System Idle Process

System Idle Process
In Windows NT operating systems, the System Idle Process contains one or more kernel threads which run when no other runnable thread can be scheduled on a CPU In a multiprocessor system, there is one idle thread associated with each CPU core For a system with hyperthreading enabled, there is an idle thread for each logical processor
The primary purpose of the idle process and its threads is to eliminate what would otherwise be a special case in the scheduler Without the idle threads, there could be cases when no threads were runnable or "Ready" in terms of Windows scheduling states Since the idle threads are always in a Ready state if not already Running, this can never happen Thus whenever the scheduler is called due to the current thread leaving its CPU, another thread can always be found to run on that CPU, even if it is only the CPUs idle thread The CPU time attributed to the idle process is therefore indicative of the amount of CPU time that is not needed or wanted by any other threads in the system
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