Re: [RFC PATCH v3 3/6] sched, tracing: add to report task state in symbolic chars

[Ze Gao <zegao2021@xxxxxxxxx>]

Sorry that I don't get this one, did you mean kernel subsystems like
bpf or third party modules?  Honestly I don't know how it works here
for userspace to consume the raw tracepoint without looking at
tracefs.

Regards,
Ze

On Tue, Aug 1, 2023 at 7:46 PM Peter Zijlstra <peterz@xxxxxxxxxxxxx> wrote:
>
> On Tue, Aug 01, 2023 at 05:01:21PM +0800, Ze Gao wrote:
> > @@ -233,6 +255,7 @@ TRACE_EVENT(sched_switch,
> >               __field(        pid_t,  prev_pid                        )
> >               __field(        int,    prev_prio                       )
> >               __field(        long,   prev_state                      )
> > +             __field(        char,   prev_state_char                 )
> >               __array(        char,   next_comm,      TASK_COMM_LEN   )
> >               __field(        pid_t,  next_pid                        )
> >               __field(        int,    next_prio                       )
>
> And this again will wreck everybody that consumes the raw tracepoint
> without looking at tracefs.