linux-kernel - Re: [RFC -v4 PATCH 3/3] kvm: use yield_to instead of sleep in kvm_vcpu_on

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Message-ID: <4D2F946C.9040204@redhat.com>
Date:	Thu, 13 Jan 2011 19:10:20 -0500
From:	Rik van Riel <riel@...hat.com>
To:	Avi Kivity <avi@...hat.com>
CC:	kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Mike Galbraith <efault@....de>,
	Chris Wright <chrisw@...s-sol.org>
Subject: Re: [RFC -v4 PATCH 3/3] kvm: use yield_to instead of sleep in kvm_vcpu_on_spin

On 01/13/2011 10:23 AM, Avi Kivity wrote:
> On 01/13/2011 05:06 PM, Rik van Riel wrote:
>>
>>> I think the first patch needs some reference counting... I'd move it to
>>> the outermost KVM_RUN loop to reduce the performance impact.
>>
>> I don't see how refcounting from that other thread could
>> possibly help, and I now see that the task_struct_cachep
>> does not have SLAB_DESTROY_BY_LRU, either :(
>>
>> What do you have in mind here that would both work and
>> be acceptable to you as KVM maintainer?
>>
>
> I think a 'struct pid' fits the bill here.

Indeed it does.   New patches on the way later, after I have
tested them some more.

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