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Tidy section: Scheduling Tasks

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Jim Huang 2021-08-07 10:27:05 +08:00
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lkmpg.tex
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@ -1392,12 +1392,14 @@ Adding debug code can change the situation enough to make the bug seem to dissap
Thus you should try to keep debug code to a minimum and make sure it does not show up in production code.
\section{Scheduling Tasks}
\label{sec:orgb1eb02f}
There are two main ways of running tasks: tasklets and work queues. Tasklets are a quick and easy way of scheduling a single function to be run, for example when triggered from an interrupt, whereas work queues are more complicated but also better suited to running multiple things in a sequence.
\label{sec:scheduling_tasks}
There are two main ways of running tasks: tasklets and work queues.
Tasklets are a quick and easy way of scheduling a single function to be run, for example when triggered from an interrupt, whereas work queues are more complicated but also better suited to running multiple things in a sequence.
\subsection{Tasklets}
\label{sec:org5b372fb}
Here's an example tasklet module. The \emph{tasklet\_fn} function runs for a few seconds and in the mean time execution of the \emph{example\_tasklet\_init} function continues to the exit point.
\label{sec:tasklet}
Here is an example tasklet module.
The \verb|tasklet_fn| function runs for a few seconds and in the mean time execution of the \verb|example_tasklet_init| function continues to the exit point.
\samplec{examples/example_tasklet.c}
@ -1411,8 +1413,9 @@ Example tasklet ends
\end{verbatim}
\subsection{Work queues}
\label{sec:orgb4f6fbb}
To add a task to the scheduler we can use a workqueue. The kernel then uses the Completely Fair Scheduler (CFS) to execute work within the queue.
\label{sec:workqueue}
To add a task to the scheduler we can use a workqueue.
The kernel then uses the Completely Fair Scheduler (CFS) to execute work within the queue.
\samplec{examples/sched.c}