Re: [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:

[...]

quoted

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.

quoted

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