Hi, In a discussion about SteamVR for Linux[0], users found out that modifying hidraw code would lead to more stable frame per seconds. This patch aims to fix a bottleneck at hidraw subsystem to increase the system throughput when using a lot of HIDs at same time. I created an artificial benchmark tool[1] to test this. It issues a lot of ioctls in parallel for 5 HID devices. While the original kernel took around 1570 nsecs to complete all the calls, after applying this patch it took around 412 nsecs, almost 4x faster. Thanks, André [0] https://github.com/ValveSoftware/SteamVR-for-Linux/issues/21 [1] https://gist.github.com/andrealmeid/b495999b8efce3c741e14a709a21e49b André Almeida (1): HID: hidraw: Replace hidraw device table mutex with a rwsem drivers/hid/hidraw.c | 34 +++++++++++++++++----------------- 1 file changed, 17 insertions(+), 17 deletions(-) -- 2.34.1
