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Date:   Sun, 12 Feb 2017 20:57:42 +0100
From:   Pavel Machek <pavel@....cz>
To:     Woody Suwalski <terraluna977@...il.com>
Cc:     "Rafael J. Wysocki" <rjw@...ysocki.net>,
        kernel list <linux-kernel@...r.kernel.org>, tglx@...utronix.de,
        mingo@...hat.com, hpa@...or.com
Subject: Re: 4.10-rc1: thinkpad x60: who ate my cpu?

Hi!

> >The kernel is 4.8.17 EOL, installed almost a month ago.
> >Platform ThinkPad x60,  Intel(R) Core(TM) Duo CPU      T2400  @ 1.83GHz
> >
> >In dmesg I see that it used to be when 2 CPUs were OK:
> >[690409.476107] PM: noirq suspend of devices complete after 79.914 msecs
> >[690409.476547] ACPI: Preparing to enter system sleep state S3
> >[690409.780081] ACPI : EC: EC stopped
> >[690409.780083] PM: Saving platform NVS memory
> >[690409.780284] Disabling non-boot CPUs ...
> >[690409.805284] smpboot: CPU 1 is now offline
> >[690409.816464] ACPI: Low-level resume complete
> >[690409.816464] ACPI : EC: EC started
> >[690409.816464] PM: Restoring platform NVS memory
> >[690409.816464] Enabling non-boot CPUs ...
> >[690409.840574] x86: Booting SMP configuration:
> >[690409.840576] smpboot: Booting Node 0 Processor 1 APIC 0x1
> >[690409.805271] Initializing CPU#1
> >[690409.805271] Disabled fast string operations
> >[690409.888252]  cache: parent cpu1 should not be sleeping
> >[690409.920185] CPU1 is up
> >[690409.922288] ACPI: Waking up from system sleep state S3
> >
> >Then the CPU1 failed to start:
> >
> >[691329.776108] PM: noirq suspend of devices complete after 79.941 msecs
> >[691329.776550] ACPI: Preparing to enter system sleep state S3
> >[691330.080081] ACPI : EC: EC stopped
> >[691330.080083] PM: Saving platform NVS memory
> >[691330.080284] Disabling non-boot CPUs ...
> >[691330.105303] smpboot: CPU 1 is now offline
> >[691330.116477] ACPI: Low-level resume complete
> >[691330.116477] ACPI : EC: EC started
> >[691330.116477] PM: Restoring platform NVS memory
> >[691330.116477] Enabling non-boot CPUs ...
> >[691330.140570] x86: Booting SMP configuration:
> >[691330.140572] smpboot: Booting Node 0 Processor 1 APIC 0x1
> >[691340.140015] smpboot: do_boot_cpu failed(-1) to wakeup CPU#1
> >[691340.164445] Error taking CPU1 up: -5
> >[691340.166309] ACPI: Waking up from system sleep state S3
> >
> >And now it is:
> >[692517.868523] ACPI: Preparing to enter system sleep state S3
> >[692518.172074] ACPI : EC: EC stopped
> >[692518.172076] PM: Saving platform NVS memory
> >[692518.172269] Disabling non-boot CPUs ...
> >[692518.172269] ACPI: Low-level resume complete
> >[692518.172269] ACPI : EC: EC started
> >[692518.172269] PM: Restoring platform NVS memory
> >[692518.172269] ACPI: Waking up from system sleep state S3
> >
> >Is there any test I could do on the CPU wakeup while in that state?
> >
> Is there a way to kick the offline-CPU into operation from /sys level?

echo 0 > /sys/devices/system/cpu/cpu1/online

should work. And... good thinking :-).

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

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