linux-kernel - Re: [PATCH v3 1/4] perf pmu: Support more complex PMU event aliasing

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Message-ID: <5add76dc-ea92-9778-a65b-792f3ff17040@huawei.com>
Date:   Fri, 28 Jun 2019 18:05:43 +0100
From:   John Garry <john.garry@...wei.com>
To:     Andi Kleen <ak@...ux.intel.com>
CC:     <peterz@...radead.org>, <mingo@...hat.com>, <acme@...nel.org>,
        <alexander.shishkin@...ux.intel.com>, <jolsa@...hat.com>,
        <namhyung@...nel.org>, <tmricht@...ux.ibm.com>,
        <brueckner@...ux.ibm.com>, <kan.liang@...ux.intel.com>,
        <ben@...adent.org.uk>, <mathieu.poirier@...aro.org>,
        <mark.rutland@....com>, <will.deacon@....com>,
        <linux-kernel@...r.kernel.org>, <linuxarm@...wei.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <zhangshaokun@...ilicon.com>
Subject: Re: [PATCH v3 1/4] perf pmu: Support more complex PMU event aliasing

On 28/06/2019 16:33, Andi Kleen wrote:
>> +	/*
>> +	 * Match more complex aliases where the alias name is a comma-delimited
>> +	 * list of tokens, orderly contained in the matching PMU name.
>> +	 *
>> +	 * Example: For alias "socket,pmuname" and PMU "socketX_pmunameY", we
>> +	 *	    match "socket" in "socketX_pmunameY" and then "pmuname" in
>> +	 *	    "pmunameY".
>
> This needs to be documented in some manpage.

Hi Andi,

As I see, today the man page does not mention the matching from the 
alias events declared in the jsons.

The perf list command shows these aliases, so I am not sure how useful 
that info is adding to the man page.

What the man page does mention is the glob matching on the PMU device 
name - like how "imc" can match PMU device "uncore_imc_0", but I'm not 
changing around this.

Thanks,
John

>
> -Andi
>
>
> .
>