From: Avi Kivity <avi@redhat.com>
To: Alexander Graf <agraf@suse.de>
Cc: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>,
Marcelo Tosatti <mtosatti@redhat.com>,
LKML <linux-kernel@vger.kernel.org>, KVM <kvm@vger.kernel.org>
Subject: Re: [PATCH] KVM: don't sent IPI if the vcpu is not online
Date: Mon, 06 Sep 2010 12:14:43 +0300 [thread overview]
Message-ID: <4C84B103.7020603@redhat.com> (raw)
In-Reply-To: <F83E94AF-6BB0-4653-A81F-7D9F7D0B9E12@suse.de>
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
next prev parent reply other threads:[~2010-09-06 9:14 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-09-03 4:12 [PATCH] KVM: don't sent IPI if the vcpu is not online Xiao Guangrong
2010-09-05 7:18 ` Avi Kivity
2010-09-06 1:48 ` Xiao Guangrong
2010-09-06 5:46 ` Avi Kivity
2010-09-06 8:51 ` Alexander Graf
2010-09-06 8:55 ` Avi Kivity
2010-09-06 8:59 ` Alexander Graf
2010-09-06 9:05 ` Avi Kivity
2010-09-06 9:09 ` Alexander Graf
2010-09-06 9:14 ` Avi Kivity [this message]
2010-09-06 9:19 ` Alexander Graf
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