linux-kernel - Re: RFC Re: [PATCH v2 04/13] perf tools: Add API to config maps in bpf object

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Message-ID: <56590194.7030406@huawei.com>
Date:	Sat, 28 Nov 2015 09:21:24 +0800
From:	"Wangnan (F)" <wangnan0@...wei.com>
To:	Arnaldo Carvalho de Melo <acme@...nel.org>
CC:	Alexei Starovoitov <ast@...nel.org>,
	<linux-kernel@...r.kernel.org>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Peter Zijlstra <peterz@...radead.org>,
	David Ahern <dsahern@...il.com>,
	Ingo Molnar <mingo@...nel.org>, Jiri Olsa <jolsa@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Brendan Gregg <brendan.d.gregg@...il.com>,
	<lizefan@...wei.com>, <pi3orama@....com>,
	He Kuang <hekuang@...wei.com>
Subject: Re: RFC Re: [PATCH v2 04/13] perf tools: Add API to config maps in
 bpf object



On 2015/11/28 9:20, Wangnan (F) wrote:
>
>
> On 2015/11/28 9:10, Arnaldo Carvalho de Melo wrote:
>> Em Fri, Nov 27, 2015 at 08:47:38AM +0000, Wang Nan escreveu:
>>> bpf__config_obj() is introduced as a core API to config BPF object
>>> after loading. One configuration option of maps is introduced. After
>>> this patch BPF object can accept configuration like:
>>>
>>>   maps:my_map:value=1234
>>>
>>> (maps.my_map.value looks pretty. However, there's a small but hard
>>> to fixed problem related to flex's greedy matching. Please see [1].
>>> Choose ':' to avoid it in a simpler way.)
>> Understood the issues, but I would like to hear from Ingo, Jiri,
>> Namhyung, Brian and others here, since we're setting up syntax, and yes,
>> using:
>>       maps.my_map.value[0,3...6]=1234;
>>
>> or even:
>>
>>    maps->my_map->value[0,3...6]=1234;
>>
>> Looks more natural than:
>>
>>    maps:my_map:value[0,3...6]=1234;
>
> You don't mention maps::my_map::value. C++ use '::' this way, so I think
> it is also a possible choice.
>
> Or we can use another character for example '|' to replace '/' in case we
> have a map starting with 'c' or 'o'. For example:
>
> ./mybpf.c|maps.channel.value=1234|
>
> and in normal case still support '/':
>
> ./mybpf.c/maps.channel.value=1234/

Should be:

./mybpf.c/maps.mymap.value=1234/

>
> like 'sed':
>
> # sed 's/a/b/g'
> a
> b
> # sed 's+/+|+g'
> /
> |
>
> Thank you.


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