[summerofcode] Memory usage profile

[Cui Yuting]

Sorry for my poor English.

I have read the code idea of memory usage profile and have just read 
some of the source files. As far as my understanding, the goal of this 
idea is to track the memory and objects usage. I think this can be done 
by modifying the python core, but I don't know if it is needed to track 
every memory blocks allocated by the C module (for example, the array 
allocated by malloc or new). I think the later will be a very hard task.