> 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. Ah, I thought this series only has manua migration (i.e. MPOL_MF_LAZY), but it also has automatic migration if a page is not mapped. So my standpoint is, manual lazy migration has certinally usecase. but I have no opinion against automatic one. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom policy in Canada: sign http://dissolvethecrtc.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>