Phoronix: Linux Kernel Gets Hot-Data Tracking

Patches continue to be developed for the Linux kernel that provide hot-data tracking support for file-systems. This hot-data tracking feature may lead to performance improvements when dealing with commonly used data on the disk. Currently this feature has been developed with Btrfs in mind, but could be adapted to other Linux file-systems...

http://www.phoronix.com/vr.php?view=MTIwMzY