From mboxrd@z Thu Jan  1 00:00:00 1970
From: Avi Kivity <avi@redhat.com>
Subject: Re: [PATCH] KVM: don't sent IPI if the vcpu is not online
Date: Mon, 06 Sep 2010 12:14:43 +0300
Message-ID: <4C84B103.7020603@redhat.com>
References: <4C807593.1050903@cn.fujitsu.com> <4C83445B.4020103@redhat.com> <4C844887.9090802@cn.fujitsu.com> <4C84801F.9060803@redhat.com> <DCCDD62D-CE92-453A-BB3C-DF878D893C3F@suse.de> <4C84AC6B.4090306@redhat.com> <633F01D5-D6AD-40F3-8864-C3AE4D314E30@suse.de> <4C84AEF5.2070309@redhat.com> <F83E94AF-6BB0-4653-A81F-7D9F7D0B9E12@suse.de>
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Cc: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>,
	Marcelo Tosatti <mtosatti@redhat.com>,
	LKML <linux-kernel@vger.kernel.org>, KVM <kvm@vger.kernel.org>
To: Alexander Graf <agraf@suse.de>
Return-path: <linux-kernel-owner@vger.kernel.org>
In-Reply-To: <F83E94AF-6BB0-4653-A81F-7D9F7D0B9E12@suse.de>
Sender: linux-kernel-owner@vger.kernel.org
List-Id: kvm.vger.kernel.org

  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