linux-kernel - Re: [PATCH v2 1/2] perf tools: Add kallsyms__get_symbol

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Message-ID: <ZMFzWcKUn2M2j9lF@kernel.org>
Date:   Wed, 26 Jul 2023 16:26:17 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Adrian Hunter <adrian.hunter@...el.com>
Cc:     Namhyung Kim <namhyung@...nel.org>, Jiri Olsa <jolsa@...nel.org>,
        Ian Rogers <irogers@...gle.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-perf-users@...r.kernel.org
Subject: Re: [PATCH v2 1/2] perf tools: Add kallsyms__get_symbol_start()

Em Tue, Jul 25, 2023 at 05:07:40PM +0300, Adrian Hunter escreveu:
> On 25/07/23 03:19, Namhyung Kim wrote:
> > The kallsyms__get_symbol_start() to get any symbol address from
> > kallsyms.  The existing kallsyms__get_function_start() only allows text
> > symbols so create this to allow data symbols too.
> > 
> > Acked-by: Ian Rogers <irogers@...gle.com>
> > Signed-off-by: Namhyung Kim <namhyung@...nel.org>
> 
> Acked-by: Adrian Hunter <adrian.hunter@...el.com>

Thanks, applied both patches.

- Arnaldo
 
> > ---
> >  tools/perf/util/event.c | 30 +++++++++++++++++++++++++++---
> >  tools/perf/util/event.h |  2 ++
> >  2 files changed, 29 insertions(+), 3 deletions(-)
> > 
> > diff --git a/tools/perf/util/event.c b/tools/perf/util/event.c
> > index 4cbb092e0684..923c0fb15122 100644
> > --- a/tools/perf/util/event.c
> > +++ b/tools/perf/util/event.c
> > @@ -93,8 +93,8 @@ struct process_symbol_args {
> >  	u64	   start;
> >  };
> >  
> > -static int find_symbol_cb(void *arg, const char *name, char type,
> > -			  u64 start)
> > +static int find_func_symbol_cb(void *arg, const char *name, char type,
> > +			       u64 start)
> >  {
> >  	struct process_symbol_args *args = arg;
> >  
> > @@ -110,12 +110,36 @@ static int find_symbol_cb(void *arg, const char *name, char type,
> >  	return 1;
> >  }
> >  
> > +static int find_any_symbol_cb(void *arg, const char *name,
> > +			      char type __maybe_unused, u64 start)
> > +{
> > +	struct process_symbol_args *args = arg;
> > +
> > +	if (strcmp(name, args->name))
> > +		return 0;
> > +
> > +	args->start = start;
> > +	return 1;
> > +}
> > +
> >  int kallsyms__get_function_start(const char *kallsyms_filename,
> >  				 const char *symbol_name, u64 *addr)
> >  {
> >  	struct process_symbol_args args = { .name = symbol_name, };
> >  
> > -	if (kallsyms__parse(kallsyms_filename, &args, find_symbol_cb) <= 0)
> > +	if (kallsyms__parse(kallsyms_filename, &args, find_func_symbol_cb) <= 0)
> > +		return -1;
> > +
> > +	*addr = args.start;
> > +	return 0;
> > +}
> > +
> > +int kallsyms__get_symbol_start(const char *kallsyms_filename,
> > +			       const char *symbol_name, u64 *addr)
> > +{
> > +	struct process_symbol_args args = { .name = symbol_name, };
> > +
> > +	if (kallsyms__parse(kallsyms_filename, &args, find_any_symbol_cb) <= 0)
> >  		return -1;
> >  
> >  	*addr = args.start;
> > diff --git a/tools/perf/util/event.h b/tools/perf/util/event.h
> > index de20e01c9d72..d8bcee2e9b93 100644
> > --- a/tools/perf/util/event.h
> > +++ b/tools/perf/util/event.h
> > @@ -360,6 +360,8 @@ size_t perf_event__fprintf(union perf_event *event, struct machine *machine, FIL
> >  
> >  int kallsyms__get_function_start(const char *kallsyms_filename,
> >  				 const char *symbol_name, u64 *addr);
> > +int kallsyms__get_symbol_start(const char *kallsyms_filename,
> > +			       const char *symbol_name, u64 *addr);
> >  
> >  void event_attr_init(struct perf_event_attr *attr);
> >  
> 

-- 

- Arnaldo