Re: [PATCH 3/4] amd/amdkfd: WQ_PERCPU added to alloc_workqueue users

[Philip Yang]

On 2025-10-31 04:48, Marco Crivellari wrote:
> On Thu, Oct 30, 2025 at 6:15 PM Christian König
> <christian.koenig@xxxxxxx> wrote:
> > [...]
> > Adding Philip and Felix to comment, but this should most likely also not execute on the same CPU as the one who scheduled the work.
> Hi Christian,
>
> The actual behavior without WQ_PERCPU is exactly the same: with 0 it
> means the workqueue is per-cpu. We just enforced that, adding the
> WQ_PERCPU flag, so that it is explicit.
>
> So if you need this to be unbound, I can send the v2 with WQ_UNBOUND
> instead of WQ_PERCPU.
Hi,

WQ_UNBOUND is more appropriate here, to execute the KFD release work immediately as long as CPU resource is available, not specific to the CPU that kfd_unref_process the last process refcount.

Thanks,
Philip

> Thanks!
>
> --
>
> Marco Crivellari
>
> L3 Support Engineer, Technology & Product