linux-kernel - Re: [PATCH v6 01/47] perf map: Improve map/unmap parameter names

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Date: Mon, 18 Dec 2023 22:06:42 -0800
From: Namhyung Kim <namhyung@...nel.org>
To: Ian Rogers <irogers@...gle.com>
Cc: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>, 
	Arnaldo Carvalho de Melo <acme@...nel.org>, Mark Rutland <mark.rutland@....com>, 
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>, Jiri Olsa <jolsa@...nel.org>, 
	Adrian Hunter <adrian.hunter@...el.com>, Nick Terrell <terrelln@...com>, 
	Kan Liang <kan.liang@...ux.intel.com>, Andi Kleen <ak@...ux.intel.com>, 
	Kajol Jain <kjain@...ux.ibm.com>, Athira Rajeev <atrajeev@...ux.vnet.ibm.com>, 
	Huacai Chen <chenhuacai@...nel.org>, Masami Hiramatsu <mhiramat@...nel.org>, 
	Vincent Whitchurch <vincent.whitchurch@...s.com>, "Steinar H. Gunderson" <sesse@...gle.com>, 
	Liam Howlett <liam.howlett@...cle.com>, Miguel Ojeda <ojeda@...nel.org>, 
	Colin Ian King <colin.i.king@...il.com>, Dmitrii Dolgov <9erthalion6@...il.com>, 
	Yang Jihong <yangjihong1@...wei.com>, Ming Wang <wangming01@...ngson.cn>, 
	James Clark <james.clark@....com>, K Prateek Nayak <kprateek.nayak@....com>, 
	Sean Christopherson <seanjc@...gle.com>, Leo Yan <leo.yan@...aro.org>, 
	Ravi Bangoria <ravi.bangoria@....com>, German Gomez <german.gomez@....com>, 
	Changbin Du <changbin.du@...wei.com>, Paolo Bonzini <pbonzini@...hat.com>, Li Dong <lidong@...o.com>, 
	Sandipan Das <sandipan.das@....com>, liuwenyu <liuwenyu7@...wei.com>, 
	linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org, 
	Guilherme Amadio <amadio@...too.org>
Subject: Re: [PATCH v6 01/47] perf map: Improve map/unmap parameter names

On Mon, Dec 11, 2023 at 3:52 PM Ian Rogers <irogers@...gle.com> wrote:
>
> On Mon, Dec 11, 2023 at 3:39 PM Namhyung Kim <namhyung@...nel.org> wrote:
> >
> > On Mon, Dec 11, 2023 at 3:38 PM Namhyung Kim <namhyung@...nel.org> wrote:
> > >
> > > On Wed, Dec 6, 2023 at 5:17 PM Ian Rogers <irogers@...gle.com> wrote:
> > > >
> > > > The u64 values are either absolute or relative, try to hint better in
> > > > the parameter names.
> > > >
> > > > Suggested-by: Namhyung Kim <namhyung@...nel.org>
> > > > Signed-off-by: Ian Rogers <irogers@...gle.com>
> > > > ---
> > > >  tools/perf/util/map.h | 16 ++++++++--------
> > > >  1 file changed, 8 insertions(+), 8 deletions(-)
> > > >
> > > > diff --git a/tools/perf/util/map.h b/tools/perf/util/map.h
> > > > index 3a3b7757da5f..49756716cb13 100644
> > > > --- a/tools/perf/util/map.h
> > > > +++ b/tools/perf/util/map.h
> > > > @@ -105,25 +105,25 @@ static inline u64 map__dso_map_ip(const struct map *map, u64 ip)
> > > >  }
> > > >
> > > >  /* dso rip -> ip */
> > > > -static inline u64 map__dso_unmap_ip(const struct map *map, u64 ip)
> > > > +static inline u64 map__dso_unmap_ip(const struct map *map, u64 rip)
> > > >  {
> > > > -       return ip + map__start(map) - map__pgoff(map);
> > > > +       return rip + map__start(map) - map__pgoff(map);
> > > >  }
> > > >
> > > > -static inline u64 map__map_ip(const struct map *map, u64 ip)
> > > > +static inline u64 map__map_ip(const struct map *map, u64 ip_or_rip)
> > >
> > > I'm afraid it's gonna be more confusing.  Can we say just 'rip'?
> >
> > Oh.. I think it should be 'ip'.
>
> But sometimes it is an ip and sometimes it is an rip, hence the long
> name. I don't think this really affects much so I'd prefer to stick
> with the intention revealing name if possible.

I don't think the intention is to mix ip and rip.

Does it really pass (already mapped) rip to the map function
again?  I know rip and ip can be identical but it doesn't mean
it can use rip to the map function.

Thanks,
Namhyung