* john mathew [off-list ref] [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
Srikar Dronamraju