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Put more details in the comment introduced by #4601.

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antirez 2018-01-15 12:50:08 +01:00
parent 1ed5ac7ce5
commit c45366be0a
1 changed files with 8 additions and 3 deletions
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11
src/lazyfree.c
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@ -64,9 +64,14 @@ int dbAsyncDelete(redisDb *db, robj *key) {
robj *val = dictGetVal(de); robj *val = dictGetVal(de);
size_t free_effort = lazyfreeGetFreeEffort(val); size_t free_effort = lazyfreeGetFreeEffort(val);
/* If releasing the object is too much work and the refcount /* If releasing the object is too much work, do it in the background
* is 1, that means the object really needs to be freed, * by adding the object to the lazy free list.
* let's put it into the lazy free list. */ * Note that if the object is shared, to reclaim it now it is not
* possible. This rarely happens, however sometimes the implementation
* of parts of the Redis core may call incrRefCount() to protect
* objects, and then call dbDelete(). In this case we'll fall
* through and reach the dictFreeUnlinkedEntry() call, that will be
* equivalent to just calling decrRefCount(). */
if (free_effort > LAZYFREE_THRESHOLD && val->refcount == 1) { if (free_effort > LAZYFREE_THRESHOLD && val->refcount == 1) {
atomicIncr(lazyfree_objects,1); atomicIncr(lazyfree_objects,1);
bioCreateBackgroundJob(BIO_LAZY_FREE,val,NULL,NULL); bioCreateBackgroundJob(BIO_LAZY_FREE,val,NULL,NULL);