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From: "Wangnan (F)" <wangnan0@huawei.com>
To: Namhyung Kim <namhyung@kernel.org>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>,
	Alexei Starovoitov <ast@plumgrid.com>,
	Brendan Gregg <brendan.d.gregg@gmail.com>,
	Peter Zijlstra <a.p.zijlstra@chello.nl>,
	Daniel Borkmann <daniel@iogearbox.net>,
	David Ahern <dsahern@gmail.com>, He Kuang <hekuang@huawei.com>,
	Jiri Olsa <jolsa@kernel.org>, Li Zefan <lizefan@huawei.com>,
	Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>,
	Paul Mackerras <paulus@samba.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	pi3orama <pi3orama@163.com>,
	xiakaixu 00238161 <xiakaixu@huawei.com>,
	"Arnaldo Carvalho de Melo" <acme@redhat.com>
Subject: Re: [PATCH 26/31] perf tools: Support perf event alias name
Date: Thu, 22 Oct 2015 15:59:39 +0800	[thread overview]
Message-ID: <5628976B.8030207@huawei.com> (raw)
In-Reply-To: <CAM9d7cgK=zkyS_Krqq+N85LKD-13O6dpXSeygs4SVq60WURNpw@mail.gmail.com>



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



  reply	other threads:[~2015-10-22  8:06 UTC|newest]

