linux-kernel - Re: [PATCH 5/5 v2] perf timechart: add emphasize option

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Message-ID: <20131217142628.GA7643@gmail.com>
Date:	Tue, 17 Dec 2013 15:26:28 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
Cc:	Stanislav Fomichev <stfomichev@...dex-team.ru>,
	linux-kernel@...r.kernel.org, a.p.zijlstra@...llo.nl,
	paulus@...ba.org, mingo@...hat.com, namhyung@...nel.org,
	artagnon@...il.com, jolsa@...hat.com
Subject: Re: [PATCH 5/5 v2] perf timechart: add emphasize option


* Arnaldo Carvalho de Melo <acme@...stprotocols.net> wrote:

> Em Tue, Dec 17, 2013 at 03:06:08PM +0100, Ingo Molnar escreveu:
> > * Arnaldo Carvalho de Melo <acme@...stprotocols.net> wrote:
> > > Em Tue, Dec 17, 2013 at 02:41:37PM +0100, Ingo Molnar escreveu:
> > > > * Arnaldo Carvalho de Melo <acme@...stprotocols.net> wrote:
> > > > > Em Tue, Dec 17, 2013 at 04:15:22PM +0400, Stanislav Fomichev escreveu:
> > > > > > > Please give a sample usage command line and a sample output. (the 
> > > > > > > highlighting can be done using ASCII escape sequences in the changelog 
> > > > > > > as well.)
> > > > > > Highlighting is done in the generated SVG, so I can't really show it in
> > > > > > the log or documentation. But I added simple example with -e option.
> 
> > > > > > >   -e::
> > > > > > >   --emphasize=<duration_nsecs|task_name>::
> > > > > > Thanks, added.
> 
> > > > > I also wonder how to allocate single letter options here... can we live
> > > > > with just --emphasize for now? Wouldn't at some point we maybe want to
> > > > > use -e in 'perf timechart' to pick some specific event, and then, to
> > > > > make it consistent with the other tools, -e would then be used?
> 
> > > > I wanted to raise a similar argument too - so if we don't have to do 
> > > > -e then maybe '--grep' would be the better option name?
> 
> > > > If it becomes popular then the pattern matching can be improved, 
> > > > without having to change the option name and such.
> 
> > > Humm, 'grep' is a filter, i.e. something that removes parts of the 
> > > data being perused, while this case it will not filter anything, it 
> > > will just make something that matches some search criteria to stand 
> > > out from the rest, that is still there, so perhaps --emphasize is Ok 
> > > albeit kinda long...
> > 
> > So I frequently use grep with -C 1000 --color=always to also show the 
> > context. But --grep-context sounds too long.
> 
> Just tried it here, and on fedora 18 one doesn't even needs the
> --color=always [...]

That's only needed if you look at it through 'less' and such. (at 
which point 'less -R' is your friend.)

> > > Do we have any other command line tool that has a long standing 
> > > semantics of "highlighting" or "emphasizing" parts of a data 
> > > stream?
> > 
> > Yeah, grep's -C, -A, -B options. (--context, --context-after, 
> > --context-before), combined with the --color option to highlight.
> 
> I don't feel like there is a direct mapping of what he wants to 
> achieve to reusing the 'grep' keyword, at least it didn't sound 
> natural at first sight to me. :-)

Yeah, agreed.

Thanks,

	Ingo
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