Very aggressive memory reclaim

[KOSAKI Motohiro]

> Recently, We had a similar issue.
> http://www.spinics.net/lists/linux-mm/msg12243.html
> But it seems to not merge. I don't know why since I didn't follow up the thread.
> Maybe Cced guys can help you.
> 
> Is it a sudden big cache drop at the moment or accumulated small cache
> drop for long time?
> What's your zones' size?
> 
> Please attach the result of cat /proc/zoneinfo for others.

If my remember is correct, 2.6.38 is included Mel's anti agressive 
reclaim patch. And original report seems to be using 2.6.37.x. 

John, can you try 2.6.38?