linux-kernel - Re: S3 resume regression [1cf4f629d9d2 ("cpu/hotplug: Move online calls to hotplugged cpu")]

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Date:   Tue, 8 Nov 2016 22:08:37 -0800
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Feng Tang <feng.tang@...el.com>
Cc:     Ville Syrjälä <ville.syrjala@...ux.intel.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Feng Tang <feng.79.tang@...il.com>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        "Wysocki, Rafael J" <rafael.j.wysocki@...el.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        "linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
        Rik van Riel <riel@...hat.com>,
        "Srivatsa S. Bhat" <srivatsa@....edu>,
        Peter Zijlstra <peterz@...radead.org>,
        Arjan van de Ven <arjan@...ux.intel.com>,
        Rusty Russell <rusty@...tcorp.com.au>,
        Oleg Nesterov <oleg@...hat.com>, Tejun Heo <tj@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Paul McKenney <paulmck@...ux.vnet.ibm.com>,
        Paul Turner <pjt@...gle.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "Zhang, Rui" <rui.zhang@...el.com>,
        "Brown, Len" <len.brown@...el.com>,
        Linux PM <linux-pm@...r.kernel.org>,
        Linux ACPI <linux-acpi@...r.kernel.org>
Subject: Re: S3 resume regression [1cf4f629d9d2 ("cpu/hotplug: Move online
 calls to hotplugged cpu")]

On Tue, Nov 8, 2016 at 7:54 PM, Feng Tang <feng.tang@...el.com> wrote:
> On Wed, Nov 02, 2016 at 04:47:37AM +0800, Ville Syrjälä wrote:
>>
>> I left the thing running for the weekend and it failed 26 out of 16057
>> times with the 25ms timeout. Looks like it takes ~5 minutes to resume
>> when it fails, but eventually it does come back.
>
> Just came back from a travel. Yes, the 5 minutes delay may be due to the
> expiration of the HPET timer, counting from 0 to 0xffffffff for a 13M
> frequencey HPET takes about 300 seconds. After resume, it seems nobody
> arms it so my old patch forces to arm one event.

Ville, what happens if you disable HPET? Can you force the TSC with
"clocksource=tsc" or "tsc=reliable". Does resume work reliably then?

Or is this one of the CPU's where tsc just doesn't work?

              Linus