Thread overview: 92+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-10-14 12:41 [GIT PULL 00/31] perf tools: filtering events using eBPF programs Wang Nan
2015-10-14 12:41 ` [PATCH 01/31] perf tools: Make perf depend on libbpf Wang Nan
2015-10-29 12:21   ` [tip:perf/core] " tip-bot for Wang Nan
2015-10-14 12:41 ` [PATCH 02/31] perf ebpf: Add the libbpf glue Wang Nan
2015-10-29 12:21   ` [tip:perf/core] " tip-bot for Wang Nan
2015-10-14 12:41 ` [PATCH 03/31] perf tools: Enable passing bpf object file to --event Wang Nan
2015-10-20 15:12   ` Arnaldo Carvalho de Melo
2015-10-20 15:15     ` Arnaldo Carvalho de Melo
2015-10-20 15:42       ` Arnaldo Carvalho de Melo
2015-10-21  2:01         ` Wangnan (F)
2015-10-21  1:55       ` Wangnan (F)
2015-10-29 12:22   ` [tip:perf/core] " tip-bot for Wang Nan
2015-10-14 12:41 ` [PATCH 04/31] perf record, bpf: Create probe points for BPF programs Wang Nan
2015-10-20 19:12   ` Arnaldo Carvalho de Melo
2015-10-20 19:16     ` David Ahern
2015-10-20 19:21       ` Arnaldo Carvalho de Melo
2015-10-20 20:34     ` Arnaldo Carvalho de Melo
2015-10-21  2:27     ` Wangnan (F)
2015-10-21  3:31     ` Wangnan (F)
2015-10-21 13:28       ` Arnaldo Carvalho de Melo
2015-10-22 16:13         ` Arnaldo Carvalho de Melo
2015-10-29 12:22   ` [tip:perf/core] perf tools: " tip-bot for Wang Nan
2015-10-14 12:41 ` [PATCH 05/31] perf record: Load eBPF object into kernel Wang Nan
2015-10-23 16:58   ` Arnaldo Carvalho de Melo
2015-10-24  0:27     ` Arnaldo Carvalho de Melo
2015-10-26  7:18       ` Wangnan (F)
2015-10-24  1:18     ` pi3orama
2015-10-29 12:22   ` [tip:perf/core] perf tools: " tip-bot for Wang Nan
2015-10-14 12:41 ` [PATCH 06/31] perf tools: Collect perf_evsel in BPF object files Wang Nan
2015-10-29 12:23   ` [tip:perf/core] perf bpf: " tip-bot for Wang Nan
2015-10-14 12:41 ` [PATCH 07/31] perf tools: Attach eBPF program to perf event Wang Nan
2015-10-30  9:13   ` [tip:perf/core] perf bpf: Attach eBPF filter " tip-bot for Wang Nan
2015-10-14 12:41 ` [PATCH 08/31] perf record: Add clang options for compiling BPF scripts Wang Nan
2015-10-30  9:14   ` [tip:perf/core] " tip-bot for Wang Nan
2015-10-14 12:41 ` [PATCH 09/31] perf tools: Compile scriptlets to BPF objects when passing '.c' to --event Wang Nan
2015-10-14 15:45   ` Namhyung Kim
2015-10-15  2:10     ` Wangnan (F)
2015-10-29 16:25   ` Arnaldo Carvalho de Melo
2015-10-29 16:30     ` Arnaldo Carvalho de Melo
2015-10-29 22:52       ` Arnaldo Carvalho de Melo
2015-10-30  9:14   ` [tip:perf/core] " tip-bot for Wang Nan
2015-10-14 12:41 ` [PATCH 10/31] perf test: Enforce LLVM test for BPF test Wang Nan
2015-10-14 15:48   ` Namhyung Kim
2015-10-15 11:58     ` Wangnan (F)
2015-11-03 18:24       ` Arnaldo Carvalho de Melo
2015-11-04  1:41         ` Wangnan (F)
2015-10-29 22:37   ` Arnaldo Carvalho de Melo
2015-10-31  5:31     ` Wangnan (F)
2015-10-14 12:41 ` [PATCH 11/31] perf test: Add 'perf test BPF' Wang Nan
2015-10-14 12:41 ` [PATCH 12/31] perf probe: Reset args and nargs for probe_trace_event when failure Wang Nan
2015-10-29 22:39   ` Arnaldo Carvalho de Melo
2015-10-30 10:24   ` 平松雅巳 / HIRAMATU，MASAMI
2015-10-14 12:41 ` [PATCH 13/31] bpf tools: Load a program with different instances using preprocessor Wang Nan
2015-10-29 22:44   ` Arnaldo Carvalho de Melo
2015-10-31 10:40     ` Wangnan (F)
2015-10-14 12:41 ` [PATCH 14/31] perf tools: Add BPF_PROLOGUE config options for further patches Wang Nan
2015-10-29 22:45   ` Arnaldo Carvalho de Melo
2015-10-14 12:41 ` [PATCH 15/31] perf tools: Compile dwarf-regs.c if CONFIG_BPF_PROLOGUE is on Wang Nan
2015-10-14 12:41 ` [PATCH 16/31] perf tools: Add prologue for BPF programs for fetching arguments Wang Nan
2015-10-15  5:26   ` Namhyung Kim
2015-10-15 11:56     ` Wangnan (F)
2015-10-14 12:41 ` [PATCH 17/31] perf tools: Generate prologue for BPF programs Wang Nan
2015-10-14 12:41 ` [PATCH 18/31] perf tools: Use same BPF program if arguments are identical Wang Nan
2015-10-14 12:41 ` [PATCH 19/31] perf record: Support custom vmlinux path Wang Nan
2015-10-14 12:41 ` [PATCH 20/31] perf tools: Allow BPF program attach to uprobe events Wang Nan
2015-10-27  2:28   ` Wangnan (F)
2015-10-27  3:07     ` [PATCH] perf tools: Allow BPF program attach to modules Wang Nan
2015-10-14 12:41 ` [PATCH 21/31] perf test: Enforce LLVM test, add kbuild test Wang Nan
2015-10-19 14:42   ` Namhyung Kim
2015-10-19 14:53     ` Arnaldo Carvalho de Melo
2015-10-19 15:21       ` Namhyung Kim
2015-10-20 10:36       ` Wangnan (F)
2015-10-20 13:42         ` Arnaldo Carvalho de Melo
2015-10-20 12:06       ` Wangnan (F)
2015-10-20 13:41         ` Arnaldo Carvalho de Melo
2015-10-14 12:41 ` [PATCH 22/31] perf test: Test BPF prologue Wang Nan
2015-10-14 12:41 ` [PATCH 23/31] bpf tools: Add helper function for updating bpf maps elements Wang Nan
2015-10-14 12:41 ` [PATCH 24/31] bpf tools: Collect map definition in bpf_object Wang Nan
2015-10-14 12:41 ` [PATCH 25/31] bpf tools: Extract and collect map names from BPF object file Wang Nan
2015-10-14 12:41 ` [PATCH 26/31] perf tools: Support perf event alias name Wang Nan
2015-10-21  8:53   ` Namhyung Kim
2015-10-21 13:00     ` Wangnan (F)
2015-10-22  7:16       ` Namhyung Kim
2015-10-22  7:29         ` Wangnan (F)
2015-10-22  7:53           ` Namhyung Kim
2015-10-22  7:59             ` Wangnan (F) [this message]
2015-10-14 12:41 ` [PATCH 27/31] perf tools: Pass available CPU number to clang compiler Wang Nan
2015-10-14 12:41 ` [PATCH 28/31] perf tools: Add API to config maps in bpf object Wang Nan
2015-10-14 12:41 ` [PATCH 29/31] perf tools: Add API to apply config to BPF map Wang Nan
2015-10-14 12:41 ` [PATCH 30/31] perf record: Apply config to BPF objects before recording Wang Nan
2015-10-14 12:41 ` [PATCH 31/31] perf tools: Enable BPF object configure syntax Wang Nan
2015-10-14 15:44 ` [GIT PULL 00/31] perf tools: filtering events using eBPF programs Namhyung Kim

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