Re: [PATCH 00/10] workqueue: break affinity initiatively

[Lai Jiangshan]

On Tue, Dec 15, 2020 at 3:50 PM Peter Zijlstra <peterz@xxxxxxxxxxxxx> wrote:
>
> On Tue, Dec 15, 2020 at 01:44:53PM +0800, Lai Jiangshan wrote:
> > I don't know how the scheduler distinguishes all these
> > different cases under the "new assumption".
>
> The special case is:
>
>   (p->flags & PF_KTHREAD) && p->nr_cpus_allowed == 1
>
>

So unbound per-node workers can possibly match this test. So there is code
needed to handle for unbound workers/pools which is done by this patchset.

Is this the code of is_per_cpu_kthread()? I think I should have also
used this function in workqueue and don't break affinity for unbound
workers have more than 1 cpu.