linux-kernel - Re: [PATCH v2] perf scripting python: expose symbol offset and source information

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Date:   Sat, 9 Apr 2022 12:42:33 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Eelco Chaudron <echaudro@...hat.com>
Cc:     peterz@...radead.org, mingo@...hat.com, mark.rutland@....com,
        alexander.shishkin@...ux.intel.com, jolsa@...hat.com,
        namhyung@...nel.org, linux-perf-users@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] perf scripting python: expose symbol offset and
 source information

Em Fri, Apr 08, 2022 at 04:18:38PM +0200, Eelco Chaudron escreveu:
> 
> 
> On 22 Feb 2022, at 16:11, Eelco Chaudron wrote:
> 
> > This change adds the symbol offset to the data exported for each
> > call-chain entry. This can not be calculated from the script and
> > only the ip value, and no related mmap information.
> >
> > In addition, also export the source file and line information, if
> > available, to avoid an external lookup if this information is needed.
> >
> > Signed-off-by: Eelco Chaudron <echaudro@...hat.com>
> 
> Hi All, was wondering if this patch got lost?

Applied now to perf/core, heading to 5.19,

- Arnaldo
 
> > ---
> > v2:
> >  - Fixed small code nit
> >  - Included new features in auto generated scripts
> >
> >  .../util/scripting-engines/trace-event-python.c    |   49 +++++++++++++++-----
> >  1 file changed, 36 insertions(+), 13 deletions(-)
> >
> > diff --git a/tools/perf/util/scripting-engines/trace-event-python.c b/tools/perf/util/scripting-engines/trace-event-python.c
> > index e752e1f4a5f0..86a9c8614231 100644
> > --- a/tools/perf/util/scripting-engines/trace-event-python.c
> > +++ b/tools/perf/util/scripting-engines/trace-event-python.c
> > @@ -392,6 +392,18 @@ static const char *get_dsoname(struct map *map)
> >  	return dsoname;
> >  }
> >
> > +static unsigned long get_offset(struct symbol *sym, struct addr_location *al)
> > +{
> > +	unsigned long offset;
> > +
> > +	if (al->addr < sym->end)
> > +		offset = al->addr - sym->start;
> > +	else
> > +		offset = al->addr - al->map->start - sym->start;
> > +
> > +	return offset;
> > +}
> > +
> >  static PyObject *python_process_callchain(struct perf_sample *sample,
> >  					 struct evsel *evsel,
> >  					 struct addr_location *al)
> > @@ -443,6 +455,25 @@ static PyObject *python_process_callchain(struct perf_sample *sample,
> >  					_PyUnicode_FromStringAndSize(node->ms.sym->name,
> >  							node->ms.sym->namelen));
> >  			pydict_set_item_string_decref(pyelem, "sym", pysym);
> > +
> > +			if (node->ms.map) {
> > +				struct map *map = node->ms.map;
> > +				struct addr_location node_al;
> > +				unsigned long offset;
> > +
> > +				node_al.addr = map->map_ip(map, node->ip);
> > +				node_al.map  = map;
> > +				offset = get_offset(node->ms.sym, &node_al);
> > +
> > +				pydict_set_item_string_decref(
> > +					pyelem, "sym_off",
> > +					PyLong_FromUnsignedLongLong(offset));
> > +			}
> > +			if (node->srcline && strcmp(":0", node->srcline)) {
> > +				pydict_set_item_string_decref(
> > +					pyelem, "sym_srcline",
> > +					_PyUnicode_FromString(node->srcline));
> > +			}
> >  		}
> >
> >  		if (node->ms.map) {
> > @@ -520,18 +551,6 @@ static PyObject *python_process_brstack(struct perf_sample *sample,
> >  	return pylist;
> >  }
> >
> > -static unsigned long get_offset(struct symbol *sym, struct addr_location *al)
> > -{
> > -	unsigned long offset;
> > -
> > -	if (al->addr < sym->end)
> > -		offset = al->addr - sym->start;
> > -	else
> > -		offset = al->addr - al->map->start - sym->start;
> > -
> > -	return offset;
> > -}
> > -
> >  static int get_symoff(struct symbol *sym, struct addr_location *al,
> >  		      bool print_off, char *bf, int size)
> >  {
> > @@ -2073,7 +2092,11 @@ static int python_generate_script(struct tep_handle *pevent, const char *outfile
> >
> >  		fprintf(ofp, "\t\tfor node in common_callchain:");
> >  		fprintf(ofp, "\n\t\t\tif 'sym' in node:");
> > -		fprintf(ofp, "\n\t\t\t\tprint(\"\\t[%%x] %%s\" %% (node['ip'], node['sym']['name']))");
> > +		fprintf(ofp, "\n\t\t\t\tprint(\"\t[%%x] %%s%%s%%s%%s\" %% (");
> > +		fprintf(ofp, "\n\t\t\t\t\tnode['ip'], node['sym']['name'],");
> > +		fprintf(ofp, "\n\t\t\t\t\t\"+0x{:x}\".format(node['sym_off']) if 'sym_off' in node else \"\",");
> > +		fprintf(ofp, "\n\t\t\t\t\t\" ({})\".format(node['dso'])  if 'dso' in node else \"\",");
> > +		fprintf(ofp, "\n\t\t\t\t\t\" \" + node['sym_srcline'] if 'sym_srcline' in node else \"\"))");
> >  		fprintf(ofp, "\n\t\t\telse:");
> >  		fprintf(ofp, "\n\t\t\t\tprint(\"\t[%%x]\" %% (node['ip']))\n\n");
> >  		fprintf(ofp, "\t\tprint()\n\n");

-- 

- Arnaldo