The article deals with Inactive memory and discusses whether high allocation represents an issue.The content of /proc/meminfo shows high amount of Inactive memory. Here is an example:
Definition of Inactive memory:
The total amount of buffer or page cache memory that are free and available. This is memory that has not been recently utilized by any application for some time and can be reclaimed for other purposes by the paging algorithm.
Typically, a large amount of Inactive memory isn't an issue. If required, there are two ways to clear the memory:
1. Reboot the module
2. Run the following command sequence that clears the page/dentries/inodes caches:
# echo 3 > /proc/sys/vm/drop_caches
This is a non-destructive operation and will only free objects that are completely unused. If you still have high levels of usage after running this command, there are still objects actually being used by a process and as such can not be cleared without killing the process or restarting the system.