Dirty pages & low memory hangs with mmap

[Stephen Hocking-Senior Programmer PGS Tensor Perth]

I've been seeing an interesting problem when doing a make installworld on a 
486 with 16MB of memory. Immediately after installing libc.so.3, it will hang. 
DDB gives a backtrace to a mmap related call (sorry, the box is at home at the 
memoment and this email was prompted by something on freebsd-current). It's 
quite reproducible, but worked around by issuing a bunch of syncs every 
second. Outside of that, the box runs fine (it's my ppp NAT gateway, runs 
squid & nntpcached as well).


        Stephen
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