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

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Message-ID: <87wqslfzk4.fsf@sejong.aot.lge.com>
Date:	Tue, 02 Apr 2013 11:15:23 +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

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?

And it seems that addr in branch info is original ip, Stephane?

Thanks,
Namhyung
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