On Thu, 11 Feb 2010, Mel Gorman wrote: > > free_area_init_nodes() emits pfn ranges for all zones on the system. > > There may be no pages on a higher zone, however, due to memory > > limitations or the use of the mem= kernel parameter. For example: > > > > Zone PFN ranges: > > DMA 0x00000001 -> 0x00001000 > > DMA32 0x00001000 -> 0x00100000 > > Normal 0x00100000 -> 0x00100000 > > > > The implementation copies the previous zone's highest pfn, if any, as the > > next zone's lowest pfn. If its highest pfn is then greater than the > > amount of addressable memory, the upper memory limit is used instead. > > Thus, both the lowest and highest possible pfn for higher zones without > > memory may be the same. > > > > The output is now suppressed for zones that do not have a valid pfn > > range. > > > > I see no problem with the patch. Was it a major problem or just > confusing? > It was just confusing, I don't think anybody would be parsing the kernel log for this specifically to determine whether ZONE_NORMAL exists :) > > Cc: Mel Gorman <mel@xxxxxxxxx> > > Signed-off-by: David Rientjes <rientjes@xxxxxxxxxx> > > Reviewed-by: Mel Gorman <mel@xxxxxxxxx> > Thanks! -- 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/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>