From a98369929e250e94240f719abcf1d6e1255202a9 Mon Sep 17 00:00:00 2001 From: antirez Date: Thu, 20 Mar 2014 17:56:27 +0100 Subject: [PATCH] Use 24 bits for the lru object field and improve resolution. There were 2 spare bits inside the Redis object structure that are now used in order to enlarge 4x the range of the LRU field. At the same time the resolution was improved from 10 to 1 second: this still provides 194 days before the LRU counter overflows (restarting from zero). This is not a problem since it only causes lack of eviction precision for objects not touched for a very long time, and the lack of precision is only temporary. --- src/redis.h | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/src/redis.h b/src/redis.h index 8103527ee..c14a29607 100644 --- a/src/redis.h +++ b/src/redis.h @@ -382,12 +382,11 @@ typedef long long mstime_t; /* millisecond time type. */ /* A redis object, that is a type able to hold a string / list / set */ /* The actual Redis Object */ -#define REDIS_LRU_BITS 22 +#define REDIS_LRU_BITS 24 #define REDIS_LRU_CLOCK_MAX ((1<lru */ -#define REDIS_LRU_CLOCK_RESOLUTION 10000 /* LRU clock resolution in ms */ +#define REDIS_LRU_CLOCK_RESOLUTION 1000 /* LRU clock resolution in ms */ typedef struct redisObject { unsigned type:4; - unsigned notused:2; /* Not used */ unsigned encoding:4; unsigned lru:REDIS_LRU_BITS; /* lru time (relative to server.lruclock) */ int refcount;