linux-kernel - Re: [PATCH] Export sched tracepoints for use by kernel modules

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Date:	Tue, 22 Apr 2014 07:53:58 -0700
From:	Drew Richardson <drew.richardson@....com>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Pawel Moll <Pawel.Moll@....com>
Subject: Re: [PATCH] Export sched tracepoints for use by kernel modules

On Tue, Apr 22, 2014 at 03:45:04PM +0100, Ingo Molnar wrote:
> 
> * Drew Richardson <drew.richardson@....com> wrote:
> 
> > After commit de7b2973903c6cc50b31ee5682a69b2219b9919d ("tracepoint:
> > Use struct pointer instead of name hash for reg/unreg tracepoints"),
> > any tracepoints used in a kernel module must be exported.
> > 
> > Signed-off-by: Drew Richardson <drew.richardson@....com>
> > Acked-by: Pawel Moll <pawel.moll@....com>
> > ---
> >  kernel/sched/core.c | 25 +++++++++++++++++++++++++
> >  1 file changed, 25 insertions(+)
> > 
> > diff --git a/kernel/sched/core.c b/kernel/sched/core.c
> > index 268a45ea238c..cdb8e92ff24a 100644
> > --- a/kernel/sched/core.c
> > +++ b/kernel/sched/core.c
> > @@ -90,6 +90,31 @@
> >  #define CREATE_TRACE_POINTS
> >  #include <trace/events/sched.h>
> >  
> > +EXPORT_TRACEPOINT_SYMBOL_GPL(sched_kthread_stop);
> > +EXPORT_TRACEPOINT_SYMBOL_GPL(sched_kthread_stop_ret);
> > +EXPORT_TRACEPOINT_SYMBOL_GPL(sched_wakeup);
> > +EXPORT_TRACEPOINT_SYMBOL_GPL(sched_wakeup_new);
> > +EXPORT_TRACEPOINT_SYMBOL_GPL(sched_switch);
> > +EXPORT_TRACEPOINT_SYMBOL_GPL(sched_migrate_task);
> > +EXPORT_TRACEPOINT_SYMBOL_GPL(sched_process_free);
> > +EXPORT_TRACEPOINT_SYMBOL_GPL(sched_process_exit);
> > +EXPORT_TRACEPOINT_SYMBOL_GPL(sched_wait_task);
> > +EXPORT_TRACEPOINT_SYMBOL_GPL(sched_process_wait);
> > +EXPORT_TRACEPOINT_SYMBOL_GPL(sched_process_fork);
> > +EXPORT_TRACEPOINT_SYMBOL_GPL(sched_process_exec);
> > +EXPORT_TRACEPOINT_SYMBOL_GPL(sched_stat_wait);
> > +EXPORT_TRACEPOINT_SYMBOL_GPL(sched_stat_sleep);
> > +EXPORT_TRACEPOINT_SYMBOL_GPL(sched_stat_iowait);
> > +EXPORT_TRACEPOINT_SYMBOL_GPL(sched_stat_blocked);
> > +EXPORT_TRACEPOINT_SYMBOL_GPL(sched_stat_runtime);
> > +EXPORT_TRACEPOINT_SYMBOL_GPL(sched_pi_setprio);
> > +#ifdef CONFIG_DETECT_HUNG_TASK
> > +EXPORT_TRACEPOINT_SYMBOL_GPL(sched_process_hang);
> > +#endif /* CONFIG_DETECT_HUNG_TASK */
> > +EXPORT_TRACEPOINT_SYMBOL_GPL(sched_move_numa);
> > +EXPORT_TRACEPOINT_SYMBOL_GPL(sched_stick_numa);
> > +EXPORT_TRACEPOINT_SYMBOL_GPL(sched_swap_numa);
> 
> Which in-tree kernel module is using these?
> 
> Thanks,
> 
> 	Ingo
> 

Gator (http://git.linaro.org/arm/ds5/gator.git), an out of tree kernel
module, uses sched_process_fork, sched_switch and
sched_process_free. Along with exporting those tracepoints I thought
it would be helpful to export all the tracepoints from
trace/events/sched.h.

Thanks,

Drew
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