Another data point for this thread:
Running a 64-bit kernel with a 32-bit userland is a common practice on
non-x86 platforms, and non-Linux OS's. For a lot of tasks, you simply
do not need 64-bit pointers and a 64-bit process address space. Both
executable code and in-memory data structures tend to be smaller on 32-bit.
cp(1), for example, can be 32-bit as long as it supports O_LARGEFILE and
off64_t.
Jeff
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