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

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