diff options
| author | Sam Li <faithilikerun@gmail.com> | 2022-05-31 18:50:11 +0800 |
|---|---|---|
| committer | Stefan Hajnoczi <stefanha@redhat.com> | 2022-06-15 14:50:41 +0100 |
| commit | e2848bc574fe2715c694bf8fe9a1ba7f78a1125a (patch) | |
| tree | d9102f20555ac4a6d03fae58175c977a988422bd /meson.build | |
| parent | 9e4067b8a41514c8f5715a2c735c3ac03e5d70c8 (diff) | |
Use io_uring_register_ring_fd() to skip fd operations
Linux recently added a new io_uring(7) optimization API that QEMU
doesn't take advantage of yet. The liburing library that QEMU uses
has added a corresponding new API calling io_uring_register_ring_fd().
When this API is called after creating the ring, the io_uring_submit()
library function passes a flag to the io_uring_enter(2) syscall
allowing it to skip the ring file descriptor fdget()/fdput()
operations. This saves some CPU cycles.
Signed-off-by: Sam Li <faithilikerun@gmail.com>
Message-id: 20220531105011.111082-1-faithilikerun@gmail.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Diffstat (limited to 'meson.build')
| -rw-r--r-- | meson.build | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/meson.build b/meson.build index 0c2e11ff07..9e65cc5367 100644 --- a/meson.build +++ b/meson.build @@ -1752,6 +1752,7 @@ config_host_data.set('CONFIG_LIBNFS', libnfs.found()) config_host_data.set('CONFIG_LIBSSH', libssh.found()) config_host_data.set('CONFIG_LINUX_AIO', libaio.found()) config_host_data.set('CONFIG_LINUX_IO_URING', linux_io_uring.found()) +config_host_data.set('CONFIG_LIBURING_REGISTER_RING_FD', cc.has_function('io_uring_register_ring_fd', prefix: '#include <liburing.h>', dependencies:linux_io_uring)) config_host_data.set('CONFIG_LIBPMEM', libpmem.found()) config_host_data.set('CONFIG_NUMA', numa.found()) config_host_data.set('CONFIG_OPENGL', opengl.found()) |