linux-kernel - Re: RFP: Fixing "-ga -ag -g fp -g dwarf" was Re: [PATCHSET 0/8] perf tools: Fix scalability problem on callchain merging (v5)

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Date:	Sat, 26 Oct 2013 14:03:36 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
Cc:	David Ahern <dsahern@...il.com>, Jiri Olsa <jolsa@...hat.com>,
	Namhyung Kim <namhyung@...nel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Namhyung Kim <namhyung.kim@....com>,
	LKML <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Frederic Weisbecker <fweisbec@...il.com>
Subject: Re: RFP: Fixing "-ga -ag -g fp -g dwarf" was Re: [PATCHSET 0/8] perf
 tools: Fix scalability problem on callchain merging (v5)


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

> Em Fri, Oct 25, 2013 at 01:22:27PM -0600, David Ahern escreveu:
> > On 10/25/13 1:09 PM, Arnaldo Carvalho de Melo wrote:
> > >>>I think I did with the second follow up patch: -ga -ag -g fp -g
> > >>>dwarf should all work properly with fp the default for -g.
> 
> > >>Acked-by: Ingo Molnar <mingo@...nel.org>
> 
> > >Can I have this one submitted?
>  
> > Upon further review, Jiri was correct: that patch handles some of
> > the old cases fine, but did not handle others. ie., it just moved
> > the bad syntax problem around.
> 
> perhaps we can do, at least for now, with what Ingo suggested?
> 
> Namely, having:
> 
> --call-graph   Require an argument, either "dwarf" or "fp"
> -g             Doesn't require anything, uses whatever is configured,
>                fp if no explicit config is done in places like
>                ~/.perfconfig
> 
> Fits with what most people do usually, no?

Please do this! Usability sucks right now, going from '-g' to
'-g <foo>' was an incompatible change, a regression I argue,
which should be fixed in an urgent branch ASAP.

Thanks,

	Ingo
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