Function dictExpandAllowed

app/redis-6.2.6/src/server.c:1360–1366

Return 1 if currently we allow dict to expand. Dict may allocate huge * memory to contain hash buckets when dict expands, that may lead redis * rejects user's requests or evicts some keys, we can stop dict to expand * provisionally if used memory will be over maxmemory after dict expands, * but to guarantee the performance of redis, we still allow dict to expand * if dict load factor exceeds

 * but to guarantee the performance of redis, we still allow dict to expand
 * if dict load factor exceeds HASHTABLE_MAX_LOAD_FACTOR. */
int dictExpandAllowed(size_t moreMem, double usedRatio) {
    if (usedRatio <= HASHTABLE_MAX_LOAD_FACTOR) {
        return !overMaxmemoryAfterAlloc(moreMem);
    } else {
        return 1;
    }
}

/* Generic hash table type where keys are Redis Objects, Values
 * dummy pointers. */