From: Daniel Bristot de Oliveira <bristot@redhat.com>
To: Henri Roosen <henri.roosen@ginzinger.com>,
Daniel Bristot de Oliveira <bristot@redhat.com>,
linux-rt-users <linux-rt-users@vger.kernel.org>
Cc: "Luis Claudio R . Goncalves" <lgoncalv@redhat.com>,
Clark Williams <williams@redhat.com>,
Luiz Capitulino <lcapitulino@redhat.com>,
Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
Thomas Gleixner <tglx@linutronix.de>,
Steven Rostedt <rostedt@goodmis.org>,
Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@kernel.org>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH V2 2/2] rt: Increase/decrease the nr of migratory tasks when enabling/disabling migration
Date: Tue, 27 Jun 2017 18:32:51 +0200 [thread overview]
Message-ID: <998180d6-b4c5-bf04-1088-4d5055e4eaf1@redhat.com> (raw)
In-Reply-To: <94154431-a0b2-b106-8c23-519ce866271f@ginzinger.com>
On 06/27/2017 04:55 PM, Henri Roosen wrote:
>>
>> As rt_nr_migratory is unsigned, it will become > 0, notifying that the
>> RQ is overloaded, activating pushing mechanism without need.
>
> What kind of symptoms might be triggered by this? I'm currently facing a
> problem with a continuous-reboot-test where the kernel seems to hang
> sometimes at a (seemingly) random place during kernel boot, on
> 4.9.33-rt23 with iMX6Q. A back-port of this patch to 4.9-rt seems to fix
> it. Or is it covering up a different problem?
The side effect is notifying that the RQ is overloaded, activating
pushing mechanism without need.
I was not seeing system freezes because of it... but, just in case...do
you have the console output from your board?
-- Daniel
next prev parent reply other threads:[~2017-06-27 16:33 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-06-26 15:07 [PATCH V2 0/2] " Daniel Bristot de Oliveira
2017-06-26 15:07 ` [PATCH V2 1/2] sched/debug: Inform the number of rt/dl task that can migrate Daniel Bristot de Oliveira
2017-06-30 13:09 ` [tip:sched/core] sched/debug: Expose the number of RT/DL tasks " tip-bot for Daniel Bristot de Oliveira
2017-06-26 15:07 ` [PATCH V2 2/2] rt: Increase/decrease the nr of migratory tasks when enabling/disabling migration Daniel Bristot de Oliveira
2017-06-27 14:55 ` Henri Roosen
2017-06-27 16:32 ` Daniel Bristot de Oliveira [this message]
2017-06-30 7:30 ` Ingo Molnar
2017-06-30 8:51 ` Daniel Bristot de Oliveira
2017-06-30 9:41 ` Ingo Molnar
2017-08-07 15:46 ` Sebastian Andrzej Siewior
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