Re: [RFC PATCH v2 3/5] padata: dispatch works on different nodes

[Gang Li]

Hi Tim,

According to queue_work_node, if there are no CPUs available on the
given node, it will schedule to any available CPU.

On 2023/12/18 14:46, Gang Li wrote:
> On 2023/12/13 07:40, Tim Chen wrote:
> > >       list_for_each_entry(pw, &works, pw_list)
> > > -        queue_work(system_unbound_wq, &pw->pw_work);
> > > +        if (job->numa_aware)
> > > +            queue_work_node((++nid % num_node_state(N_MEMORY)),
> >
> > The nid may fall on a NUMA node with only memory but no CPU.  In that 
> > case you
> > may still put the work on the unbound queue. You could end up on one 
> > CPU node for work
> > from all memory nodes without CPU. Is this what you want?  Or you would
> > like to spread them between CPU nodes?
> >
> > Tim
>
> Hi, thank you for your reminder. My intention was to fully utilize all
> memory bandwidth.
>
> For memory nodes without CPUs, I also hope to be able to spread them on
> different CPUs.