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

On Mon, 2012-03-19 at 08:53 -0500, Christoph Lameter wrote:

On Fri, 16 Mar 2012, Peter Zijlstra wrote:

quoted

quoted

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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?

Not sure that's really a win, the behaviour would be the same we just
have to implement another policy, which is likely more code.

A HOME_NODE policy would also help to ensure that existing applications
continue to work as expected. Given that people in the HPC industry and
elsewhere have been fine tuning around the scheduler for years this is a
desirable goal and ensures backward compatibility.

I really have no idea what you're saying. Existing applications that use
mbind/set_mempolicy already continue to function exactly like before,
see how the new layer is below all that.


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