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Object approximated LRU algorithm enhanced / fixed / refactored. This is used for the VM currently but will soon be used for maxmemory expiring.

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antirez
2010-10-14 13:52:58 +02:00
parent b4f2e412d0
commit ef59a8bc9e
6 changed files with 41 additions and 23 deletions
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31
src/object.c
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@ -19,14 +19,19 @@ robj *createObject(int type, void *ptr) {
o->encoding = REDIS_ENCODING_RAW;
o->ptr = ptr;
o->refcount = 1;
if (server.vm_enabled) {
/* Note that this code may run in the context of an I/O thread
* and accessing server.lruclock in theory is an error
* (no locks). But in practice this is safe, and even if we read
* garbage Redis will not fail. */
o->lru = server.lruclock;
o->storage = REDIS_VM_MEMORY;
}
/* Set the LRU to the current lruclock (minutes resolution).
* We do this regardless of the fact VM is active as LRU is also
* used for the maxmemory directive when Redis is used as cache.
*
* Note that this code may run in the context of an I/O thread
* and accessing server.lruclock in theory is an error
* (no locks). But in practice this is safe, and even if we read
* garbage Redis will not fail. */
o->lru = server.lruclock;
/* The following is only needed if VM is active, but since the conditional
* is probably more costly than initializing the field it's better to
* have every field properly initialized anyway. */
o->storage = REDIS_VM_MEMORY;
return o;
}
@ -433,3 +438,13 @@ char *strEncoding(int encoding) {
default: return "unknown";
}
}
/* Given an object returns the min number of seconds the object was never
* requested, using an approximated LRU algorithm. */
unsigned long estimateObjectIdleTime(robj *o) {
if (server.lruclock >= o->lru) {
return (server.lruclock - o->lru) * 60;
} else {
return ((REDIS_LRU_CLOCK_MAX - o->lru) + server.lruclock) * 60;
}
}