linux-kernel - Re: [PULL 1/2] perf/tool: Fix usage of trace events with '-' in trace system name.

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Message-ID: <534E8576.3060907@de.ibm.com>
Date:	Wed, 16 Apr 2014 15:28:22 +0200
From:	Christian Borntraeger <borntraeger@...ibm.com>
To:	Jiri Olsa <jolsa@...hat.com>
CC:	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	linux-kernel@...r.kernel.org, KVM <kvm@...r.kernel.org>,
	Alexander Yarygin <yarygin@...ux.vnet.ibm.com>
Subject: Re: [PULL 1/2] perf/tool: Fix usage of trace events with '-' in trace
 system name.

On 16/04/14 15:00, Jiri Olsa wrote:
> On Wed, Apr 09, 2014 at 04:21:58PM +0200, Christian Borntraeger wrote:
>> From: Alexander Yarygin <yarygin@...ux.vnet.ibm.com>
>>
>> Trace events potentially can have a '-' in their trace system name,
>> e.g. kvm on s390 defines kvm-s390:* tracepoints.
>> tools/perf could not parse them, because there was no rule for this:
>> $ sudo ./perf top -e "kvm-s390:*"
>> invalid or unsupported event: 'kvm-s390:*'
>>
>> This patch allows '-' to be a part of PE_NAME token, so tracepoints
>> with '-' can be parsed by the event_legacy_tracepoint rule.
>> Without the patch, perf will not accept such tracepoints in the -e
>> option.
>>
>> Signed-off-by: Alexander Yarygin <yarygin@...ux.vnet.ibm.com>
>> Signed-off-by: Christian Borntraeger <borntraeger@...ibm.com>
>> ---
>>  tools/perf/util/parse-events.l |    2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/tools/perf/util/parse-events.l b/tools/perf/util/parse-events.l
>> index 3432995..ca20da7 100644
>> --- a/tools/perf/util/parse-events.l
>> +++ b/tools/perf/util/parse-events.l
>> @@ -199,7 +199,7 @@ r{num_raw_hex}		{ return raw(yyscanner); }
>>  {num_hex}		{ return value(yyscanner, 16); }
>>  
>>  {modifier_event}	{ return str(yyscanner, PE_MODIFIER_EVENT); }
>> -{name}			{ return str(yyscanner, PE_NAME); }
>> +{name_minus}			{ return str(yyscanner, PE_NAME); }
>>  "/"			{ BEGIN(config); return '/'; }
>>  -			{ return '-'; }
>>  ,			{ BEGIN(event); return ','; }
> 
> this breaks parsing of cache events like:
> 
>   $ perf record -e 'L1-dcache-loads' ls
> 
> also test 10 (same issue):
>   $ ./perf test 10
>   10: roundtrip evsel->name check                            : FAILED!
> 
> 
> it might be little tricky to fix, let me know if you
> have any troubles with that, I could look on it

Hmm, so do you prefer tackling this problem directly at  event_legacy_tracepoint, e.g.
like in
https://lkml.org/lkml/2014/3/24/364

Christian


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