You can check the memory utilization from the tmsh and verify the tmm memory usage. If it is more than 70% you might need to worry about really. As per the graph, you have enough tmm free memory i think.
Sys::System Memory Information
------------------------------------------------------------------
Memory Used(bytes) Current Average Max(since 01/13/17 08:33:34)
------------------------------------------------------------------
Total Phys Memory 11.1G 11.1G 11.1G
OS Used Memory 11.0G 11.0G 11.1G
TMM Alloc Memory 5.1G 5.1G 5.1G
TMM Used Memory 580.7M 569.5M 584.2M
OS Used Swap 0 0 0
You can read about the memory allocation here
-Jinshu