linux-kernel - Re: [PATCH V5 08/12] perf/x86/intel: Add Icelake support

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Message-ID: <4ff8fec9-fb41-b11d-b7ed-4c716b558adc@linux.intel.com>
Date:   Mon, 8 Apr 2019 11:45:59 -0400
From:   "Liang, Kan" <kan.liang@...ux.intel.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     acme@...nel.org, mingo@...hat.com, linux-kernel@...r.kernel.org,
        tglx@...utronix.de, jolsa@...nel.org, eranian@...gle.com,
        alexander.shishkin@...ux.intel.com, ak@...ux.intel.com
Subject: Re: [PATCH V5 08/12] perf/x86/intel: Add Icelake support



On 4/8/2019 11:06 AM, Peter Zijlstra wrote:
> On Tue, Apr 02, 2019 at 12:45:05PM -0700, kan.liang@...ux.intel.com wrote:
>> +static struct event_constraint *
>> +icl_get_event_constraints(struct cpu_hw_events *cpuc, int idx,
>> +			  struct perf_event *event)
>> +{
>> +	/*
>> +	 * Fixed counter 0 has less skid.
>> +	 * Force instruction:ppp in Fixed counter 0
>> +	 */
>> +	if ((event->attr.precise_ip == 3) &&
>> +	    ((event->hw.config & X86_RAW_EVENT_MASK) == 0x00c0))
>> +		return &fixed_counter0_constraint;
> 
> Does that want to be:
> 
> 		event->hw.config == X86_CONFIG(.event=0xc0)
> 
> ?
> 
> That is, are there really bits we want to mask in there?

For instruction event, right, we don't need mask it.
I will change it.

Thanks,
Kan

> 
>> +
>> +	return hsw_get_event_constraints(cpuc, idx, event);
>> +}