Re: [PATCH v6 1/6] mm/mempolicy: Add MPOL_PREFERRED_MANY for multiple preferred nodes

[Michal Hocko]

On Thu 29-07-21 23:12:42, Feng Tang wrote:
> On Thu, Jul 29, 2021 at 03:38:44PM +0200, Michal Hocko wrote:
[...]
> > Also the
> > semantic to give nodes some ordering based on their numbers sounds
> > rather weird to me.
> 
> I agree, and as I admitted in the first reply, this need to be fixed.

OK. I was not really clear that we are on the same page here.

> > The semantic I am proposing is to allocate from prefered nodes in
> > distance order starting from the local node.
> 
> So the plan is:
> * if the local node is set in 'prefer-many's nodemask, then chose
> * otherwise chose the node with the shortest distance to local node
> ?

Yes and what I am trying to say is that you will achieve that simply by
doing the following in policy_node:
	if (policy->mode == MPOL_PREFERRED_MANY)
		return nd;
-- 
Michal Hocko
SUSE Labs