That has definitely helped me past that debacle, but now I have another:

	USER  PID %CPU  %MEM    VSZ    RSS TT  STAT STARTED       TIME COMMAND
	root  138 30.2 148.0 129512 194032 ??  R     9:56PM   14:53.35 foo

148%, huh?  Well, sure enough, dmesg agrees that we only have 128MB:

	real mem  = 133824512
	avail mem = 123363328
	using 1659 buffers containing 6795264 bytes of memory

This makes an RSS of 194MB deeply suspicious.  (Which it is anyway given that
I told the application to hold its memory use down to 50MB or so.)

I'm not presently using MMAP since it didn't work very well.  Help?