I did like this implementation and think it is valuable. I am experimenting with one of our HW. This type of partition does help in saving power. Our calculations shows significant saving of power per DIM with the help of some HW/BIOS changes. We are only talking about content preserving memory, so we don't have to be 100% correct. In my experiments, I tried two methods: - Similar to approach suggested by Mel Gorman. I have a special sticky migrate type like CMA. - Buddy buckets: Buddies are organized into memory region aware buckets. During allocation it prefers higher order buckets. I made sure that there is no affect of my change if there are no power saving memory DIMs. The advantage of this bucket is that I can keep the memory in close proximity for a related task groups by direct hashing to a bucket. The free list if organized as two dimensional array with bucket and migrate type for each order. In both methods, currently reclaim is targeted to be done by a sysfs interface similar to memory compaction for a node allowing user space to initiate reclaim. Thanks, Srinivas Pandruvada Open Source Technology Center, Intel Corp. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>