On Mon, Apr 12, 2010 at 04:22:30AM -0700, Arjan van de Ven wrote: > Now hugepages have some interesting other advantages, namely they save > pagetable memory..which for something like TPC-C on a fork based > database can be a measureable win. It doesn't save pagetable memory (as in `grep MemFree /proc/meminfo`). To achive that we'd need to return -ENOMEM from split_huge_page_pmd and split_huge_page, which would complicate things significantly. I'd prefer if we could get rid gradually of split_huge_page_pmd calls instead of having to handle a retval in several inner nested functions that don't contemplate returning error like all their callers. I think the saving in pagetables isn't really interesting... it's a couple of gigabytes but it doesn't move the needle as much as being able to boost CPU performance. -- 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>