linux-kernel - Re: [RFC/PATCH] perf report: Show random usage tip on the help line

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Date:	Wed, 6 Jan 2016 04:19:25 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:	"Wangnan (F)" <wangnan0@...wei.com>,
	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Jiri Olsa <jolsa@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	David Ahern <dsahern@...il.com>,
	Stephane Eranian <eranian@...gle.com>,
	Andi Kleen <andi@...stfloor.org>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Subject: Re: [RFC/PATCH] perf report: Show random usage tip on the help line

Hi Arnaldo,

On Tue, Jan 05, 2016 at 01:40:10PM -0300, Arnaldo Carvalho de Melo wrote:
> Em Tue, Jan 05, 2016 at 07:43:07PM +0900, Namhyung Kim escreveu:
> > Hi,
> > 
> > On Tue, Jan 05, 2016 at 02:32:47PM +0800, Wangnan (F) wrote:
> > > 
> > > 
> > > On 2016/1/5 13:36, Namhyung Kim wrote:
> > > >Currently perf report only shows a help message "For a higher level
> > > >overview, try: perf report --sort comm,dso" unconditionally (even if
> > > >the sort keys were used).  Add more help tips and show randomly.
> > > >
> > > >Signed-off-by: Namhyung Kim <namhyung@...nel.org>
> > > >---
> > > 
> > > That's really funny.
> > 
> > Thanks for your feedback!
> 
> :-)
>  
> > > 
> > > Some inconvenience:
> > > 
> > >  1. Tip is never change during one execution of 'perf report', even if
> > >     I switch to another view using 'enter' and switch back. It should better
> > >     if tips updated when redrawing.
> > 
> > Hmm.. I think it's a preference.  I'd go for simplicity then. :)
> 
> Yeah, that can be easily done on top, after we get some more tips in.

Right.

>  
> > >  2. I think add a "Tip: " prefix to the content should be better, or users
> > > may confuse what he/her doing causes this message
> > 
> > OK.
> > 
> > > 
> > >  3. What about creating a tools/perf/Documentation/tips.txt and generate
> > > tips table dynamically?
> > 
> > I don't see much difference doing that.  I guess most of users don't
> > want to go to see the documentation anyway.  Do I miss something?
> 
> Yes, I think what he suggests is to use:
> 
>   	tips = strlist__new("file://tools/perf/Documentation/tips.txt", NULL);
> 
> And then use:
> 
> 	tip = strlist__entry(tips, random() % strlist__nr_entries(tips));
> 
> 
> Or even do as 'perf trace' does, and have a directory with one file per
> tip, see 005438a8eef0 ("perf trace: Support 'strace' syscall event
> groups")

Thanks for the info.  It's really easy doing that, nice..

I understand what he suggesting, but not why. :)


>  
> > Btw, does anyone have some tips to add? :)
> 
> Lets get the mechanism right and then proof read the tips you provided
> :-)

OK

Thanks,
Namhyung
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