Hi,
This is another proposal that unifies bpf_mtap and
if_ipackets++, which are executed in each driver now,
into the percpuq if_input framework.
The benefits of the change are:
- We can reduce codes
- We can provide the same behavior between drivers
- How if_ipackets is counted up
- Well, ac
co...@sdf.org writes:
>It appears that many "big name" drivers (wd, nvme) do
>not have d_flags D_MPSAFE, unless I am reading things
>wrong.
Yes, many drivers aren't MPSAFE and need the kernel lock.
The nvme (cdev) driver is just the control channel. While finally
everything should be MPSAFE, it'
co...@sdf.org writes:
> Hi!
>
> Poking around I noticed KERNEL_LOCK is occasionally
> grabbed by cdev_* for noticeable periods of time.
>
> Looking at the code, it grabs DEV_LOCK which is effectively
> KERNEL_LOCK if the driver is not declared MPSAFE.
>
> It appears that many "big name" drivers
Hi!
Poking around I noticed KERNEL_LOCK is occasionally
grabbed by cdev_* for noticeable periods of time.
Looking at the code, it grabs DEV_LOCK which is effectively
KERNEL_LOCK if the driver is not declared MPSAFE.
It appears that many "big name" drivers (wd, nvme) do
not have d_flags D_MPSAFE,
