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

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Date:	Wed, 23 Apr 2014 14:34:38 +0200
From:	Christian Borntraeger <borntraeger@...ibm.com>
To:	Jiri Olsa <jolsa@...hat.com>,
	Alexander Yarygin <yarygin@...ux.vnet.ibm.com>
CC:	Paolo Bonzini <pbonzini@...hat.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	KVM <kvm@...r.kernel.org>,
	linux-s390 <linux-s390@...r.kernel.org>,
	Cornelia Huck <cornelia.huck@...ibm.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] perf/tool: Fix usage of trace events with '-' in trace
 system name.

On 23/04/14 13:45, Jiri Olsa wrote:
> On Mon, Apr 21, 2014 at 07:43:50PM +0400, Alexander Yarygin wrote:
[...]
>> And a bit of offtopic :)
>> Apparently, s390 doesn't have syscalls:*, so some of the tests
>> don't work properly (or maybe I missed something? I set CONFIG_FTRACE_SYSCALLS
>> to 'y' in my config: still no syscalls:*).

Strange, on my system I have syscall trace points on s390.
Maybe some additional dependency of CONFIG_FTRACE_SYSCALLS that is not catched
via Kconfig?

>>
>> What do you think about this idea:
>>
>> --- a/tools/perf/tests/parse-events.c
>> +++ b/tools/perf/tests/parse-events.c
>> @@ -1177,13 +1177,21 @@ struct evlist_test {
>>  	int (*check)(struct perf_evlist *evlist);
>>  };
>>
>> +#if !defined(__s390x__)
>> +#define TP_SYS_NAME "syscalls"
>> +#define TP_EVENT_NAME "sys_enter_open"
>> +#else
>> +#define TP_SYS_NAME "sched"
>> +#define TP_EVENT_NAME "sched_wakeup"
>> +#endif
>> +
>>  static struct evlist_test test__events[] = {
>>  	[0] = {
>> -		.name  = "syscalls:sys_enter_open",
>> +		.name  = TP_SYS_NAME ":" TP_EVENT_NAME,
>>  		.check = test__checkevent_tracepoint,
>>  	},
>>
>> ... and so on?
> 
> that looks fine.. also we could use just generic tracepoints
> like the 'sched' ones

I think generic tracepoints are preferred over ifdef, but as I said I have syscalls.

Christian

Christian




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