redis lru实现策略

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1. void databasesCron(void){
   
2.    /* Expire keys by random sampling. Not required for slaves
   
3.     * as master will synthesize DELs for us. */
   
4.     if (server.active_expire_enabled && server.masterhost == NULL)
   
5.         activeExpireCycle(ACTIVE_EXPIRE_CYCLE_SLOW);
   
6.     …..
   
7. }

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1. processCommand 函数关于内存淘汰策略的逻辑:
   
2. /* Handle the maxmemory directive.
   
3. *
   
4. * First we try to free some memory if possible (if there are volatile
   
5. * keys in the dataset). If there are not the only thing we can do
   
6. * is returning an error. */
   
7. if (server.maxmemory) {
   
8. int retval = freeMemoryIfNeeded();
   
9. /* freeMemoryIfNeeded may flush slave output buffers. This may result
   
10. * into a slave, that may be the active client, to be freed. */
    
11. if (server.current_client == NULL) return C_ERR;
    
12. 
    
13. /* It was impossible to free enough memory, and the command the client
    
14. * is trying to execute is denied during OOM conditions? Error. */
    
15. if ((c->cmd->flags & CMD_DENYOOM) && retval == C_ERR) {
    
16. flagTransaction(c);
    
17. addReply(c, shared.oomerr);
    
18. return C_OK;
    
19. }
    
20. }

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