Re: [RFC PATCH 0/8][Sorted-buddy] mm: Linux VM Infrastructure to support Memory Power Management

[Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>]

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.

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