return mem to os

include/os/osMemory.h

@@ -36,6 +36,7 @@ void   *taosMemoryStrDup(const char *ptr);
 void    taosMemoryFree(void *ptr);
 int64_t taosMemorySize(void *ptr);
 void    taosPrintBackTrace();
+void    taosMemoryTrim(int32_t size);
 
 #define taosMemoryFreeClear(ptr)   \
   do {                             \

source/dnode/mgmt/mgmt_dnode/src/dmWorker.c

@@ -28,6 +28,7 @@ static void *dmStatusThreadFp(void *param) {
     int64_t curTime = taosGetTimestampMs();
     float   interval = (curTime - lastTime) / 1000.0f;
     if (interval >= tsStatusInterval) {
+      taosMemoryTrim(0); 
       dmSendStatusReq(pMgmt);
       lastTime = curTime;
     }

source/os/src/osMemory.c

@@ -336,3 +336,7 @@ int64_t taosMemorySize(void *ptr) {
 #endif
 #endif
 }
+
+void taosMemoryTrim(int32_t size) {
+    malloc_trim(size);
+}