linux-kernel - Re: [PATCH 2/2] rt: Increase/decrease the nr of migratory tasks when enabling/disabling migration

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Date:   Mon, 26 Jun 2017 14:16:10 +0200
From:   Daniel Bristot de Oliveira <bristot@...hat.com>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     linux-rt-users <linux-rt-users@...r.kernel.org>,
        "Luis Claudio R . Goncalves" <lgoncalv@...hat.com>,
        Clark Williams <williams@...hat.com>,
        Luiz Capitulino <lcapitulino@...hat.com>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Thomas Gleixner <tglx@...utronix.de>,
        Steven Rostedt <rostedt@...dmis.org>,
        Peter Zijlstra <peterz@...radead.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] rt: Increase/decrease the nr of migratory tasks when
 enabling/disabling migration

On 06/24/2017 08:41 AM, Ingo Molnar wrote:
>> +enum inc_dec_migratory {
>> +	DEC_NR_MIGRATORY = -1,
>> +	INC_NR_MIGRATORY = 1,
>> +};
>> +
>> +static inline void
>> +inc_dec_nr_migratory(struct task_struct *p, enum inc_dec_migratory id)
>> +{
>> +	if (unlikely((p->sched_class == &rt_sched_class ||
>> +		      p->sched_class == &dl_sched_class) &&
>> +		      p->nr_cpus_allowed > 1)) {
>> +		if (p->sched_class == &rt_sched_class)
>> +			task_rq(p)->rt.rt_nr_migratory += id;
>> +		else
>> +			task_rq(p)->dl.dl_nr_migratory += id;
>> +	}
>> +}
> How about just 'long delta', pass in +1 or -1 and do away with the 
> inc_dec_migratory complication?

Ack! I am cooking a v2 using a long delta, rather than the
inc_dec_migratory complication (yeah, I exaggerated hehe).

Thanks!

-- Daniel