linux-kernel - Re: [patch 61/66] timers: Convert to hotplug state machine

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Message-ID: <6f2fe6d4-38bf-4feb-1d5e-e2705c333670@nvidia.com>
Date:	Tue, 26 Jul 2016 10:23:02 +0100
From:	Jon Hunter <jonathanh@...dia.com>
To:	<rcochran@...utronix.de>
CC:	Anna-Maria Gleixner <anna-maria@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	"Ingo Molnar" <mingo@...nel.org>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>
Subject: Re: [patch 61/66] timers: Convert to hotplug state machine


On 25/07/16 21:46, rcochran@...utronix.de wrote:
> On Mon, Jul 25, 2016 at 05:35:43PM +0200, rcochran@...utronix.de wrote:
>> I see if I can find a tegra system to test with...
> 
> I tried the tip:smp/hotplug branch under kvm x86_64, and I didn't see
> any problems with suspend or hibernate, even with CONFIG_PREEMPT_NONE.
> I'll see if I can get my hands on a tegra system tomorrow.  Until
> then, two questions:
> 
> 1. The issue appears with suspend (echo mem > /sys/power/state), as
>    opposed to hibernate, right?

Yes. I have been using rtcwake to test suspend with the following
arguments ...

# rtcwake -d rtc1 -m mem -s 3

> 2. CONFIG_PREEMPT_NONE is good, but CONFIG_PREEMPT is bad, right?

The other way around.

Cheers
Jon

-- 
nvpublic