Re: kvm-s390: Dont exit SIE on SIGP sense running

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Am Montag 21 Juni 2010, 10:27:50 schrieb Avi Kivity:
[...]
> >   	VCPU_EVENT(vcpu, 3, "%s", "free cpu");
> > +	clear_bit(63 - vcpu->vcpu_id, (unsigned long *)&vcpu->kvm->arch.sca->mcn);
> >   	if (vcpu->kvm->arch.sca->cpu[vcpu->vcpu_id].sda ==
> >   		(__u64) vcpu->arch.sie_block)
> >   		vcpu->kvm->arch.sca->cpu[vcpu->vcpu_id].sda = 0;
> >    
> 
> Unrelated, do these VCPU_EVENTs want to become ftrace tracepoints?
> 
> 

Hmm, dont know. Currently this calls into a s390 debug tracing facility
(arch/s390/kernel/debug.c) which is heavily used by our service folks.
There are commands for crash and lcrash to show these s390 debug traces
from a dump.

Maybe its worth to investigate if we should change some of these events to
have both ftrace-tracepoints and the debug traces.

Christian
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