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Date: Thu, 11 Nov 2010 22:58:21 +0100
From: Peter Zijlstra <peterz@...radead.org>
To: Raistlin <raistlin@...ux.it>
Cc: Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
Steven Rostedt <rostedt@...dmis.org>,
Chris Friesen <cfriesen@...tel.com>, oleg@...hat.com,
Frederic Weisbecker <fweisbec@...il.com>,
Darren Hart <darren@...art.com>,
Johan Eker <johan.eker@...csson.com>,
"p.faure" <p.faure@...tech.ch>,
linux-kernel <linux-kernel@...r.kernel.org>,
Claudio Scordino <claudio@...dence.eu.com>,
michael trimarchi <trimarchi@...is.sssup.it>,
Fabio Checconi <fabio@...dalf.sssup.it>,
Tommaso Cucinotta <cucinotta@...up.it>,
Juri Lelli <juri.lelli@...il.com>,
Nicola Manica <nicola.manica@...i.unitn.it>,
Luca Abeni <luca.abeni@...tn.it>,
Dhaval Giani <dhaval@...is.sssup.it>,
Harald Gustafsson <hgu1972@...il.com>,
paulmck <paulmck@...ux.vnet.ibm.com>
Subject: Re: [RFC][PATCH 17/22] sched: add signaling overrunning -deadline
tasks.
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?
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