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

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Message-Id:  <164389947295.382219.17025049915445689710.stgit@wsfd-netdev64.ntdv.lab.eng.bos.redhat.com>
Date:   Thu,  3 Feb 2022 09:44:33 -0500
From:   Eelco Chaudron <echaudro@...hat.com>
To:     peterz@...radead.org, mingo@...hat.com, acme@...nel.org,
        mark.rutland@....com, alexander.shishkin@...ux.intel.com,
        jolsa@...hat.com, namhyung@...nel.org
Cc:     linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] perf scripting python: expose symbol offset and source information

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>
---
 .../util/scripting-engines/trace-event-python.c    |   42 ++++++++++++++------
 1 file changed, 30 insertions(+), 12 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..0f392b4ff663 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 +455,24 @@ 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 +550,6 @@ 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)
 {