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

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Message-ID: <20251205133552.GA400972@pauld.westford.csb>
Date: Fri, 5 Dec 2025 08:35:52 -0500
From: Phil Auld <pauld@...hat.com>
To: Gabriele Monaco <gmonaco@...hat.com>
Cc: linux-kernel@...r.kernel.org, Steven Rostedt <rostedt@...dmis.org>,
	Nam Cao <namcao@...utronix.de>, Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Tomas Glozar <tglozar@...hat.com>, Juri Lelli <jlelli@...hat.com>,
	Clark Williams <williams@...hat.com>,
	John Kacur <jkacur@...hat.com>, linux-trace-kernel@...r.kernel.org
Subject: Re: [PATCH v3 08/13] sched: Export hidden tracepoints to modules

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@...hat.com>

This makes sense.

Reviewed-by: Phil Auld <pauld@...hat.com>


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
> 
> 

--