diff --git a/fs/inode/fs_files.c b/fs/inode/fs_files.c
index e61f432c52..40cb5f9911 100644
--- a/fs/inode/fs_files.c
+++ b/fs/inode/fs_files.c
@@ -154,7 +154,7 @@ static int files_extend(FAR struct filelist *list, size_t row)
 
   spin_unlock_irqrestore(&list->fl_lock, flags);
 
-  if (tmp != NULL)
+  if (tmp != NULL && tmp != &list->fl_prefile)
     {
       kmm_free(tmp);
     }
@@ -298,7 +298,13 @@ static int nx_dup3_from_tcb(FAR struct tcb_s *tcb, int fd1, int fd2,
 
 void files_initlist(FAR struct filelist *list)
 {
-  DEBUGASSERT(list);
+  /* The first row will reuse pre-allocated files, which will avoid
+   * unnecessary allocator accesses during file initialization.
+   */
+
+  list->fl_rows = 1;
+  list->fl_files = &list->fl_prefile;
+  list->fl_prefile = list->fl_prefiles;
 }
 
 /****************************************************************************
@@ -328,10 +334,16 @@ void files_releaselist(FAR struct filelist *list)
           file_close(&list->fl_files[i][j]);
         }
 
-      kmm_free(list->fl_files[i]);
+      if (i != 0)
+        {
+          kmm_free(list->fl_files[i]);
+        }
     }
 
-  kmm_free(list->fl_files);
+  if (list->fl_files != &list->fl_prefile)
+    {
+      kmm_free(list->fl_files);
+    }
 }
 
 /****************************************************************************
diff --git a/include/nuttx/fs/fs.h b/include/nuttx/fs/fs.h
index d4f598cdab..3816e1501c 100644
--- a/include/nuttx/fs/fs.h
+++ b/include/nuttx/fs/fs.h
@@ -488,6 +488,15 @@ struct filelist
   spinlock_t        fl_lock;    /* Manage access to the file list */
   uint8_t           fl_rows;    /* The number of rows of fl_files array */
   FAR struct file **fl_files;   /* The pointer of two layer file descriptors array */
+
+  /* Pre-allocated files to avoid allocator access during thread creation
+   * phase, For functional safety requirements, increase
+   * CONFIG_NFILE_DESCRIPTORS_PER_BLOCK could also avoid allocator access
+   * caused by the file descriptor exceeding the limit.
+   */
+
+  FAR struct file  *fl_prefile;
+  FAR struct file   fl_prefiles[CONFIG_NFILE_DESCRIPTORS_PER_BLOCK];
 };
 
 /* The following structure defines the list of files used for standard C I/O.