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How many page flags do we really have?How many page flags do we really have?Posted Jun 7, 2009 9:33 UTC (Sun) by farnz (guest, #17727)In reply to: How many page flags do we really have? by giraffedata Parent article: How many page flags do we really have?
One difference is the size of lowmem. On a 32-bit system, those 4 bytes per page all come out of the first 896MB of physical RAM. On a 64-bit system, they come out of your total RAM. It's a lot easier to accept waste when it's not in such a tightly restricted block of memory; we already have problems with running low on lowmem on 32-bit systems with more than around 8GB RAM, which are best solved by going to 64-bit.
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