Add support for missing LRU and LFU APIs

[gkorland]

Key eviction API

RedisModule_SetLRU

int RedisModule_SetLRU(RedisModuleKey *key, mstime_t lru_idle);
Available since: 6.0.0

Set the key last access time for LRU based eviction. not relevant if the servers's maxmemory policy is LFU based. Value is idle time in milliseconds. returns REDISMODULE_OK if the LRU was updated, REDISMODULE_ERR otherwise.

RedisModule_GetLRU

int RedisModule_GetLRU(RedisModuleKey *key, mstime_t *lru_idle);
Available since: 6.0.0

Gets the key last access time. Value is idletime in milliseconds or -1 if the server's eviction policy is LFU based. returns REDISMODULE_OK if when key is valid.

RedisModule_SetLFU

int RedisModule_SetLFU(RedisModuleKey *key, long long lfu_freq);
Available since: 6.0.0

Set the key access frequency. only relevant if the server's maxmemory policy is LFU based. The frequency is a logarithmic counter that provides an indication of the access frequencyonly (must be <= 255). returns REDISMODULE_OK if the LFU was updated, REDISMODULE_ERR otherwise.

RedisModule_GetLFU

int RedisModule_GetLFU(RedisModuleKey *key, long long *lfu_freq);
Available since: 6.0.0

Gets the key access frequency or -1 if the server's eviction policy is not LFU based. returns REDISMODULE_OK if when key is valid.