linux-kernel - Re: [PATCH 26/31] perf tools: Support perf event alias name

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Date:	Thu, 22 Oct 2015 15:59:39 +0800
From:	"Wangnan (F)" <wangnan0@...wei.com>
To:	Namhyung Kim <namhyung@...nel.org>
CC:	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Alexei Starovoitov <ast@...mgrid.com>,
	Brendan Gregg <brendan.d.gregg@...il.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Daniel Borkmann <daniel@...earbox.net>,
	David Ahern <dsahern@...il.com>, He Kuang <hekuang@...wei.com>,
	Jiri Olsa <jolsa@...nel.org>, Li Zefan <lizefan@...wei.com>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Paul Mackerras <paulus@...ba.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	pi3orama <pi3orama@....com>,
	xiakaixu 00238161 <xiakaixu@...wei.com>,
	"Arnaldo Carvalho de Melo" <acme@...hat.com>
Subject: Re: [PATCH 26/31] perf tools: Support perf event alias name



On 2015/10/22 15:53, Namhyung Kim wrote:
> On Thu, Oct 22, 2015 at 4:29 PM, Wangnan (F) <wangnan0@...wei.com> wrote:
>>

[SNIP]
>>> I understand the need of using aliases but I think it's more natural
>>> to use event name for simple cases..
>>
>> I will consider this. However, if we allow using event name directly like
>> this:
>>
>>   # perf record -e cycles -e test_pmu.c/myevent=cycles/ ...
>>
>> Then two '-e' seems redundant, right? Why not directly using:
>>
>>   # perf record -e test_pmu.c/myevent=cycles/ ...
>>
>> and make perf creates cycles event for test_pmu.c?
>>
>> We can make syntax like
>>
>>   # perf record -e test_pmu.c/myevent=cycles/ ...
>>
>> as a syntax sugar of
>>
>>   # perf record -e randomname=cycles -e test_pmu.c/myevent=randomname/ ...
>>
>> and don't need to find evsel through their names if alias not exist.
>>
>> So this is a new feature, and worth another patch.
>>
>> Thought?
> Not sure it's worth.  It can confuse users IMHO.
>
> Isn't it enough to give them in a single argument?
>
>    # perf record -e cycles,test_pmu.c/myevent=cycles/

OK. I have put it on my todo-list.

Thank you.
> Thanks,
> Namhyung


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