Function imalloc_sample

app/redis-6.2.6/deps/jemalloc/src/jemalloc.c:1713–1742

}

JEMALLOC_ALWAYS_INLINE void *
imalloc_sample(static_opts_t *sopts, dynamic_opts_t *dopts, tsd_t *tsd,
    size_t usize, szind_t ind) {
	void *ret;

	/*
	 * For small allocations, sampling bumps the usize.  If so, we allocate
	 * from the ind_large bucket.
	 */
	szind_t ind_large;
	size_t bumped_usize = usize;

	if (usize <= SMALL_MAXCLASS) {
		assert(((dopts->alignment == 0) ? sz_s2u(LARGE_MINCLASS) :
		    sz_sa2u(LARGE_MINCLASS, dopts->alignment))
		    == LARGE_MINCLASS);
		ind_large = sz_size2index(LARGE_MINCLASS);
		bumped_usize = sz_s2u(LARGE_MINCLASS);
		ret = imalloc_no_sample(sopts, dopts, tsd, bumped_usize,
		    bumped_usize, ind_large);
		if (unlikely(ret == NULL)) {
			return NULL;
		}
		arena_prof_promote(tsd_tsdn(tsd), ret, usize);
	} else {
		ret = imalloc_no_sample(sopts, dopts, tsd, usize, usize, ind);
	}

	return ret;
}

/*
 * Returns true if the allocation will overflow, and false otherwise.  Sets