malloc: performance improvements and bugfixes

[Szabolcs Nagy]

On 27/01/16 17:38, Jörn Engel wrote:
> Another btw, I created my own testcases because it was less painful to
> do so than to extract testcases from libc, tcmalloc or jemalloc.  Not
> that I am setting a good example, but clearly none of these projects
> care about some other allocator reusing their testcases.

i had similar experience with libc testing in general,
musl only has a few trivial benchmarks
http://git.musl-libc.org/cgit/libc-bench/tree/malloc.c

your code looks useful