linux-kernel - Re: [PATCH 1/3] perf, core: Introduce attrs to count in either host or guest mode

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Date:	Wed, 11 May 2011 14:45:27 +0300
From:	Avi Kivity <avi@...hat.com>
To:	Joerg Roedel <joerg.roedel@....com>
CC:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>, Ingo Molnar <mingo@...e.hu>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Subject: Re: [PATCH 1/3] perf, core: Introduce attrs to count in either host
 or guest mode

On 05/11/2011 02:44 PM, Avi Kivity wrote:
> On 05/10/2011 05:35 PM, Joerg Roedel wrote:
>> The two new attributes exclude_guest and exclude_host can
>> bes used by user-space to tell the kernel to setup
>> performance counter to either only count while the CPU is in
>> guest or in host mode.
>> An additional check is also introduced to make sure
>> user-space does not try to exclude guest and host mode from
>> counting.
>>
>> @@ -217,7 +217,10 @@ struct perf_event_attr {
>>                   mmap_data      :  1, /* non-exec mmap data    */
>>                   sample_id_all  :  1, /* sample_type all events */
>>
>> -                __reserved_1   : 45;
>> +                exclude_host   :  1, /* don't count in host   */
>> +                exclude_guest  :  1, /* don't count in guest  */
>> +
>> +                __reserved_1   : 43;
>>
>
> We have exclude_hv a few lines up, so only exclude_guest is needed.
>

Well, actually, that depends on the meaning of exclude_hv.

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

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