Function updateMaxmemory

app/redis-6.2.6/src/config.c:2253–2264

}

static int updateMaxmemory(long long val, long long prev, const char **err) {
    UNUSED(prev);
    UNUSED(err);
    if (val) {
        size_t used = zmalloc_used_memory()-freeMemoryGetNotCountedMemory();
        if ((unsigned long long)val < used) {
            serverLog(LL_WARNING,"WARNING: the new maxmemory value set via CONFIG SET (%llu) is smaller than the current memory usage (%zu). This will result in key eviction and/or the inability to accept new write commands depending on the maxmemory-policy.", server.maxmemory, used);
        }
        performEvictions();
    }
    return 1;
}

static int updateGoodSlaves(long long val, long long prev, const char **err) {
    UNUSED(val);