From mboxrd@z Thu Jan  1 00:00:00 1970
Subject: Re: [Xenomai-core] [RFC, PATCH] per-thread exec-time stats
From: Philippe Gerum <rpm@xenomai.org>
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Date: Fri, 07 Jul 2006 09:54:25 +0200
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To: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
Cc: Jan Kiszka <jan.kiszka@domain.hid>, xenomai-core <xenomai@xenomai.org>

On Fri, 2006-07-07 at 01:47 +0200, Gilles Chanteperdrix wrote:
> Philippe Gerum wrote:
>  > > +#ifdef CONFIG_XENO_OPT_STATS
>  > > +static inline void xnpod_acc_exec_time(xnsched_t *sched,
>  > > +                                       xnthread_t *threadout)
>  > > +{
>  > > +    xnticks_t now = xntimer_get_rawclock();
>  > > +    threadout->stat.exec_time += now - sched->last_csw;
>  > > +    sched->last_csw = now;
>  > > +}
>  > 
>  > It would be better to only pass the thread pointer, then use the
>  > thread->sched member. This would clearly explain the relationship
>  > between both, and prevent any bugous attempt at mixing things.
> 
> Beware, when xnpod_schedule is called from within
> xnpod_migrate_thread(), the sched pointer of the switched out thread is
> the one of the destination cpu. So, passing the sched and threadout
> pointers to xnpod_acc_exec_time is safer.

Nope, the nklock is held by the migrating thread all along until the
switch has actually occured.

> 
> 
-- 
Philippe.