perf tools: Use kmod_path__parse for machine__new_dso

Using kmod_path__parse to get the module name and update the dso short
name within machine__new_dso function.

This way it's done only first time when dso is created, unlike the
current way when we update it all the time we process memory map of the
kernel module.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/n/tip-8gjmt1ggf5ls1xkk7qi2ko4k@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/machine.c

@@ -460,14 +460,15 @@ int machine__process_lost_event(struct machine *machine __maybe_unused,
 	return 0;
 }
 
-static struct dso *machine__module_dso(struct machine *machine, const char *filename)
+static struct dso*
+machine__module_dso(struct machine *machine, struct kmod_path *m,
+		    const char *filename)
 {
 	struct dso *dso;
-	bool compressed;
 
-	dso = dsos__find(&machine->kernel_dsos, filename, false);
+	dso = dsos__find(&machine->kernel_dsos, m->name, true);
 	if (!dso) {
-		dso = dsos__addnew(&machine->kernel_dsos, filename);
+		dso = dsos__addnew(&machine->kernel_dsos, m->name);
 		if (dso == NULL)
 			return NULL;
 
@@ -477,8 +478,11 @@ static struct dso *machine__module_dso(struct machine *machine, const char *file
 			dso->symtab_type = DSO_BINARY_TYPE__GUEST_KMODULE;
 
 		/* _KMODULE_COMP should be next to _KMODULE */
-		if (is_kernel_module(filename, &compressed) && compressed)
+		if (m->kmod && m->comp)
 			dso->symtab_type++;
+
+		dso__set_short_name(dso, strdup(m->name), true);
+		dso__set_long_name(dso, strdup(filename), true);
 	}
 
 	return dso;
@@ -487,17 +491,25 @@ static struct dso *machine__module_dso(struct machine *machine, const char *file
 struct map *machine__new_module(struct machine *machine, u64 start,
 				const char *filename)
 {
-	struct map *map;
-	struct dso *dso = machine__module_dso(machine, filename);
+	struct map *map = NULL;
+	struct dso *dso;
+	struct kmod_path m;
 
-	if (dso == NULL)
+	if (kmod_path__parse_name(&m, filename))
 		return NULL;
 
+	dso = machine__module_dso(machine, &m, filename);
+	if (dso == NULL)
+		goto out;
+
 	map = map__new2(start, dso, MAP__FUNCTION);
 	if (map == NULL)
-		return NULL;
+		goto out;
 
 	map_groups__insert(&machine->kmaps, map);
+
+out:
+	free(m.name);
 	return map;
 }
 
@@ -1058,40 +1070,11 @@ static int machine__process_kernel_mmap_event(struct machine *machine,
 				strlen(kmmap_prefix) - 1) == 0;
 	if (event->mmap.filename[0] == '/' ||
 	    (!is_kernel_mmap && event->mmap.filename[0] == '[')) {
-
-		char short_module_name[1024];
-		char *name, *dot;
-
-		if (event->mmap.filename[0] == '/') {
-			name = strrchr(event->mmap.filename, '/');
-			if (name == NULL)
-				goto out_problem;
-
-			++name; /* skip / */
-			dot = strrchr(name, '.');
-			if (dot == NULL)
-				goto out_problem;
-			/* On some system, modules are compressed like .ko.gz */
-			if (is_supported_compression(dot + 1))
-				dot -= 3;
-			if (!is_kmodule_extension(dot + 1))
-				goto out_problem;
-			snprintf(short_module_name, sizeof(short_module_name),
-					"[%.*s]", (int)(dot - name), name);
-			strxfrchar(short_module_name, '-', '_');
-		} else
-			strcpy(short_module_name, event->mmap.filename);
-
 		map = machine__new_module(machine, event->mmap.start,
 					  event->mmap.filename);
 		if (map == NULL)
 			goto out_problem;
 
-		name = strdup(short_module_name);
-		if (name == NULL)
-			goto out_problem;
-
-		dso__set_short_name(map->dso, name, true);
 		map->end = map->start + event->mmap.len;
 	} else if (is_kernel_mmap) {
 		const char *symbol_name = (event->mmap.filename +