diff --git a/controller/controller.go b/controller/controller.go
index 3029102d..9023f9d1 100644
--- a/controller/controller.go
+++ b/controller/controller.go
@@ -10,6 +10,7 @@ import (
 	"os"
 	"path"
 	"runtime"
+	"runtime/debug"
 	"strings"
 	"sync"
 	"time"
@@ -552,7 +553,8 @@ func (c *Controller) command(msg *server.Message, w io.Writer) (res string, d co
 	case "aofmd5":
 		res, err = c.cmdAOFMD5(msg)
 	case "gc":
-		go runtime.GC()
+		runtime.GC()
+		debug.FreeOSMemory()
 		res = server.OKMessage(msg, time.Now())
 	case "aofshrink":
 		go c.aofshrink()
diff --git a/controller/stats.go b/controller/stats.go
index 1ca933f4..ab2cab15 100644
--- a/controller/stats.go
+++ b/controller/stats.go
@@ -4,6 +4,7 @@ import (
 	"bytes"
 	"encoding/json"
 	"fmt"
+	"os"
 	"runtime"
 	"sort"
 	"strings"
@@ -80,6 +81,7 @@ func (c *Controller) cmdServer(msg *server.Message) (res string, err error) {
 		m["following"] = fmt.Sprintf("%s:%d", c.config.FollowHost, c.config.FollowPort)
 		m["caught_up"] = c.fcup
 	}
+	m["pid"] = os.Getpid()
 	m["aof_size"] = c.aofsz
 	m["num_collections"] = c.cols.Len()
 	m["num_hooks"] = len(c.hooks)
@@ -111,6 +113,7 @@ func (c *Controller) cmdServer(msg *server.Message) (res string, err error) {
 	}
 	m["mem_alloc"] = mem.Alloc
 	m["heap_size"] = mem.HeapAlloc
+	m["heap_released"] = mem.HeapReleased
 	m["max_heap_size"] = c.config.MaxMemory
 	m["avg_item_size"] = avgsz
 	m["pointer_size"] = (32 << uintptr(uint64(^uintptr(0))>>63)) / 8