linux-kernel - Re: [PATCH v2 2/3] Support for perf to probe into SDT markers:

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Date:	Tue, 08 Oct 2013 19:00:42 +0530
From:	Hemant <hkshaw@...ux.vnet.ibm.com>
To:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
CC:	linux-kernel@...r.kernel.org, srikar@...ux.vnet.ibm.com,
	peterz@...radead.org, oleg@...hat.com,
	hegdevasant@...ux.vnet.ibm.com, mingo@...hat.com, anton@...hat.com,
	systemtap@...rceware.org, namhyung@...nel.org,
	aravinda@...ux.vnet.ibm.com
Subject: Re: [PATCH v2 2/3] Support for perf to probe into SDT markers:

On 10/08/2013 05:17 PM, Masami Hiramatsu wrote:
> (2013/10/07 15:48), Hemant Kumar wrote:
>> [...]
>> diff --git a/tools/perf/builtin-probe.c b/tools/perf/builtin-probe.c
>> index cbd2383..6f09723 100644
>> --- a/tools/perf/builtin-probe.c
>> +++ b/tools/perf/builtin-probe.c
>> @@ -370,6 +370,17 @@ int cmd_probe(int argc, const char **argv, const char *prefix __maybe_unused)
>>   			pr_err("Error: Don't use --markers with --funcs.\n");
>>   			usage_with_options(probe_usage, options);
>>   		}
>> +		if (params.mod_events) {
>> +			ret = add_perf_probe_events(params.events,
>> +						    params.nevents,
>> +						    params.max_probe_points,
>> +						    params.target,
>> +						    params.force_add);
>> +			if (ret < 0) {
>> +				pr_err(" Error: Failed to add events. "
>> +				       " (%d)\n", ret);
>> +			}
>> +		}
> What is this code for? params.sdt is true only if "--markers" is set, and that
> should not be used with --add and --del, because it's an action "query markers".
> We should give an error and abort here.

Yeah, I see your point. We should not add an event in this case. Instead 
an error should be displayed. Thanks for pointing that. And we already 
have add_perf_probe_events() call. That should be called instead.

>
> Other points are covered by Namhyung's review(thanks!).
>
> Thank you!
>
Yeah, will make the required changes and post the next iteration ASAP.

-- 
Thanks
Hemant

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