depmod memory usage.

[Dave Jones]

I pulled out an older laptop last night to test something, and built
a kernel on it.  When I did the make install part, the machine almost
ground to a halt.

It turned out that depmod used at peak 1.7GB of memory, (the laptop only had 1GB,
so it was swapping to the point of locking up interactivity for minutes
at a time).  It took an hour to complete.

The config file is pretty pathological (it's a distro build, so tons of
modules -- http://codemonkey.org.uk/junk/fedora-config-x86-64)

It's been a while since I built on a machine with this amount of memory,
but it seems that depmod has taken a big step backwards as it used to
cope with this just fine.

This is with the m-i-t that shipped in Fedora 16 (3.16)

	Dave

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