Re: [RFC][PATCH 10/26] mm, mpol: Make mempolicy home-node aware

Christoph Lameter
2012-03-16T18:35:16Z

On Fri, 16 Mar 2012, Peter Zijlstra wrote:

> Add another layer of fallback policy to make the home node concept
> useful from a memory allocation PoV.
>
> This changes the mpol order to:
>
> - vma->vm_ops->get_policy [if applicable]
> - vma->vm_policy [if applicable]
> - task->mempolicy
> - tsk_home_node() preferred [NEW]
> - default_policy
>
> Note that the tsk_home_node() policy has Migrate-on-Fault enabled to
> facilitate efficient on-demand memory migration.

The numa hierachy is already complex. Could we avoid adding another layer
by adding a MPOL_HOME_NODE and make that the default?