linux-kernel - Re: [PATCH/RFC] stop_machine: make stop_machine

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Message-Id: <200805081823.35696.borntraeger@de.ibm.com>
Date:	Thu, 8 May 2008 18:23:35 +0200
From:	Christian Borntraeger <borntraeger@...ibm.com>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	Rusty Russell <rusty@...tcorp.com.au>,
	kvm-devel@...ts.sourceforge.net, Ingo Molnar <mingo@...e.hu>,
	linux-kernel@...r.kernel.org,
	virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH/RFC] stop_machine: make stop_machine_run more virtualization friendly

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.
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