linux-kernel - Re: [PATCH 6/9] perf sort: Add 'addr' sort key

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Message-ID: <87txnodlny.fsf@sejong.aot.lge.com>
Date:	Wed, 03 Apr 2013 18:10:41 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Jiri Olsa <jolsa@...hat.com>
Cc:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...nel.org>,
	Namhyung Kim <namhyung.kim@....com>,
	LKML <linux-kernel@...r.kernel.org>,
	Stephane Eranian <eranian@...gle.com>,
	Andi Kleen <andi@...stfloor.org>,
	David Ahern <dsahern@...il.com>
Subject: Re: [PATCH 6/9] perf sort: Add 'addr' sort key

Hi Jiri,

On Tue, 2 Apr 2013 10:40:14 +0200, Jiri Olsa wrote:
> On Tue, Apr 02, 2013 at 11:15:23AM +0900, Namhyung Kim wrote:
>> On Mon, 1 Apr 2013 22:40:23 +0200, Jiri Olsa wrote:
>> > On Mon, Apr 01, 2013 at 08:35:22PM +0900, Namhyung Kim wrote:
>> >> From: Namhyung Kim <namhyung.kim@....com>
>> >> 
>> >> New addr sort key provides a way to sort the entries by the symbol
>> >> addresses.  It can be helpful to figure out symbol resolution problem
>> >> when a dso cannot do it properly as well as finding hotpath in a dso
>> >> and/or a function.
>> >
>> > maybe it's just the recent mem profiling patches, but wouldn't
>> > it be better to use 'ip' instead of 'addr'?
>> >
>> > also it's following code getting the data:
>> > ...
>> >         if (sample_type & PERF_SAMPLE_IP)
>> >                 data->ip = perf_instruction_pointer(regs);
>> > ...
>> >
>> > same for the "perf sort: Add 'addr_to/from' sort key" patch
>> 
>> I'm not sure I understand what you mean exactly.
>> 
>> I used hist_entry->ip but it was set by al->addr which was converted
>> from the original sample ip to a relative ip by map->map_ip().
>> 
>> I can change it to use ->unmap_ip() before printing.  Is that your
>> concern?
>
> what I meant was the 'addr' name itself for -s option, like use:
>   '-s ip' instead of '-s addr'

Well, I don't know what's better.  But the 'addr' looks more natural to
me and it's requested originally.  And the 'ip' can have multiple
meaning. :)

Thanks,
Namhyung

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