docs: added example how to make tmpfs changes permanent

docs/admin/tuning-mount-cache-memory.rst

@@ -1,42 +1,51 b''
 .. _data-mem:
 
 Mount Cache Folders To Memory
 -----------------------------
 
 To increase the performance of folders containing cache data, you can mount
 them to memory. The following folders specified in the :file:`rhodecode.ini`
 file would benefit from this.
 
 .. code-block:: ini
 
     cache_dir = %(here)s/data
     search.location = %(here)s/data/index
 
 Use the following Ubuntu example to mount these to memory, or see your
 particular |os| instructions. The expected performance benefit is
 approximately 5%. You should ensure you allocate an adequate amount of memory
 depending on your available resources.
 
 .. code-block:: bash
 
     # mount to memory with 2GB limit and 755 write permissions
     mount -t tmpfs -o size=2G,mode=0755 tmpfs /home/user/.rccontrol/enterprise-1/data
     mount -t tmpfs -o size=2G,mode=0755 tmpfs /home/user/.rccontrol/enterprise-1/data/index
 
 .. _move-tmp:
 
+
+In order to make this change permanent it's recommend to set it as /etc/fstab
+entry.
+
+.. code-block:: bash
+
+    tmpfs   /home/user/.rccontrol/enterprise-1/data tmpfs   nodev,nosuid,noexec,nodiratime,size=2G   0 0
+
+
 Move ``tmp`` to TMPFS
 ---------------------
 
 |RCE| components heavily use the :file:`/tmp` folder, so moving your
 :file:`/tmp` folder into to a RAM-based TMPS can lead to a noticeable
 performance boost.
 
 .. code-block:: bash
 
     # mount tmp to memory with 2GB limit and 1777 write permissions
     mount -t tmpfs -o size=2G,mode=1777 tmpfs /tmp
 
 For more information about TMPFS, see the documentation `here`_.
 
 .. _here: https://wiki.archlinux.org/index.php/Tmpfs