linux-kernel - Re: [PATCH RFC V2 4/5] kvm guest : Added configuration support to enable debug information for KVM Guests

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Date:	Tue, 25 Oct 2011 11:30:21 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Avi Kivity <avi@...hat.com>
CC:	Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>,
	Greg Kroah-Hartman <gregkh@...e.de>, KVM <kvm@...r.kernel.org>,
	Sedat Dilek <sedat.dilek@...il.com>,
	Ingo Molnar <mingo@...hat.com>,
	Virtualization <virtualization@...ts.linux-foundation.org>,
	"x86@...nel.org" <x86@...nel.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Dave Jiang <dave.jiang@...el.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Stefano Stabellini <Stefano.Stabellini@...citrix.com>,
	Gleb Natapov <gleb@...hat.com>,
	Yinghai Lu <yinghai@...nel.org>,
	Marcelo Tosatti <mtosatti@...hat.com>,
	Xen <xen-devel@...ts.xensource.com>,
	Rik van Riel <riel@...hat.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Suzuki Poulose <suzuki@...ux.vnet.ibm.com>,
	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH RFC V2 4/5] kvm guest : Added configuration support to
 enable debug information for KVM Guests

On 10/24/2011 03:15 AM, Avi Kivity wrote:
> On 10/23/2011 09:07 PM, Raghavendra K T wrote:
>> Added configuration support to enable debug information
>> for KVM Guests in debugfs
>>     
>> Signed-off-by: Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>
>> Signed-off-by: Suzuki Poulose <suzuki@...ibm.com>
>> Signed-off-by: Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>
>> ---
>> diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
>> index 1f03f82..ed34269 100644
>> --- a/arch/x86/Kconfig
>> +++ b/arch/x86/Kconfig
>> @@ -562,6 +562,15 @@ config KVM_GUEST
>>  	  This option enables various optimizations for running under the KVM
>>  	  hypervisor.
>>  
>> +config KVM_DEBUG_FS
>> +	bool "Enable debug information for KVM Guests in debugfs"
>> +	depends on KVM_GUEST
>> +	default n
>> +	---help---
>> +	  This option enables collection of various statistics for KVM guest.
>> +   	  Statistics are displayed in debugfs filesystem. Enabling this option
>> +	  may incur significant overhead.
>> +
>>  source "arch/x86/lguest/Kconfig"
>>  
>>
> This might be better implemented through tracepoints, which an be
> enabled dynamically.

Tracepoints use spinlocks, so that could get awkward.

    J

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