Re: [PATCH/RFC 0/8] numa - Migrate-on-Fault

On Sun, 14 Nov 2010, KOSAKI Motohiro wrote:

> Nice!

Lets not get overenthused. There has been no conclusive proof that the
overhead introduced by automatic migration schemes is consistently less
than the benefit obtained by moving the data. Quite to the contrary. We
have over a decades worth of research and attempts on this issue and there
was no general improvement to be had that way.

The reason that the manual placement interfaces exist is because there was
no generally beneficial migration scheme available. The manual interfaces
allow the writing of various automatic migrations schemes in user space.

If wecan come up with something that is an improvement then lets go
this way but I am skeptical.