On Tue, 2008-11-04 at 16:35 +0100, Rafael J. Wysocki wrote: > On Tuesday, 4 of November 2008, Dave Hansen wrote: > > On Tue, 2008-11-04 at 09:54 +0100, Rafael J. Wysocki wrote: > > > To handle this, I need to know two things: > > > 1) what changes of the zones are possible due to memory hotplugging > > > (i.e. can they grow, shring, change boundaries etc.) > > > > All of the above. > > OK > > If I allocate a page frame corresponding to specific pfn, is it guaranteed to > be associated with the same pfn in future? Page allocation is different. Since you hold a reference to a page, it can not be removed until you release that reference. That's why every normal alloc_pages() user in the kernel doesn't have to worry about memory hotplug. > > Why walk zones instead of pgdats? > > This is a historical thing rather than anything else. I think we could switch > to pgdats, but that would require a code rewrite that's likely to introduce > bugs, while our image-creating code is really well tested and doesn't change > very often. OK, fair enough. I just wanted you to know that there are options other than zones. -- Dave _______________________________________________ linux-pm mailing list linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/linux-pm
