linux-kernel - Re: [PATCH v3 1/3] KVM: fix rcu usage warning in kvm_arch_vcpu_ioctl_set

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Message-ID: <4D40D9F7.6000006@cn.fujitsu.com>
Date:	Thu, 27 Jan 2011 10:35:35 +0800
From:	Xiao Guangrong <xiaoguangrong@...fujitsu.com>
To:	Marcelo Tosatti <mtosatti@...hat.com>
CC:	Avi Kivity <avi@...hat.com>, LKML <linux-kernel@...r.kernel.org>,
	KVM <kvm@...r.kernel.org>
Subject: Re: [PATCH v3 1/3] KVM: fix rcu usage warning in kvm_arch_vcpu_ioctl_set_sregs()

On 01/20/2011 11:27 PM, Marcelo Tosatti wrote:

>> Sure :-), there is the simply test result of kernbench:
>>
>> Before patch:
>>
>> real    5m6.493s                                                                
>> user    3m57.847s                                                               
>> sys     9m7.115s 
>>
>> real    5m1.750s                                                                
>> user    4m0.109s                                                                
>> sys     9m10.192s       
>>
>>
>> After patch:
>> real    5m0.140s                                                                
>> user    3m57.956s                                                               
>> sys     8m58.339s  
>>
>> real    4m56.314s                                                               
>> user    4m0.303s                                                                
>> sys     8m55.774s  
> 
> Nice. One disadvantageous side effect for the kvm_vcpu_kick path 
> is that it can race with make_all_cpus_request, which is possibly
> doing unrelated, slower work (IPI'ing other vcpus, waiting for
> response).
> 
> Looks ok, but lets wait for more careful reviews before applying.
> 

Hi Avi, Marcelo,

I shall on vacation from 1.25 to 2.9, if you have comments on it i'll
replay after coming back. :-)

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