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The netmgr, has an internal cache for freed active handles. This cache was allocated using isc_mem_allocate()/isc_mem_free() API because it was simpler to reallocate the cache when we needed to grow it. The new isc_mem_reget() function could be used here reducing the need to use isc_mem_allocate() API which is tad bit slower than isc_mem_get() API.