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    SubjectRe: [RFC][PATCH 17/22] sched: add signaling overrunning -deadline tasks.
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    On Thu, 2010-11-11 at 22:58 +0100, Peter Zijlstra wrote:
    > On Fri, 2010-10-29 at 08:40 +0200, Raistlin wrote:
    > > +static inline void __dl_signal(struct task_struct *tsk, int which)
    > > +{
    > > + struct siginfo info;
    > > + long long amount = which == SF_SIG_DMISS ? tsk->dl.stats.last_dmiss :
    > > + tsk->dl.stats.last_rorun;
    > > +
    > > + info.si_signo = SIGXCPU;
    > > + info.si_errno = which;
    > > + info.si_code = SI_KERNEL;
    > > + info.si_pid = 0;
    > > + info.si_uid = 0;
    > > + info.si_value.sival_int = (int)amount;
    > > +
    > > + /* Correctly take the locks on task's sighand */
    > > + __group_send_sig_info(SIGXCPU, &info, tsk);
    > > + /* Log what happened to dmesg */
    > > + printk(KERN_INFO "SCHED_DEADLINE: 0x%4x by %Ld [ns] in %d (%s)\n",
    > > + which, amount, task_pid_nr(tsk), tsk->comm);
    > > +}
    >
    > This being a G-EDF like scheduler with a u<=1 schedulability test, we're
    > firmly in soft-rt territory which means the above will be very easy to
    > trigger.. Maybe not spam dmesg?
    >
    Ok, right. Maybe, if I add the SF_HARD_RT flag (and force the hard tasks
    to run on a single CPU they must specify) I can keep the notification
    for those tasks only. What do you think?

    Thanks,
    Dario

    --
    <<This happens because I choose it to happen!>> (Raistlin Majere)
    ----------------------------------------------------------------------
    Dario Faggioli, ReTiS Lab, Scuola Superiore Sant'Anna, Pisa (Italy)

    http://blog.linux.it/raistlin / raistlin@ekiga.net /
    dario.faggioli@jabber.org
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