linux-kernel - Re: [PATCH 1/3] perf help: Document missing options

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Date:   Tue, 14 Nov 2017 10:03:02 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Taeung Song <treeze.taeung@...il.com>
Cc:     Namhyung Kim <namhyung@...nel.org>,
        Sihyeon Jang <uneedsihyeon@...il.com>,
        linux-kernel@...r.kernel.org, Jiri Olsa <jolsa@...nel.org>,
        kernel-team@....com
Subject: Re: [PATCH 1/3] perf help: Document missing options

Em Tue, Nov 14, 2017 at 11:18:10AM +0900, Taeung Song escreveu:
> Hi Arnaldo and Namhyung :)
> 
> On 11/14/2017 09:15 AM, Namhyung Kim wrote:
> > Hi Arnaldo,
> > 
> > On Mon, Nov 13, 2017 at 03:29:56PM -0300, Arnaldo Carvalho de Melo wrote:
> > > Em Sun, Nov 12, 2017 at 10:10:45AM +0900, Sihyeon Jang escreveu:
> > > > Cc: Jiri Olsa <jolsa@...nel.org>
> > > > Cc: Namhyung Kim <namhyung@...nel.org>
> > > > Signed-off-by: Sihyeon Jang <uneedsihyeon@...il.com>
> > > > ---
> > > >   tools/perf/Documentation/perf-help.txt | 14 +++++++++++++-
> > > >   1 file changed, 13 insertions(+), 1 deletion(-)
> > > > 
> > > > diff --git a/tools/perf/Documentation/perf-help.txt b/tools/perf/Documentation/perf-help.txt
> > > > index 5143918..bb605af 100644
> > > > --- a/tools/perf/Documentation/perf-help.txt
> > > > +++ b/tools/perf/Documentation/perf-help.txt
> > > > @@ -7,7 +7,7 @@ perf-help - display help information about perf
> > > >   SYNOPSIS
> > > >   --------
> > > > -'perf help' [-a|--all] [COMMAND]
> > > > +'perf help' [--all] [--man|--web|--info] [COMMAND]
> > > 
> > > Can you try figuring out if this actually works? I tried here and it
> > > doesn't, its an area we took "for free" when we copied the initial
> > > codebase from git.git, but I never looked at this area that much, now
> > > that I try:
> > 
> > Yeah, I'm not sure we need to keep it.
> > 
> > 
> > > 
> > > [acme@...et linux]$ perf help
> > > Config with no key for man viewer: childrenError: wrong config key-value pair top.children=true
> > > [acme@...et linux]$
> > > 
> > > Unsure if this is something that got broken by the 'perf config'
> > > patches, Taeung?
> > 
> > Looks like a bug in 8e99b6d4533c ("tools include: Adopt strstarts()
> > from the kernel").
> > 
> > Following patch should fix it:
> > 
> > Thanks,
> > Namhyung
> 
> I also checked this error and test the below patch.
> It seems that Namhyung already fixes it !!

Thanks for checking, added a Tested-by: Taeung,

- Arnaldo
 
> Thanks,
> Taeung
> 
> > 
> > 
> >  From 096b78b437b5758acc025498e88d73d9d471b3c0 Mon Sep 17 00:00:00 2001
> > From: Namhyung Kim <namhyung@...nel.org>
> > Date: Tue, 14 Nov 2017 09:10:43 +0900
> > Subject: [PATCH] perf help: Fix a bug during strstart() conversion
> > 
> > The commit 8e99b6d4533c changed prefixcmp() to strstart() but missed to
> > change the return value in some place.  It makes perf help print
> > annoying output even for sane config items like below:
> > 
> >    $ perf help
> >    '.root': unsupported man viewer sub key.
> >    ...
> > 
> > Fixes: 8e99b6d4533c ("tools include: Adopt strstarts() from the kernel")
> > Cc: Taeung Song <treeze.taeung@...il.com>
> > Signed-off-by: Namhyung Kim <namhyung@...nel.org>
> > ---
> >   tools/perf/builtin-help.c | 4 ++--
> >   1 file changed, 2 insertions(+), 2 deletions(-)
> > 
> > diff --git a/tools/perf/builtin-help.c b/tools/perf/builtin-help.c
> > index dbe4e4153bcf..ff51e5fc0daf 100644
> > --- a/tools/perf/builtin-help.c
> > +++ b/tools/perf/builtin-help.c
> > @@ -283,7 +283,7 @@ static int perf_help_config(const char *var, const char *value, void *cb)
> >   		add_man_viewer(value);
> >   		return 0;
> >   	}
> > -	if (!strstarts(var, "man."))
> > +	if (strstarts(var, "man."))
> >   		return add_man_viewer_info(var, value);
> >   	return 0;
> > @@ -313,7 +313,7 @@ static const char *cmd_to_page(const char *perf_cmd)
> >   	if (!perf_cmd)
> >   		return "perf";
> > -	else if (!strstarts(perf_cmd, "perf"))
> > +	else if (strstarts(perf_cmd, "perf"))
> >   		return perf_cmd;
> >   	return asprintf(&s, "perf-%s", perf_cmd) < 0 ? NULL : s;
> >