Find the specific processes that are spending an inordinate amount of their CPU time servicing system calls. If these are system processes, look to see if there are any available kernel patches.
Check for run-away processes, or any configuration changes that can have caused System CPU usage to spike.
Check /var/log/messages for signs of hardware failures. Finally, look for other signs of sudden increase in the workload, such as excessive paging. If this is due to an increase in workload, consider
increasing available system resources by upgrading the system.
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