linux-kernel - Re: [PATCH] KVM: don't sent IPI if the vcpu is not online

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Message-ID: <4C84B103.7020603@redhat.com>
Date:	Mon, 06 Sep 2010 12:14:43 +0300
From:	Avi Kivity <avi@...hat.com>
To:	Alexander Graf <agraf@...e.de>
CC:	Xiao Guangrong <xiaoguangrong@...fujitsu.com>,
	Marcelo Tosatti <mtosatti@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>, KVM <kvm@...r.kernel.org>
Subject: Re: [PATCH] KVM: don't sent IPI if the vcpu is not online

  On 09/06/2010 12:09 PM, Alexander Graf wrote:
>
>> It can also be running host kernel or user code.
> In that case it's the same as running guest code, no? We'll pass by the vcpu entry check asap.

Sure, but the IPI is wasted.  If you spend 10% of your time in host 
code, you can avoid 10% of the IPIs.

(actually less, since the atomic part of the guest switch has guest_mode 
enabled)

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

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