linux-kernel - Re: [PATCH 2/3] perf top: Support call-graph display options also

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Message-ID: <CAM9d7cgeFeJpK-751Fuu0Gvc-gyHKUk9MhurYiaEmMpgozVDyg@mail.gmail.com>
Date:	Thu, 22 Oct 2015 23:34:13 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Taeung Song <treeze.taeung@...il.com>
Cc:	Ingo Molnar <mingo@...nel.org>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Jiri Olsa <jolsa@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	David Ahern <dsahern@...il.com>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Borislav Petkov <bp@...e.de>,
	Chandler Carruth <chandlerc@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Stephane Eranian <eranian@...gle.com>,
	Wang Nan <wangnan0@...wei.com>,
	Brendan Gregg <brendan.d.gregg@...il.com>
Subject: Re: [PATCH 2/3] perf top: Support call-graph display options also

On Thu, Oct 22, 2015 at 10:57 PM, Taeung Song <treeze.taeung@...il.com> wrote:
> Hi, Namhyung and Ingo
>
>> On Oct 22, 2015, at 9:20 PM, Namhyung Kim <namhyung@...nel.org> wrote:
>>
>> On Thu, Oct 22, 2015 at 5:23 PM, Ingo Molnar <mingo@...nel.org> wrote:
>>>
>>> * Namhyung Kim <namhyung@...nel.org> wrote:
>>>
>>>> Currently 'perf top --call-graph' option is same as 'perf record'.  But
>>>> 'perf top' also need to receive display options in 'perf report'.  To do
>>>> that, change parse_callchain_report_opt() to allow record options too.
>>>>
>>>> Now perf top can receive display options like below:
>>>>
>>>>  $ perf top --call-graph
>>>>    Error: option `call-graph' requires a value
>>>>
>>>>   Usage: perf top [<options>]
>>>>
>>>>        --call-graph
>>>>          <mode[,dump_size],output_type,min_percent[,print_limit],call_order[,branch]>
>>>>                     setup and enables call-graph (stack chain/backtrace)
>>>>                     recording: fp dwarf lbr, output_type (graph, flat,
>>>>                   fractal, or none), min percent threshold, optional
>>>>                   print limit, callchain order, key (function or
>>>>                   address), add branches
>>>
>>> Yeah, so this fix is nice, and I think we should also do another patch to fix the
>>> help text output to be the following:
>>>
>>>         --call-graph
>>>           <record_mode[,record_size],print_style,limit[,print_limit],call_order[,sort_key]>
>>>
>>>              Set up and enable call graph (call chain, stack backtrace) recording:
>>>
>>>                 record_mode:   call graph recording mode (fp|dwarf|lbr)
>>>                 record_size:   if rec_mode == dwarf, maximum depth of stack recording (bytes),
>>>                                default: 8192 bytes.
>>>                 print_style:   call graph printing style (graph|flat|fractal|none)
>>>                 limit:         minimum call graph inclusion threshold (percent)
>>>                 print_limit:   printing threshold (percent)
>>>                 call_order:    call graph order (caller|callee)
>>>                 sort_key:      sorting key (function|address|branch)
>>>
>>>               Default: fp,graph,0.5,0.0,caller,function
>>>
>>> Note that this text evolved a bit over what I sent in my previous mail.
>>
>> OK.  I'll cook a patch to improve help message like this as well as man page.
>>
>>
>>>
>>> Also note that I think we should sync up the perf config options to be the same as
>>> the option name shortcuts used in this help text.
>>
>> Ah, good idea.
>>
>>>
>>> Side note: to improve perf config usability, we should probably also recognize
>>> underscores in perf config entries, i.e. the following variants should both work:
>>>
>>>        print_percent = 1
>>>        print-percent = 1
>>>
>>> Right now only the second one will match.
>>
>> Taeung, could you consider fixing this in your config patchiest?
>>
>
> Sure, no problem.
>
> I thought as below.
> Even if one use a print_percent variable, it will be handled like print-percent.
>
> Also if a user change print_percent variable by perf-config command,
> print-percent variable will remain in perfconfig file.
> (Because perf-config command will rewrite perfconfig file.)
>
> Is anything wrong ?

Nop, looks good to me!

Thanks,
Namhyung
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