linux-kernel - Re: [PATCHSET 00/17] perf report: Add -F option for specifying output fields (v4)

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Message-ID: <87lhuwr2pk.fsf@sejong.aot.lge.com>
Date:	Wed, 23 Apr 2014 15:15:35 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Don Zickus <dzickus@...hat.com>
Cc:	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Jiri Olsa <jolsa@...hat.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...nel.org>,
	Paul Mackerras <paulus@...ba.org>,
	Namhyung Kim <namhyung.kim@....com>,
	LKML <linux-kernel@...r.kernel.org>,
	David Ahern <dsahern@...il.com>,
	Andi Kleen <andi@...stfloor.org>
Subject: Re: [PATCHSET 00/17] perf report: Add -F option for specifying output fields (v4)

Hi Don,

On Tue, 22 Apr 2014 17:16:47 -0400, Don Zickus wrote:
> On Wed, Apr 16, 2014 at 12:05:37PM +0900, Namhyung Kim wrote:
>> Hello,
>> 
>> This is a patchset implementing -F/--fields option to setup output
>> field/column as Ingo requested.  It depends on my --percentage
>> patchset [1].
>> 
>> The -F option can receive any sort keys that -s option recognize, plus
>> following fields (name can be changed):
>> 
>>   overhead, overhead_sys, overhead_us, sample, period
>> 
>> The overhead_guest_sys and overhead_guest_us might be avaiable when
>> you profile guest machines.
>> 
>> Output will be sorted by in order of fields and sort keys passed by -s
>> option will be added to the output field list automatically.  If you
>> want to change the order of sorting you can give -s option in addition
>> to -F option.  To support old behavior, it'll also prepend 'overhead'
>> field to the sort keys unless you give -F option explicitly.
>
> So I am struggling a little bit to get this working correctly.  I had it
> in my head that I could sort internally with -s and re-sort the output
> based on -F, but it doesn't seem to be working that way.

Hmm.. probably it's me miss something on perf mem side..  I don't have
an access to a machine to test it now.

>
> For example with
>
> ./perf mem record -a grep -r foo /* > /dev/null
> ./perf mem report -F overhead,symbol_daddr,pid -s symbol_daddr,pid --stdio 
>
> I was thinking I could sort everything based on the symbol_daddr and pid.
> Then re-sort the output to display the highest 'symbol_daddr,pid' pair.
> But it didn't seem to work that way.  Instead it seems like I get the
> original sort just displayed in the -F format.

Could you please show me the output of your example?

Thanks,
Namhyung
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