> On Tue, Feb 16, 2010 at 04:03:29PM +0900, KOSAKI Motohiro wrote: > > > Unusuable free space index is a measure of external fragmentation that > > > takes the allocation size into account. For the most part, the huge page > > > size will be the size of interest but not necessarily so it is exported > > > on a per-order and per-zone basis via /proc/pagetypeinfo. > > > > Hmmm.. > > /proc/pagetype have a machine unfriendly format. perhaps, some user have own ugly > > /proc/pagetype parser. It have a little risk to break userland ABI. > > > > It's very low risk. I doubt there are machine parsers of > /proc/pagetypeinfo because there are very few machine-orientated actions > that can be taken based on the information. It's more informational for > a user if they were investigating fragmentation problems. > > > I have dumb question. Why can't we use another file? > > I could. What do you suggest? I agree it's low risk. but personally I hope fragmentation ABI keep very stable because I expect some person makes userland compaction daemon. (read fragmentation index from /proc and write /proc/compact_memory if necessary). then, if possible, I hope fragmentation info have individual /proc file. -- 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>