how to reproduce the problem:
I want to know:
how to config swap or vm to make redis able to swap more objects out ?
I have read the similar issue 394 http://code.google.com/p/redis/issues/detail?id=394
but did'nt catch some useful solves
Fix makefile dependencies for protobuf files (#442)
Merge review 386 by @srh (Closes #442)