On Wed, 2008-06-04 at 21:51 +0200, Andrea Arcangeli wrote: > > Dave mentioned that SetPageReserved() doesn't necessarily get called > for > > zones with bad alignment. > > What does 'bad alignment' mean? Buddy was used to require each zone to > start at 1<<MAX_ORDER naturally aligned physical address (any ram > before the alignment was wasted). In any case all 'struct page' where > pfn_valid would return true, should start with PG_reserved set, if > it's not the case it should be fixed I guess.
I was thinking of the case where you have a large sparsemem section size, and a zone which is smaller. Say you have a 1GB SECTION_SIZE and a single 512MB zone. You'll get a true pfn_valid() for the 512MB that isn't in the zone since the mem_map[] is actually larger than the zone. But, since memmap_init_zone() is the one responsible for setting PageReserved(), I don't think anybody will set PageReserved() on that top 512MB. -- Dave -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
