linux-kernel - Re: PM / Suspend: Print wall time at suspend entry and exit

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Date:   Mon, 5 Jun 2017 23:18:35 +0200
From:   Pavel Machek <pavel@....cz>
To:     "Rafael J. Wysocki" <rafael@...nel.org>
Cc:     Mark Salyzyn <salyzyn@...roid.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux PM <linux-pm@...r.kernel.org>,
        Todd Poynor <toddpoynor@...gle.com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Len Brown <len.brown@...el.com>
Subject: Re: PM / Suspend: Print wall time at suspend entry and exit

Hi!

> On Mon, Jun 5, 2017 at 9:31 PM, Mark Salyzyn <salyzyn@...roid.com> wrote:
> > Permits power state and battery life diagnosis.
> 
> Which is possible even without this patch and we have tools for that
> (analyze_suspend.py, anyone?).
> 
> Honestly, I don't see why this change is necessary or even useful.

I ran dmesg after resume and now I...

[1019729.486249] ACPI : EC: EC stopped
[1019729.486255] PM: Saving platform NVS memory
[1019729.486276] Disabling non-boot CPUs ...
[1019729.490423] smpboot: CPU 1 is now offline
[1019729.531015] smpboot: CPU 2 is now offline
[1019729.577742] Broke affinity for irq 16
[1019729.577747] Broke affinity for irq 17
[1019729.577751] Broke affinity for irq 19
[1019729.577756] Broke affinity for irq 23
[1019729.578771] smpboot: CPU 3 is now offline
[1019729.604987] ACPI: Low-level resume complete
[1019729.605052] ACPI : EC: EC started
[1019729.605054] PM: Restoring platform NVS memory
[1019729.605352] Suspended for 3196.166 seconds
[1019729.605376] Enabling non-boot CPUs ...
[1019729.631246] x86: Booting SMP configuration:
[1019729.631249] smpboot: Booting Node 0 Processor 1 APIC 0x1
[1019729.631496] Initializing CPU#1
[1019729.631514] Disabled fast string operations
[1019729.636643]  cache: parent cpu1 should not be sleeping
[1019729.637286] CPU1 is up

Aha. I missed the "suspended for 3196" message before. So I believe
you are right; there's already enough information in the kernel logs.

									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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