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Date: Tue, 22 Nov 2016 10:05:50 +0100 (CET)
From: Thomas Gleixner <tglx@linutronix.de>
To: "Pandruvada, Srinivas" <srinivas.pandruvada@intel.com>
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Subject: Re: [patch 00/12] thermal/x86_pkg_temp: Sanitize yet another hotplug
 and locking trainwreck
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On Mon, 21 Nov 2016, Pandruvada, Srinivas wrote:
> Your change below fixes the crash issue. Now I tested a case where the
> last cpu offlined from a package, it removed thermal zone and added
> zone back once any cpu from the package onlined. So this is working.
> 
> I want to try to run some workload on those cpu to bump up the
> temperature and check interrupts. I am hitting some issue unrelated to
> this change may be. I onlined three cpus from the package 1.
> 
> [189443.567728] smpboot: Booting Node 1 Processor 15 APIC 0x2e
> [189656.625947] smpboot: Booting Node 1 Processor 8 APIC 0x20
> [189829.545851] smpboot: Booting Node 1 Processor 24 APIC 0x21
> 
> But I can't schedule anything on those CPUs. For example now can't run
> turbostat, it complains
> "
> turbostat: re-initialized with num_cpus 19
> Could not migrate to CPU 8
> "
> 
> Same with
> 
> #taskset 0x100 stress -c 1
> taskset: failed to set pid 0's affinity: Invalid argument
> 
> I am on the latest linux-pm/linux-next tree on this server. I will
> switch to latest main line and try.

That must be something unrelated. I can use turbostat and taskset after
doing the above.

Thanks,

	tglx