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From: Christian Borntraeger <borntraeger@de.ibm.com>
To: Jeremy Fitzhardinge <jeremy@goop.org>
Subject: Re: [PATCH/RFC] stop_machine: make stop_machine_run more virtualization friendly
Date: Thu, 8 May 2008 18:23:35 +0200
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Cc: Rusty Russell <rusty@rustcorp.com.au>, kvm-devel@lists.sourceforge.net,
       Ingo Molnar <mingo@elte.hu>, linux-kernel@vger.kernel.org,
       virtualization@lists.linux-foundation.org
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Am Donnerstag, 8. Mai 2008 schrieb Jeremy Fitzhardinge:
> > Sorry, forgot to mention. Its kvm.git from 2 days ago on s390.
> >   
> 
> And on s390 cpu_relax yields the vcpu?  That's not common behaviour 
> across architectures.


Yes, cpu_relax on s390 calls diagnose 44. Diagnose 44 translates to yield on 
z/VM and LPAR. Guessing from the number of the diagnose, I think it was used 
on z/VM for timeslice yielding long before Linux came to s390.