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device_manager: Avoid checking io_uring support when it's not needed

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After testing, io_uring_is_supported() causes about 38ms of
overhead when creating virtio-blk. By modifying the position
of io_uring_is_supported(), the overhead of creating virtio-blk
is reduced to less than 1ms when we close io_uring.

Signed-off-by: Jinrong Liang <cloudliang@tencent.com>
This commit is contained in:
Jinrong Liang 2022-10-27 18:52:57 +08:00 committed by Bo Chen
parent bc310bb173
commit cb171d4a23
1 changed files with 2 additions and 2 deletions
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4
vmm/src/device_manager.rs
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@ -2100,7 +2100,7 @@ impl DeviceManager {
ImageType::FixedVhd => {
// Use asynchronous backend relying on io_uring if the
// syscalls are supported.
if self.io_uring_is_supported() && !disk_cfg.disable_io_uring {
if !disk_cfg.disable_io_uring && self.io_uring_is_supported() {
info!("Using asynchronous fixed VHD disk file (io_uring)");
Box::new(
FixedVhdDiskAsync::new(file)
@ -2117,7 +2117,7 @@ impl DeviceManager {
ImageType::Raw => {
// Use asynchronous backend relying on io_uring if the
// syscalls are supported.
if self.io_uring_is_supported() && !disk_cfg.disable_io_uring {
if !disk_cfg.disable_io_uring && self.io_uring_is_supported() {
info!("Using asynchronous RAW disk file (io_uring)");
Box::new(RawFileDisk::new(file)) as Box<dyn DiskFile>
} else {