Lazyfree: pending objects count in INFO output.

src/lazyfree.c

@@ -6,6 +6,11 @@
 static size_t lazyfree_objects = 0;
 pthread_mutex_t lazyfree_objects_mutex = PTHREAD_MUTEX_INITIALIZER;
 
+/* Return the number of currently pending objects to free. */
+size_t lazyfreeGetPendingObjectsCount(void) {
+    return lazyfree_objects;
+}
+
 /* Return the amount of work needed in order to free an object.
  * The return value is not always the actual number of allocations the
  * object is compoesd of, but a number proportional to it.

src/server.c

@@ -2803,7 +2803,8 @@ sds genRedisInfoString(char *section) {
             "maxmemory_human:%s\r\n"
             "maxmemory_policy:%s\r\n"
             "mem_fragmentation_ratio:%.2f\r\n"
-            "mem_allocator:%s\r\n",
+            "mem_allocator:%s\r\n"
+            "lazyfree_pending_objects:%zu\r\n",
             zmalloc_used,
             hmem,
             server.resident_set_size,
@@ -2818,7 +2819,8 @@ sds genRedisInfoString(char *section) {
             maxmemory_hmem,
             evict_policy,
             zmalloc_get_fragmentation_ratio(server.resident_set_size),
-            ZMALLOC_LIB
+            ZMALLOC_LIB,
+            lazyfreeGetPendingObjectsCount()
             );
     }
 

src/server.h

@@ -1414,6 +1414,7 @@ void slotToKeyFlush(void);
 int dbAsyncDelete(redisDb *db, robj *key);
 void emptyDbAsync(redisDb *db);
 void slotToKeyFlushAsync(void);
+size_t lazyfreeGetPendingObjectsCount(void);
 
 /* API to get key arguments from commands */
 int *getKeysFromCommand(struct redisCommand *cmd, robj **argv, int argc, int *numkeys);