linux-kernel - Re: [PATCH 03/11] perf tools: Do not change lib/api/fs/debugfs directly

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Date:	Wed, 26 Aug 2015 11:27:58 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	Raphaël Beamonte <raphael.beamonte@...il.com>
Cc:	Jiri Olsa <jolsa@...nel.org>, Namhyung Kim <namhyung@...nel.org>,
	Matt Fleming <matt@...eblueprint.co.uk>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...nel.org>,
	David Ahern <dsahern@...il.com>,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 03/11] perf tools: Do not change lib/api/fs/debugfs
 directly

Em Wed, Aug 26, 2015 at 10:06:45AM -0400, Raphaël Beamonte escreveu:
> On Aug 26, 2015 9:47 AM, "Jiri Olsa" <jolsa@...nel.org> wrote:
> >
> > The tracing_events_path is the variable we want to change
> > via --debugfs-dir option, not the debugfs_mountpoint.
> 
> <SNIP>
> 
> >                         perf_debugfs_set_path(cmd +
> strlen(CMD_DEBUGFS_DIR));
> > -                       fprintf(stderr, "dir: %s\n", debugfs_mountpoint);
> > +                       fprintf(stderr, "dir: %s\n", tracing_path);
> >                         if (envchanged)
> >                                 *envchanged = 1;
> >                 } else if (!strcmp(cmd, "--list-cmds")) {
> > diff --git a/tools/perf/util/util.c b/tools/perf/util/util.c
> > index d33c34196a5a..7acafb3c5592 100644
> > --- a/tools/perf/util/util.c
> > +++ b/tools/perf/util/util.c
> > @@ -439,7 +439,6 @@ const char *perf_debugfs_mount(const char *mountpoint)
> >
> >  void perf_debugfs_set_path(const char *mntpt)
> >  {
> > -       snprintf(debugfs_mountpoint, strlen(debugfs_mountpoint), "%s",
> mntpt);
> >         set_tracing_events_path("tracing/", mntpt) ;
> >  }
> 
> Why keep a function name with debugfs in it here if we're not touching
> debugfs anymore?

Right

> Shouldn't we call directly set_tracing_events_path if that's what we
> want to do? Also, the option name --debugfs-dir is not entirely
> relevant anymore?

Yeah, probably that was a really bad name to start with, i.e. it
should've been named perhaps --event-definitions-dir or something to
that degree.

"debugfs", "tracefs" and the next thing to come in this area are just
implementation details :-)

- Arnaldo
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