Custom malloc/mmap for x86_64

[Mike Frysinger]

so you just want to override the malloc implementation ?  glibc is specifically 
designed to allow that at runtime today.

if you create a shared library that exports these functions:
	malloc calloc realloc memalign free

you can use it with LD_PRELOAD and both glibc and your own code will use the 
custom allocator functions on the fly.  then to switch back to the stock glibc 
ones, unset LD_PRELOAD.
-mike
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