linux-kernel - Re: [PATCH v3 2/4] KVM: use simple waitqueue for vcpu->wq

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Message-ID: <56266074.8050707@redhat.com>
Date:	Tue, 20 Oct 2015 17:40:36 +0200
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	Peter Zijlstra <peterz@...radead.org>,
	Daniel Wagner <daniel.wagner@...-carit.de>
Cc:	linux-kernel@...r.kernel.org, linux-rt-users@...r.kernel.org,
	Marcelo Tosatti <mtosatti@...hat.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH v3 2/4] KVM: use simple waitqueue for vcpu->wq



On 20/10/2015 16:00, Peter Zijlstra wrote:
>> > -		prepare_to_wait(&vcpu->wq, &wait, TASK_INTERRUPTIBLE);
>> > +		prepare_to_swait(&vcpu->wq, &wait, TASK_INTERRUPTIBLE);
>> >  
>> >  		if (kvm_vcpu_check_block(vcpu) < 0)
>> >  			break;
>> > @@ -2028,7 +2027,7 @@ void kvm_vcpu_block(struct kvm_vcpu *vcpu)
>> >  		schedule();
>> >  	}
>> >  
>> > -	finish_wait(&vcpu->wq, &wait);
>> > +	finish_swait(&vcpu->wq, &wait);
>> >  	cur = ktime_get();
>> >  
>> >  out:
> Should we not take this opportunity to get rid of these open-coded wait
> loops?

I find them way more readable than a 6-argument __wait_event...

I've forwarded your remark about kvmppc_vcore_blocked to the kvm-ppc
maintainers.

Thanks,

Paolo
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