On Tue, Nov 09, 2010 at 12:18:49PM +0900, KOSAKI Motohiro wrote: > I'm talking very personal thing now. I'm usually testing both feature. > Then, runtime switching makes my happy :-) > However I don't know what are you and Mel talking and agree about this. > So, If many developer prefer this approach, I don't oppose anymore. Mel seem to still prefer I allow lumpy for hugetlbfs with a __GFP_LUMPY specified only for hugetlbfs. But he measured compaction is more reliable than lumpy at creating hugepages so he seems to be ok with this too. > But, I bet almost all distro choose CONFIG_COMPACTION=y. then, lumpy code > will become nearly dead code. So, I like just kill than dead code. however > it is also only my preference. ;) Killing dead code is my preference too indeed. But then it's fine with me to delete it only later. In short this is least intrusive modification I could make to the VM that wouldn't than hang the system when THP is selected because all pte young bits are ignored for >50% of page reclaim invocations like lumpy requires. -- 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/ . Fight unfair telecom policy in Canada: sign http://dissolvethecrtc.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>