Function updateLFU

app/redis-6.2.6/src/db.c:54–58

Update LFU when an object is accessed. * Firstly, decrement the counter if the decrement time is reached. * Then logarithmically increment the counter, and update the access time. */

 * Firstly, decrement the counter if the decrement time is reached.
 * Then logarithmically increment the counter, and update the access time. */
void updateLFU(robj *val) {
    unsigned long counter = LFUDecrAndReturn(val);
    counter = LFULogIncr(counter);
    val->lru = (LFUGetTimeInMinutes()<<8) | counter;
}

/* Low level key lookup API, not actually called directly from commands
 * implementations that should instead rely on lookupKeyRead(),