linux-kernel - Re: [RFC] perf report: Implement symbol filtering on TUI

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Date:	Fri, 09 Mar 2012 10:53:34 +0900
From:	Namhyung Kim <namhyung.kim@....com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Namhyung Kim <namhyung@...il.com>, Arun Sharma <asharma@...com>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Stephane Eranian <eranian@...gle.com>,
	linux-kernel@...r.kernel.org, dsahern@...il.com, ravitillo@....gov,
	khandual@...ux.vnet.ibm.com, robert.richter@....com,
	ming.m.lin@...el.com, vweaver1@...s.utk.edu, andi@...stfloor.org
Subject: Re: [RFC] perf report: Implement symbol filtering on TUI

Hi,

2012-03-08 7:44 PM, Ingo Molnar wrote:
>
> * Namhyung Kim <namhyung.kim@....com>  wrote:
>
>> Hi, Ingo
>>
>> 2012-03-07 3:07 PM, Ingo Molnar wrote:
>>>
>>> * Namhyung Kim <namhyung.kim@....com>   wrote:
>>>
>>>> As Ingo requested, symbol filtering feature was missing on TUI.
>>>> Add 's' key to get input from user, and do simple filtering by
>>>> strstr(). To turn filtering off, just enter no name by pressing
>>>> 's' followed by ENTER.
>>>>
>>>> There should be many issues, but I just want to release this
>>>> to get some feedbacks.
>>>
>>> I'd love it if in addition to the hotkey, if I typed the obvious
>>> sequence:
>>>
>>>   $ perf report sched
>>>
>>> ... then it would turn into such a filter automagically.
>>>
>>
>> Oh, I implemented that already. Please test it! :)
>
> Cool - I tried it out and it works just as it should!
>
> I noticed two details:
>
>   - "perf report sched | less" does not work as expected - such
>     kinds of features should be GUI-frontend agnostic.
>

Will fix.


>   - unknown symbols are not matched, and thus they will show up
>     indiscrimnately even though I only want to see them if the
>    filter is something like '0x' or 'unknown'.
>

Since they have no symbol. :) In the current implementation, it will
actually show you such symbols if you enter '0x' or 'unknown' as a filter 
unless there're symbols that have those letters in its name.

I can think of 3 solutions for this now:

1. Adding a special filter keyword (like 'unknown'). But there's probably some 
symbols which have those letters.

2. If filter string consists of (hex-) digits only, it will only show hist 
entries doesn't have symbols, or tries to match based on its ip.

3. Implement zooming-in to "unknown" dso. Maybe it's a different issue, but I 
think it's good to have and it'll helps this too.

What do you guys think?


> Anyway, apart from these two details:
>
>   Tested-by: Ingo Molnar <mingo@...e.hu>
>

Thanks for testing and suggestions.
Namhyung


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