MEMMAN_INCR_SIZE
alloc_size = roundup(bmp->size * MEMMAN_INCR_SIZE,
memman->required_mem += bmp->size * MEMMAN_INCR_SIZE;
if (manage_block(memman, id, block, 0, MEMMAN_INCR_SIZE)) {
#if !defined(MEMMAN_INCR_SIZE) || MEMMAN_INCR_SIZE < 512