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TAD (Test And Diagnostic) monitors the amount of free memory available in the system at run time. It triggers the memory/Resource Reclamation (RR) process in TDM, when the amount of free memory drops below a configurable threshold. RR process can also be triggered by memory allocation failures which results in a notification being sent to TDM to try to reclaim memory.
Selfheal is another feature implemented in Test And Diagnostic Component.
Self-heal monitors:
Self-heal stores Reset Count and Reboot Count.
Self-heal takes required action like: Rebooting the device, Restarting required process based on predefined conditions.
Self-heal does connectivity test.
Monitors the resources periodically (eg: 15 mins). If "Average Memory Used" reaches threshold value, necessary action will be executed.
"resource_monitor.sh" script is used for monitoring Memory and CPU usage.
Located in the device path: "/fss/gw/usr/ccsp/tad/resource_monitor.sh".
Monitors the processes periodically (eg: 15 mins) based on process id (pid). Based on the process id availability, required action will be taken such as restarting the process, rebooting the device.
"task_health_monitor.sh" script is used for monitoring RDK-B processes. This is located at path: "/fss/gw/usr/ccsp/tad/task_health_monitor.sh"
Self-heal stores Reset Count and Reboot Count
Self-heal does connectivity test. Ping test will be done through server IP/URI (this needs to be configured). If server IP/URI is not configured, Ping test won't be executed and no action will be taken. If server is configured and ping test fails, reboot action will be executed.
"self_heal_connectivity_test.sh" script is used for ping test
Self-heal takes the required action through "corrective_action.sh" script. This script has implementation of the actions.
Some of the actions are:
rebootNeeded - Reboots the device
resetNeeded - Restarts the required process
storeInformation - Stores Memory and CPU usage
In Raspberry Pi the functionality of self-heal feature is provided by systemd.