linux-kernel - Re: [PATCH V4 18/24] perf tools: Add Intel BTS support

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Date:	Thu, 07 May 2015 10:05:28 +0300
From:	Adrian Hunter <adrian.hunter@...el.com>
To:	Arnaldo Carvalho de Melo <acme@...nel.org>
CC:	Peter Zijlstra <peterz@...radead.org>,
	linux-kernel@...r.kernel.org, David Ahern <dsahern@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Jiri Olsa <jolsa@...hat.com>,
	Namhyung Kim <namhyung@...il.com>,
	Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH V4 18/24] perf tools: Add Intel BTS support

On 06/05/15 16:35, Arnaldo Carvalho de Melo wrote:
> Em Wed, May 06, 2015 at 10:14:36AM +0300, Adrian Hunter escreveu:
>> Perhaps we should disallow intel_bts and intel_pt PMU events
>> explicitly and put that change back to v4.1 stable at least?
>>
>> I tried adding:
>>
>> diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c
>> index 244c66f..5d3ab7c 100644
>> --- a/tools/perf/util/pmu.c
>> +++ b/tools/perf/util/pmu.c
>> @@ -442,6 +442,10 @@ static struct perf_pmu *pmu_lookup(const char *name)
>>         LIST_HEAD(aliases);
>>         __u32 type;
>>  
>> +       /* No support for intel_bts or intel_pt so disallow them */
>> +       if (!strcmp(name, "intel_bts") || !strcmp(name, "intel_pt"))
>> +               return NULL;
>> +
>>         /*
>>          * The pmu data we store & need consists of the pmu
>>          * type value and format definitions. Load both right
>>
>>
>> And now I get:
>>
>> $ tools/perf/perf record -e intel_bts//u ls
>> invalid or unsupported event: 'intel_bts//u'
>> Run 'perf list' for a list of valid events
> 
> Unsure, when did we start accepting intel_bts in event names? In this patchkit?

Any old version of perf tools will accept PMU names as events. It validates
against /sys/bus/event_source/devices.

So "intel_pt" and "intel_bts" will turn up in v4.1, so I was suggesting
disallowing them in perf tools for v4.1 since there is no tool support until
v4.2.

> 
> - Arnaldo
>  
>>  usage: perf record [<options>] [<command>]
>>     or: perf record [<options>] -- <command> [<options>]
>>
>>     -e, --event <event>   event selector. use 'perf list' to list available events
>>
>>
> 
> 

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