:> > The first is mremap().
:>
:> What does this function do? Is the function used by freely available
:> software, if so can you give some examples.
:
:http://www.freebsd.org/cgi/man.cgi?query=mremap&apropos=0&sektion=0&manpath=Red+Hat+Linux%2Fi386+5.2&format=html
mremap() is idiotic and sounds like a cop-out for a badly designed
memory allocator. There are much better ways to manage memory depending
on what you want to do. For one thing, don't forget that it is perfectly
legal to mmap() a larger size then the underlying file - you just can't
access the space beyond the file EOF until you have extended the file
by other means. It is also perfectly legal to mmap() a large chunk of
anonymous memory, like a megabyte, and grow into it. No memory is
actually allocated until you touch it. Generally speaking, there are
very limited uses to being able to remap anonymous (not file-backed)
memory, and remapping file-backed memory is trivial (just an
munmap()/mmap() pair).
-Matt
Matthew Dillon
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