From mboxrd@z Thu Jan  1 00:00:00 1970
From: Avi Kivity <avi@redhat.com>
Subject: Re: kvm-s390: Dont exit SIE on SIGP sense running
Date: Mon, 21 Jun 2010 11:27:50 +0300
Message-ID: <4C1F2286.7090108@redhat.com>
References: <201006172316.21684.borntraeger@de.ibm.com>
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Cc: Marcelo Tosatti <mtosatti@redhat.com>, kvm@vger.kernel.org,
	Heiko Carstens <heiko.carstens@de.ibm.com>,
	Martin Schwidefsky <schwidefsky@de.ibm.com>,
	Carsten Otte <cotte@de.ibm.com>
To: Christian Borntraeger <borntraeger@de.ibm.com>
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On 06/18/2010 12:16 AM, Christian Borntraeger wrote:
> Avi, Marcello,
>
> Newer (guest) kernels use sigp sense running in their spinlock
> implementation to check if the other cpu is running before yielding
> the processor. This revealed some wrong guest settings, causing
> unnecessary exits for every sigp sense running.
>    

Applied, thanks.

>   void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
>   {
>   	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?

-- 
error compiling committee.c: too many arguments to function