Re: [PATCH -V6 RESEND 1/3] numa balancing: Migrate on fault among multiple bound nodes

[Mel Gorman]

On Wed, Dec 02, 2020 at 04:42:32PM +0800, Huang Ying wrote:
> Now, NUMA balancing can only optimize the page placement among the
> NUMA nodes if the default memory policy is used.  Because the memory
> policy specified explicitly should take precedence.  But this seems
> too strict in some situations.  For example, on a system with 4 NUMA
> nodes, if the memory of an application is bound to the node 0 and 1,
> NUMA balancing can potentially migrate the pages between the node 0
> and 1 to reduce cross-node accessing without breaking the explicit
> memory binding policy.
> 

Ok, I think this part is ok and while the test case is somewhat
superficial, it at least demonstrated that the NUMA balancing overhead
did not offset any potential benefit

Acked-by: Mel Gorman <mgorman@xxxxxxx>

-- 
Mel Gorman
SUSE Labs