linux-kernel - Re: [PATCH] perf-probe: make "perf-probe -L <function>" display the absolute path and absolute line number

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Message-ID: <m34o9c8ual.fsf@gmail.com>
Date:	Thu, 13 Jan 2011 20:42:26 +0100
From:	Franck Bui-Huu <vagabon.xyz@...il.com>
To:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	lkml <linux-kernel@...r.kernel.org>,
	2nddept-manager@....hitachi.co.jp
Subject: Re: [PATCH] perf-probe: make "perf-probe -L <function>" display the absolute path and absolute line number

Masami Hiramatsu <masami.hiramatsu.pt@...achi.com> writes:

> (2011/01/13 19:20), Franck Bui-Huu wrote:
>> From: Franck Bui-Huu <fbuihuu@...il.com>
>> 
>> It should be more usefull to get the full location of the function
>
>> (absolute line number + full path) instead of repeating the name of
>> the function and the start line number given by the command line.
>> 
>> So we had before:
>> 
>>    $ perf probe -L schedule | head -n3
>>    <schedule:0>
>>          0  asmlinkage void __sched schedule(void)
>>          1  {
>> 
>> and now we get:
>> 
>>    $ perf probe -L schedule | head -n3
>>    </usr/src/debug/kernel-2.6.35.fc14/linux-2.6.35.x86_64/kernel/sched.c:3813>
>>          0  asmlinkage void __sched schedule(void)
>>          1  {
>
> Indeed, it could be useful for users to see where the function is...
>
> However, I think that should be optional, because the output lines
> have the relative line numbers from the function, and those numbers
> are important for users who want to probe a specific line by using
> function relative line numbers. e.g. "schedule:10"
>
> And with that option, I'd suggest to show absolute line numbers on each line.
>
>   $ perf probe -L schedule:0-1 --by-source
>   </usr/src/debug/kernel-2.6.35.fc14/linux-2.6.35.x86_64/kernel/sched.c:3813>
>      3813  asmlinkage void __sched schedule(void)
>      3814  {
>
> Or, just show source file as an additional information.
>
>   $ perf probe -L schedule:0-1
>   <schedule@...r/src/debug/kernel-2.6.35.fc14/linux-2.6.35.x86_64/kernel/sched.c:0>
>         0  asmlinkage void __sched schedule(void)
>         1  {
>
> I just would like to keep the consistency of the output/input format.

Well, for consistency, I thought that the additional information (given
inside angle brackets) should always be the same: a full path and an
absolute line number which clearly identify which source file perf-probe
is listing.

-- 
		Franck
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