AioHandler) node; QLIST_ENTRY(AioHandler) node_ready; /* only used during aio_poll() */ QLIST_ENTRY(AioHandler) node_deleted; +#ifdef CONFIG_LINUX_IO_URING + QSLIST_ENTRY(AioHandler) node_submitted; + unsigned flags; /* see fdmon-io_uring.c */ +#endif + bool is_external; }; /* Add a handler to a ready list */ @@ -58,4 +62,18 @@ static inline void fdmon_epoll_disable(AioContext *ctx) } #endif /* !CONFIG_EPOLL_CREATE1 */ +#ifdef CONFIG_LINUX_IO_URING +bool fdmon_io_uring_setup(AioContext *ctx); +void fdmon_io_uring_destroy(AioContext *ctx); +#else +static inline bool fdmon_io_uring_setup(AioContext *ctx) +{ + return false; +} + +static inline void fdmon_io_uring_destroy(AioContext *ctx) +{ +} +#endif /* !CONFIG_LINUX_IO_URING */ + #endif /* AIO_POSIX_H */ |