perf symbols: Treat all memory maps without dso file as loaded

The stack/vdso/heap memory maps dont have any dso file.  Setting the
perf dso objects as 'loaded' for these maps, we avoid unnecessary
warnings like:

  "Failed to open [stack], continuing without symbols"

All map__find_* functions still return NULL when searching for symbols
in these maps.

Link: http://lkml.kernel.org/r/20110824131834.GA2007@jolsa.brq.redhat.com
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Jiri Olsa <jolsa@redhat.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/util/map.c b/tools/perf/util/map.c
index aa2f9fd..9cf0d43 100644 (file)
--- a/tools/perf/util/map.c
+++ b/tools/perf/util/map.c
@@ -18,6 +18,13 @@ static inline int is_anon_memory(const char *filename)
        return strcmp(filename, "//anon") == 0;
 }
 
+static inline int is_no_dso_memory(const char *filename)
+{
+       return !strcmp(filename, "[stack]") ||
+              !strcmp(filename, "[vdso]")  ||
+              !strcmp(filename, "[heap]");
+}
+
 void map__init(struct map *self, enum map_type type,
               u64 start, u64 end, u64 pgoff, struct dso *dso)
 {
@@ -42,9 +49,10 @@ struct map *map__new(struct list_head *dsos__list, u64 start, u64 len,
        if (self != NULL) {
                char newfilename[PATH_MAX];
                struct dso *dso;
-               int anon;
+               int anon, no_dso;
 
                anon = is_anon_memory(filename);
+               no_dso = is_no_dso_memory(filename);
 
                if (anon) {
                        snprintf(newfilename, sizeof(newfilename), "/tmp/perf-%d.map", pid);
@@ -57,12 +65,16 @@ struct map *map__new(struct list_head *dsos__list, u64 start, u64 len,
 
                map__init(self, type, start, start + len, pgoff, dso);
 
-               if (anon) {
-set_identity:
+               if (anon || no_dso) {
                        self->map_ip = self->unmap_ip = identity__map_ip;
-               } else if (strcmp(filename, "[vdso]") == 0) {
-                       dso__set_loaded(dso, self->type);
-                       goto set_identity;
+
+                       /*
+                        * Set memory without DSO as loaded. All map__find_*
+                        * functions still return NULL, and we avoid the
+                        * unnecessary map__load warning.
+                        */
+                       if (no_dso)
+                               dso__set_loaded(dso, self->type);
                }
        }
        return self;