linux-kernel - Re: [PATCH V6 2/5] perf/x86/kvm: Avoid unnecessary work in guest filtering

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Date:   Mon, 4 Feb 2019 11:18:40 -0500
From:   "Liang, Kan" <kan.liang@...ux.intel.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     x86@...nel.org, linux-kernel@...r.kernel.org, tglx@...utronix.de,
        bp@...en8.de, mingo@...hat.com, ak@...ux.intel.com,
        eranian@...gle.com
Subject: Re: [PATCH V6 2/5] perf/x86/kvm: Avoid unnecessary work in guest
 filtering



On 2/4/2019 11:15 AM, Peter Zijlstra wrote:
> On Mon, Feb 04, 2019 at 10:43:41AM -0500, Liang, Kan wrote:
>>> --- a/arch/x86/events/intel/ds.c
>>> +++ b/arch/x86/events/intel/ds.c
>>> @@ -1628,6 +1628,7 @@ void __init intel_ds_init(void)
>>>    	x86_pmu.bts  = boot_cpu_has(X86_FEATURE_BTS);
>>>    	x86_pmu.pebs = boot_cpu_has(X86_FEATURE_PEBS);
>>>    	x86_pmu.pebs_buffer_size = PEBS_BUFFER_SIZE;
>>> +	x86_pmu.pebs_no_isolation = 1;
>>
>> We will submit the Icelake support soon (probably next week).
>> That will be a problem for Icelake.
> 
> We can have ICL set it to 0 explicitly, but explicitly setting it to 1
> _11_ times is just silly.
> 
> Also, what perfmon version will ICL have? If it were to be 5 we could
> key off of that.
>

Right, we can use perfmon version here. I will apply it in V7.

Thanks,
Kan