Re: [RFC][PATCH v2 5/5] sched: User Mode Concurency Groups

Peter Zijlstra
2022-01-27T12:26:52Z

On Mon, Jan 24, 2022 at 10:46:17PM +0800, Tao Zhou wrote:
> > +/**
> > + * sys_umcg_wait: transfer running context
> > + *
> > + * Called like:
> > + *
> > + * self->state = UMCG_TASK_RUNNABLE | UMCG_TF_COND_WAIT;
> > + * ...
> > + * sys_umcg_wait(0, time);
> > + *
> > + * The syscall will clear TF_COND_WAIT and wait until state becomes RUNNING.
> > + * The code '...' must not contain syscalls
> > + *
> > + * If self->next_tid is set and indicates a valid UMCG task with RUNNABLE state
> > + * that task will be made RUNNING and woken -- transfering the running context
> > + * to that task. In this case self->next_tid is modified with TID_RUNNING to
> > + * indicate self->next_tid is consumed.
> > + *
> > + * If self->next has TID_RUNNING set, it is validated the related task has
>
> /self->next/self->next_tid/

Yeah, there's more of that, I'll be sure to go re-read all the comments.