diff --git a/common.h b/common.h
index fe20834692..cf25fd5b0e 100644
--- a/common.h
+++ b/common.h
@@ -499,6 +499,8 @@ void  blas_set_parameter(void);
 int   blas_get_cpu_number(void);
 void *blas_memory_alloc  (int);
 void  blas_memory_free   (void *);
+void *blas_memory_alloc_nolock  (int); //use malloc without blas_lock
+void  blas_memory_free_nolock   (void *);
 
 int  get_num_procs (void);
 
diff --git a/driver/others/memory.c b/driver/others/memory.c
index 4010ec974c..12172fd80c 100644
--- a/driver/others/memory.c
+++ b/driver/others/memory.c
@@ -1161,6 +1161,16 @@ void blas_memory_free(void *free_area){
   return;
 }
 
+void *blas_memory_alloc_nolock(int unused) {
+  void *map_address;
+  map_address = (void *)malloc(BUFFER_SIZE + FIXED_PAGESIZE);
+  return map_address;
+}
+
+void blas_memory_free_nolock(void * map_address) {
+  free(map_address);
+}
+
 void blas_shutdown(void){
 
   int pos;
diff --git a/interface/gemv.c b/interface/gemv.c
index f33973ef3d..6b0aadca0c 100644
--- a/interface/gemv.c
+++ b/interface/gemv.c
@@ -211,15 +211,24 @@ void CNAME(enum CBLAS_ORDER order,
 #ifdef MAX_STACK_ALLOC
   // make it volatile because some gemv implementation (ex: dgemv_n.S)
   // do not restore all register
-  volatile int stack_alloc_size = m + n;
-  if(stack_alloc_size < 128)
+  volatile int stack_alloc_size = 0;
+  if (trans == 0) {
+    stack_alloc_size = m + n;
+    if(stack_alloc_size < 128)
       //dgemv_n.S require a 128 bytes buffer
       stack_alloc_size = 128;
-  if(stack_alloc_size > MAX_STACK_ALLOC / sizeof(FLOAT))
+
+    if(stack_alloc_size > MAX_STACK_ALLOC / sizeof(FLOAT))
       stack_alloc_size = 0;
-  FLOAT stack_buffer[stack_alloc_size];
-  buffer = stack_alloc_size ? stack_buffer : (FLOAT *)blas_memory_alloc(1);
+    FLOAT stack_buffer[stack_alloc_size];
+    buffer = stack_alloc_size ? stack_buffer : (FLOAT *)blas_memory_alloc_nolock(1);
+
+  }else{
+    //for gemv_t, only malloc
+    buffer = (FLOAT *)blas_memory_alloc_nolock(1);
+  }
 #else
+  //Original OpenBLAS/GotoBLAS codes.
   buffer = (FLOAT *)blas_memory_alloc(1);
 #endif
 
@@ -251,10 +260,13 @@ void CNAME(enum CBLAS_ORDER order,
 #endif
 
 #ifdef MAX_STACK_ALLOC
-  if(!stack_alloc_size)
-#endif
+  if(!stack_alloc_size){
+    blas_memory_free_nolock(buffer);
+  }
+#else
     blas_memory_free(buffer);
-
+#endif
+  
   FUNCTION_PROFILE_END(1, m * n + m + n,  2 * m * n);
 
   IDEBUG_END;