linux-kernel - Re: [PATCH v2 4/5] KVM: s390: vsie: Move conditional reschedule

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Date:   Tue, 7 Apr 2020 12:52:14 +0200
From:   Claudio Imbrenda <imbrenda@...ux.ibm.com>
To:     David Hildenbrand <david@...hat.com>
Cc:     kvm@...r.kernel.org, linux-s390@...r.kernel.org,
        linux-kernel@...r.kernel.org, Vasily Gorbik <gor@...ux.ibm.com>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        Cornelia Huck <cohuck@...hat.com>,
        Janosch Frank <frankja@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ibm.com>
Subject: Re: [PATCH v2 4/5] KVM: s390: vsie: Move conditional reschedule

On Fri,  3 Apr 2020 17:30:49 +0200
David Hildenbrand <david@...hat.com> wrote:

> Let's move it to the outer loop, in case we ever run again into long
> loops, trying to map the prefix. While at it, convert it to
> cond_resched().
> 
> Signed-off-by: David Hildenbrand <david@...hat.com>
> ---
>  arch/s390/kvm/vsie.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/arch/s390/kvm/vsie.c b/arch/s390/kvm/vsie.c
> index 4f6c22d72072..ef05b4e167fb 100644
> --- a/arch/s390/kvm/vsie.c
> +++ b/arch/s390/kvm/vsie.c
> @@ -1000,8 +1000,6 @@ static int do_vsie_run(struct kvm_vcpu *vcpu,
> struct vsie_page *vsie_page) 
>  	handle_last_fault(vcpu, vsie_page);
>  
> -	if (need_resched())
> -		schedule();
>  	if (test_cpu_flag(CIF_MCCK_PENDING))
>  		s390_handle_mcck();
>  
> @@ -1185,6 +1183,7 @@ static int vsie_run(struct kvm_vcpu *vcpu,
> struct vsie_page *vsie_page) kvm_s390_vcpu_has_irq(vcpu, 0) ||
>  		    kvm_s390_vcpu_sie_inhibited(vcpu))
>  			break;
> +		cond_resched();
>  	}
>  
>  	if (rc == -EFAULT) {

Reviewed-by: Claudio Imbrenda <imbrenda@...ux.ibm.com>