Function activeDefragAlloc

app/redis-6.2.6/src/defrag.c:56–71

Defrag helper for generic allocations. * * returns NULL in case the allocation wasn't moved. * when it returns a non-null value, the old pointer was already released * and should NOT be accessed. */

 * when it returns a non-null value, the old pointer was already released
 * and should NOT be accessed. */
void* activeDefragAlloc(void *ptr) {
    size_t size;
    void *newptr;
    if(!je_get_defrag_hint(ptr)) {
        server.stat_active_defrag_misses++;
        return NULL;
    }
    /* move this allocation to a new allocation.
     * make sure not to use the thread cache. so that we don't get back the same
     * pointers we try to free */
    size = zmalloc_size(ptr);
    newptr = zmalloc_no_tcache(size);
    memcpy(newptr, ptr, size);
    zfree_no_tcache(ptr);
    return newptr;
}

/*Defrag helper for sds strings
 *