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-rw-r--r--tools/perf/util/symbol.c116
1 files changed, 84 insertions, 32 deletions
diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
index 8e6627e6b77..381999dd5c1 100644
--- a/tools/perf/util/symbol.c
+++ b/tools/perf/util/symbol.c
@@ -161,7 +161,7 @@ static size_t symbol__fprintf(struct symbol *self, FILE *fp)
self->start, self->end, self->name);
}
-static void dso__set_long_name(struct dso *self, char *name)
+void dso__set_long_name(struct dso *self, char *name)
{
if (name == NULL)
return;
@@ -176,7 +176,7 @@ static void dso__set_basename(struct dso *self)
struct dso *dso__new(const char *name)
{
- struct dso *self = malloc(sizeof(*self) + strlen(name) + 1);
+ struct dso *self = zalloc(sizeof(*self) + strlen(name) + 1);
if (self != NULL) {
int i;
@@ -500,13 +500,17 @@ static int dso__split_kallsyms(struct dso *self, struct map *map,
*module++ = '\0';
- if (strcmp(self->name, module)) {
+ if (strcmp(curr_map->dso->short_name, module)) {
curr_map = map_groups__find_by_name(&session->kmaps, map->type, module);
if (curr_map == NULL) {
pr_debug("/proc/{kallsyms,modules} "
- "inconsistency!\n");
+ "inconsistency while looking "
+ "for \"%s\" module!\n", module);
return -1;
}
+
+ if (curr_map->dso->loaded)
+ goto discard_symbol;
}
/*
* So that we look just like we get from .ko files,
@@ -1343,13 +1347,33 @@ struct map *map_groups__find_by_name(struct map_groups *self,
for (nd = rb_first(&self->maps[type]); nd; nd = rb_next(nd)) {
struct map *map = rb_entry(nd, struct map, rb_node);
- if (map->dso && strcmp(map->dso->name, name) == 0)
+ if (map->dso && strcmp(map->dso->short_name, name) == 0)
return map;
}
return NULL;
}
+static int dso__kernel_module_get_build_id(struct dso *self)
+{
+ char filename[PATH_MAX];
+ /*
+ * kernel module short names are of the form "[module]" and
+ * we need just "module" here.
+ */
+ const char *name = self->short_name + 1;
+
+ snprintf(filename, sizeof(filename),
+ "/sys/module/%.*s/notes/.note.gnu.build-id",
+ (int)strlen(name - 1), name);
+
+ if (sysfs__read_build_id(filename, self->build_id,
+ sizeof(self->build_id)) == 0)
+ self->has_build_id = true;
+
+ return 0;
+}
+
static int perf_session__set_modules_path_dir(struct perf_session *self, char *dirname)
{
struct dirent *dent;
@@ -1395,6 +1419,7 @@ static int perf_session__set_modules_path_dir(struct perf_session *self, char *d
if (long_name == NULL)
goto failure;
dso__set_long_name(map->dso, long_name);
+ dso__kernel_module_get_build_id(map->dso);
}
}
@@ -1437,6 +1462,24 @@ static struct map *map__new2(u64 start, struct dso *dso, enum map_type type)
return self;
}
+struct map *perf_session__new_module_map(struct perf_session *self, u64 start,
+ const char *filename)
+{
+ struct map *map;
+ struct dso *dso = __dsos__findnew(&dsos__kernel, filename);
+
+ if (dso == NULL)
+ return NULL;
+
+ map = map__new2(start, dso, MAP__FUNCTION);
+ if (map == NULL)
+ return NULL;
+
+ dso->origin = DSO__ORIG_KMODULE;
+ map_groups__insert(&self->kmaps, map);
+ return map;
+}
+
static int perf_session__create_module_maps(struct perf_session *self)
{
char *line = NULL;
@@ -1450,7 +1493,6 @@ static int perf_session__create_module_maps(struct perf_session *self)
while (!feof(file)) {
char name[PATH_MAX];
u64 start;
- struct dso *dso;
char *sep;
int line_len;
@@ -1476,26 +1518,10 @@ static int perf_session__create_module_maps(struct perf_session *self)
*sep = '\0';
snprintf(name, sizeof(name), "[%s]", line);
- dso = dso__new(name);
-
- if (dso == NULL)
- goto out_delete_line;
-
- map = map__new2(start, dso, MAP__FUNCTION);
- if (map == NULL) {
- dso__delete(dso);
+ map = perf_session__new_module_map(self, start, name);
+ if (map == NULL)
goto out_delete_line;
- }
-
- snprintf(name, sizeof(name),
- "/sys/module/%s/notes/.note.gnu.build-id", line);
- if (sysfs__read_build_id(name, dso->build_id,
- sizeof(dso->build_id)) == 0)
- dso->has_build_id = true;
-
- dso->origin = DSO__ORIG_KMODULE;
- map_groups__insert(&self->kmaps, map);
- dsos__add(&dsos__kernel, dso);
+ dso__kernel_module_get_build_id(map->dso);
}
free(line);
@@ -1573,10 +1599,28 @@ static int dso__load_kernel_sym(struct dso *self, struct map *map,
}
}
+ /*
+ * Say the kernel DSO was created when processing the build-id header table,
+ * we have a build-id, so check if it is the same as the running kernel,
+ * using it if it is.
+ */
+ if (self->has_build_id) {
+ u8 kallsyms_build_id[BUILD_ID_SIZE];
+
+ if (sysfs__read_build_id("/sys/kernel/notes", kallsyms_build_id,
+ sizeof(kallsyms_build_id)) == 0)
+
+ is_kallsyms = dso__build_id_equal(self, kallsyms_build_id);
+ if (is_kallsyms)
+ goto do_kallsyms;
+ goto do_vmlinux;
+ }
+
is_kallsyms = self->long_name[0] == '[';
if (is_kallsyms)
goto do_kallsyms;
+do_vmlinux:
err = dso__load_vmlinux(self, map, session, self->long_name, filter);
if (err <= 0) {
pr_info("The file %s cannot be used, "
@@ -1694,16 +1738,12 @@ out_delete_kernel_dso:
return NULL;
}
-static int map_groups__create_kernel_maps(struct map_groups *self,
- struct map *vmlinux_maps[MAP__NR_TYPES],
- const char *vmlinux)
+int __map_groups__create_kernel_maps(struct map_groups *self,
+ struct map *vmlinux_maps[MAP__NR_TYPES],
+ struct dso *kernel)
{
- struct dso *kernel = dsos__create_kernel(vmlinux);
enum map_type type;
- if (kernel == NULL)
- return -1;
-
for (type = 0; type < MAP__NR_TYPES; ++type) {
vmlinux_maps[type] = map__new2(0, kernel, type);
if (vmlinux_maps[type] == NULL)
@@ -1717,6 +1757,18 @@ static int map_groups__create_kernel_maps(struct map_groups *self,
return 0;
}
+static int map_groups__create_kernel_maps(struct map_groups *self,
+ struct map *vmlinux_maps[MAP__NR_TYPES],
+ const char *vmlinux)
+{
+ struct dso *kernel = dsos__create_kernel(vmlinux);
+
+ if (kernel == NULL)
+ return -1;
+
+ return __map_groups__create_kernel_maps(self, vmlinux_maps, kernel);
+}
+
static void vmlinux_path__exit(void)
{
while (--vmlinux_path__nr_entries >= 0) {
generated by cgit v1.2.3 (git 2.25.1) at 2024-04-27 10:58:27 +0000