Re: [RFC PATCH v5 3/3] docs: scheduler: Add introduction to scheduler context-switch
From: Srikar Dronamraju
Date: Tue May 26 2020 - 06:27:03 EST
* john mathew <john.mathew@xxxxxxxxxx> [2020-05-14 12:26:37]:
> +Context Switching
> +Context switching, the switching from a running task to another,
> +is done by the context_switch() function defined in kernel/sched.c.
context_switch is defined in kernel/sched/core.c
> +It is called by __schedule() when a new process has been selected to run.
> +The execution flow is as follows:
> + For a kernel task switching to a user task, switch_mm_irqs_off()
> + replaces the address space of prev kernel task with the next from the user
> + task. Same as for exiting process in this case, the context_switch()
Did you mean existing instead of exiting?
> + function saves the pointer to the memory descriptor used by prev in the
> + runqueue???s prev_mm field and resets prev task active address space.
Thanks and Regards