linux-kernel - Re: [PATCH 07/10] perf script: Move printing of 'common' data from print

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Message-ID: <4D78174B.2090209@cisco.com>
Date:	Wed, 09 Mar 2011 17:11:55 -0700
From:	David Ahern <daahern@...co.com>
To:	Frederic Weisbecker <fweisbec@...il.com>
CC:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: Re: [PATCH 07/10] perf script: Move printing of 'common' data from
 print_event and rename



On 03/09/11 17:10, Frederic Weisbecker wrote:
> On Wed, Mar 09, 2011 at 05:04:31PM -0700, David Ahern wrote:
>>
>>
>> On 03/09/11 16:50, Frederic Weisbecker wrote:
>>
>>>> +++ b/tools/perf/util/trace-event-parse.c
>>>> @@ -2648,63 +2648,8 @@ static void print_lat_fmt(void *data, int size __unused)
>>>>  		printf("%d", lock_depth);
>>>>  }
>>>>  
>>>> -/* taken from Linux, written by Frederic Weisbecker */
>>>> -static void print_graph_cpu(int cpu)
>>>> -{
>>>> -	int i;
>>>> -	int log10_this = log10_cpu(cpu);
>>>> -	int log10_all = log10_cpu(cpus);
>>>> -
>>>> -
>>>> -	/*
>>>> -	 * Start with a space character - to make it stand out
>>>> -	 * to the right a bit when trace output is pasted into
>>>> -	 * email:
>>>> -	 */
>>>> -	printf(" ");
>>>> -
>>>> -	/*
>>>> -	 * Tricky - we space the CPU field according to the max
>>>> -	 * number of online CPUs. On a 2-cpu system it would take
>>>> -	 * a maximum of 1 digit - on a 128 cpu system it would
>>>> -	 * take up to 3 digits:
>>>> -	 */
>>>> -	for (i = 0; i < log10_all - log10_this; i++)
>>>> -		printf(" ");
>>>> -
>>>> -	printf("%d) ", cpu);
>>>> -}
>>>
>>> So, we indeed don't use the function graph tracer with perf yet.
>>> But there are fair chances we will in the future.
>>>
>>> So if we remove such code, I would prefer this to be made as
>>> a seperate commit. Something we can easily retrieve and revert
>>> in the future.
>>
>> Once the references to the functions are removed, compile fails --
>> functions defined without a user.
>>
>> I left the cpu arg into print_trace_event to avoid having to delete even
>> more code because of that.
> 
> And if you actually keep those functions in place?

Compile fails.
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