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Message-ID: <OS0PR01MB5922B797C0FF3ED3C3A8FB7786C8A@OS0PR01MB5922.jpnprd01.prod.outlook.com>
Date:   Sat, 7 Oct 2023 06:24:56 +0000
From:   Biju Das <biju.das.jz@...renesas.com>
To:     Peter Zijlstra <peterz@...radead.org>,
        Mike Galbraith <efault@....de>
CC:     Marek Szyprowski <m.szyprowski@...sung.com>,
        "bsegall@...gle.com" <bsegall@...gle.com>,
        "bristot@...hat.com" <bristot@...hat.com>,
        "chris.hyser@...cle.com" <chris.hyser@...cle.com>,
        "corbet@....net" <corbet@....net>,
        "dietmar.eggemann@....com" <dietmar.eggemann@....com>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "joel@...lfernandes.org" <joel@...lfernandes.org>,
        "joshdon@...gle.com" <joshdon@...gle.com>,
        "juri.lelli@...hat.com" <juri.lelli@...hat.com>,
        "kprateek.nayak@....com" <kprateek.nayak@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "mingo@...nel.org" <mingo@...nel.org>,
        "patrick.bellasi@...bug.net" <patrick.bellasi@...bug.net>,
        Pavel Machek <pavel@....cz>, "pjt@...gle.com" <pjt@...gle.com>,
        "qperret@...gle.com" <qperret@...gle.com>,
        "qyousef@...alina.io" <qyousef@...alina.io>,
        "rostedt@...dmis.org" <rostedt@...dmis.org>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "tim.c.chen@...ux.intel.com" <tim.c.chen@...ux.intel.com>,
        "timj@....org" <timj@....org>,
        "vincent.guittot@...aro.org" <vincent.guittot@...aro.org>,
        "youssefesmat@...omium.org" <youssefesmat@...omium.org>,
        "yu.c.chen@...el.com" <yu.c.chen@...el.com>,
        "mgorman@...e.de" <mgorman@...e.de>,
        "linux-renesas-soc@...r.kernel.org" 
        <linux-renesas-soc@...r.kernel.org>
Subject: RE: [PATCH] sched/fair: fix pick_eevdf to always find the correct se

Hi Peter Zijlstra,


> Subject: Re: [PATCH] sched/fair: fix pick_eevdf to always find the correct
> se
> 
> On Fri, Oct 06, 2023 at 05:55:01PM +0200, Peter Zijlstra wrote:
> 
> > And yeah, min_deadline is hosed somehow.
> >
> > migration/28-185     [028] d..2.    70.264274: validate_cfs_rq: --- /
> > migration/28-185     [028] d..2.    70.264277: __print_se:
> ffff88845cf48080 w: 1024 ve: -58857638 lag: 870381 vd: -55861854 vmd: -
> 66302085 E (11372/tr)
> > migration/28-185     [028] d..2.    70.264280: __print_se:
> ffff88810d165800 w: 25 ve: -80323686 lag: 22336429 vd: -41496434 vmd: -
> 66302085 E (-1//autogroup-31)
> > migration/28-185     [028] d..2.    70.264282: __print_se:
> ffff888108379000 w: 25 ve: 0 lag: -57987257 vd: 114632828 vmd: 114632828 N
> (-1//autogroup-33)
> > migration/28-185     [028] d..2.    70.264283: validate_cfs_rq:
> min_deadline: -55861854 avg_vruntime: -62278313462 / 1074 = -57987256
> >
> > I need to go make dinner (kids hungry), but I'll see if I can figure
> > out how this happens...
> 
> *sigh*, does the below help?

I confirm the message "EEVDF scheduling fail, picking leftmost" is not appearing with this patch.

Cheers,
Biju
> 
> ---
> diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index
> 04fbcbda97d5..6a670f119efa 100644
> --- a/kernel/sched/fair.c
> +++ b/kernel/sched/fair.c
> @@ -3632,6 +3747,7 @@ static void reweight_entity(struct cfs_rq *cfs_rq,
> struct sched_entity *se,
>  		 */
>  		deadline = div_s64(deadline * old_weight, weight);
>  		se->deadline = se->vruntime + deadline;
> +		min_deadline_cb_propagate(&se->run_node, NULL);
>  	}
> 
>  #ifdef CONFIG_SMP

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