Re: [PATCH v3 08/13] sched: Export hidden tracepoints to modules

Phil Auld
2025-12-11T22:37:08Z

Hi Peter,

On Fri, Dec 05, 2025 at 08:35:52AM -0500 Phil Auld wrote:
> On Fri, Dec 05, 2025 at 02:16:16PM +0100 Gabriele Monaco wrote:
> > The tracepoints sched_entry, sched_exit and sched_set_need_resched
> > are not exported to tracefs as trace events, this allows only kernel
> > code to access them. Helper modules like [1] can be used to still have
> > the tracepoints available to ftrace for debugging purposes, but they do
> > rely on the tracepoints being exported.
> >
> > Export the 3 not exported tracepoints.
> > Note that sched_set_state is already exported as the macro is called
> > from modules.
> >
> > [1] - https://github.com/qais-yousef/sched_tp.git
> >
> > Signed-off-by: Gabriele Monaco <gmonaco@redhat.com>
>
> This makes sense.
>
> Reviewed-by: Phil Auld <pauld@redhat.com>
>

Any chance we can get this one in even if the rest of the series
needs more time?

Without this, out of tree modules fail to link.

I don't know if it's worth adding:

Fixes: adcc3bfa8806 ("sched: Adapt sched tracepoints for RV task model")

Cheers,
Phil

>
> Cheers,
> Phil
>
> > ---
> > kernel/sched/core.c | 3 +++
> > 1 file changed, 3 insertions(+)
> >
> > diff --git a/kernel/sched/core.c b/kernel/sched/core.c
> > index 41ba0be16911..5516778c19eb 100644
> > --- a/kernel/sched/core.c
> > +++ b/kernel/sched/core.c
> > @@ -119,6 +119,9 @@ EXPORT_TRACEPOINT_SYMBOL_GPL(sched_util_est_cfs_tp);
> > EXPORT_TRACEPOINT_SYMBOL_GPL(sched_util_est_se_tp);
> > EXPORT_TRACEPOINT_SYMBOL_GPL(sched_update_nr_running_tp);
> > EXPORT_TRACEPOINT_SYMBOL_GPL(sched_compute_energy_tp);
> > +EXPORT_TRACEPOINT_SYMBOL_GPL(sched_entry_tp);
> > +EXPORT_TRACEPOINT_SYMBOL_GPL(sched_exit_tp);
> > +EXPORT_TRACEPOINT_SYMBOL_GPL(sched_set_need_resched_tp);
> >
> > DEFINE_PER_CPU_SHARED_ALIGNED(struct rq, runqueues);
> > DEFINE_PER_CPU(struct rnd_state, sched_rnd_state);
> > --
> > 2.52.0
> >
> >
>
> --
>

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