linux-kernel - Re: [PATCH 08/14] perf tools: Use kmod_path__parse in map_groups__set_modules_path

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Date:	Mon, 23 Mar 2015 08:55:09 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Arnaldo Carvalho de Melo <acme@...hat.com>
Cc:	Jiri Olsa <jolsa@...nel.org>, linux-kernel@...r.kernel.org,
	Adrian Hunter <adrian.hunter@...el.com>,
	Corey Ashford <cjashfor@...ux.vnet.ibm.com>,
	David Ahern <dsahern@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...nel.org>,
	Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Stephane Eranian <eranian@...gle.com>, acme@...nel.org
Subject: Re: [PATCH 08/14] perf tools: Use kmod_path__parse in
 map_groups__set_modules_path_dir

Hi Arnaldo,

On Sat, Mar 21, 2015 at 03:20:43PM -0300, Arnaldo Carvalho de Melo wrote:
> Em Fri, Mar 06, 2015 at 12:13:56PM +0100, Jiri Olsa escreveu:
> > Replacing the file name parsing with kmod_path__parse
> > and moving the dso update into new separate function.
> > 
> > ---
> >  tools/perf/util/machine.c | 65 ++++++++++++++++++++++++++++++-----------------
> >  1 file changed, 41 insertions(+), 24 deletions(-)
> > 
> > diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c
> 
> > +static int map_groups__set_module_path(struct map_groups *mg, const char *path,
> > +				       struct kmod_path *m)
> > +{
> > +	struct map *map;
> > +	char *long_name;
> > +
> > +	map = map_groups__find_by_name(mg, MAP__FUNCTION, m->name);
> > +	if (map == NULL)
> > +		return 0;
> > +
> > +	long_name = strdup(path);
> > +	if (long_name == NULL)
> > +		return -ENOMEM;
> > +
> > +	dso__set_long_name(map->dso, long_name, true);
> > +	dso__kernel_module_get_build_id(map->dso, "");
> > +
> > +	/*
> > +	 * Full name could reveal us kmod compression, so
> > +	 * we need to update the symtab_type if needed.
> > +	 */
> > +	if (m->comp && is_kmod_dso(map->dso))
> > +		map->dso->symtab_type++;
> 
> Ouch, does this assumes this is a:
> 
> DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE

Nope, it's one of _SYSTEM_PATH_KMODULE or _GUEST_KMODULE.


> 
> And that, because in the dso_binary_type enum
> DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP comes right after it, and thus
> this cryptic increment is equivalent to:
> 
> 		map->dso->symtab_type = DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP;

Again, _SYSTEM_PATH_KMODULE_COMP or _GUEST_KMODULE_COMP.

Thanks,
Namhyung


> 
> ?
> 
> Also, this part:
> 
> ----
>     Replacing the file name parsing with kmod_path__parse and moving the
> dso update into new separate function.
> ----
> 
> Indicates that this probably would be best done in two separate patches,
> one that introduces the new function, but is equivalent to the existing
> code, and the next one adding the new logic?
> 
> Processed all the patches up to this one, stopping now ;-)
> 
> - Arnaldo
> --
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