Re: Re: Re: Re: [PATCH v1] sched/numa: add per-process numa_balancing

[Gang Li]

On 11/9/21 5:19 PM, Mel Gorman wrote:
> On Tue, Nov 09, 2021 at 04:28:28PM +0800, Gang Li wrote:
> > If the global tuning affects default behaviour and the prctl
> > affects specific behaviour.  Then when prctl specifies
> > numa_balancing for a process, there is no way for the
> > global tuning to affect that process.
>
> While I think it's very likely that the common case will be to disable
> NUMA balancing for specific processes,
> prctl(PR_NUMA_BALANCING,PR_SET_NUMA_BALANCING,1) should still be
> meaningful.

I'm still a bit confused.

If we really want to enable/disable numa_balancing for all processes, 
but some of them override the global numa_balancing using prctl, what 
should we do?

Do we iterate through these processes to enable/disable them individually?