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| 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 /hw/core | |
| parent | 9e4067b8a41514c8f5715a2c735c3ac03e5d70c8 (diff) | |
| download | qemu-e2848bc574fe2715c694bf8fe9a1ba7f78a1125a.zip qemu-e2848bc574fe2715c694bf8fe9a1ba7f78a1125a.tar.gz qemu-e2848bc574fe2715c694bf8fe9a1ba7f78a1125a.tar.bz2 | |
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 'hw/core')
0 files changed, 0 insertions, 0 deletions