(relinquish): Adjust page_break_value by amount of memory actually given back.
(r_alloc_sbrk): Provide hysteresis in relocating the blocs. (relinquish): Never free less than extra_bytes; keep extra_bytes of empty space. (obtain): Always get extra_bytes additional space. (r_alloc_init): Set extra_bytes and page_size. (ALIGNED, ROUNDUP, ROUND_TO_PAGE): Use page_size.
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