Hi Mel,

On 09/10/2013 05:31 PM, Mel Gorman wrote:

It has been a long time since V6 of this series and time for an update. Much
of this is now stabilised with the most important addition being the inclusion
of Peter and Rik's work on grouping tasks that share pages together.

This series has a number of goals. It reduces overhead of automatic balancing
through scan rate reduction and the avoidance of TLB flushes. It selects a
preferred node and moves tasks towards their memory as well as moving memory
toward their task. It handles shared pages and groups related tasks together.

I found sometimes numa balancing will be broken after khugepaged
started, because khugepaged always allocate huge page from the node of
the first scanned normal page during collapsing.

A simple use case is when a user run his application interleaving all
nodes using "numactl --interleave=all xxxx".
But after khugepaged started most pages of his application will be
located to only one specific node.

I have a simple patch fix this issue in thread:
[PATCH 2/2] mm: thp: khugepaged: add policy for finding target node

I think this may related with this topic, I don't know whether this
series can also fix the issue I mentioned.

-- 
Regards,
-Bob

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