perf tools: Delay loading symtabs till we hit a map with it

So that we can have a quicker start on perf top and even
speedups in the other tools, as we can have maps with no hits,
so no need to load its symtabs.

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Mike Galbraith <efault@gmx.de>
LKML-Reference: <1256773881-4191-1-git-send-email-acme@infradead.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 22 insertions, 16 deletions

diff --git a/tools/perf/util/map.c b/tools/perf/util/map.c
index c1c5568..d302e51 100644
--- a/tools/perf/util/map.c
+++ b/tools/perf/util/map.c
@@ -21,7 +21,7 @@ static int strcommon(const char *pathname, char *cwd, int cwdlen)
 }
 
 struct map *map__new(struct mmap_event *event, char *cwd, int cwdlen,
-		     unsigned int sym_priv_size, symbol_filter_t filter)
+		     unsigned int sym_priv_size)
 {
 	struct map *self = malloc(sizeof(*self));
 
@@ -29,7 +29,6 @@ struct map *map__new(struct mmap_event *event, char *cwd, int cwdlen,
 		const char *filename = event->filename;
 		char newfilename[PATH_MAX];
 		int anon;
-		bool new_dso;
 
 		if (cwd) {
 			int n = strcommon(filename, cwd, cwdlen);
@@ -52,23 +51,10 @@ struct map *map__new(struct mmap_event *event, char *cwd, int cwdlen,
 		self->end   = event->start + event->len;
 		self->pgoff = event->pgoff;
 
-		self->dso = dsos__findnew(filename, sym_priv_size, &new_dso);
+		self->dso = dsos__findnew(filename, sym_priv_size);
 		if (self->dso == NULL)
 			goto out_delete;
 
-		if (new_dso) {
-			int nr = dso__load(self->dso, self, filter);
-
-			if (nr < 0)
-				pr_warning("Failed to open %s, continuing "
-					   "without symbols\n",
-					   self->dso->long_name);
-			else if (nr == 0)
-				pr_warning("No symbols found in %s, maybe "
-					   "install a debug package?\n",
-					   self->dso->long_name);
-		}
-
 		if (self->dso == vdso || anon)
 			self->map_ip = self->unmap_ip = identity__map_ip;
 		else {
@@ -82,6 +68,26 @@ out_delete:
 	return NULL;
 }
 
+struct symbol *
+map__find_symbol(struct map *self, u64 ip, symbol_filter_t filter)
+{
+	if (!self->dso->loaded) {
+		int nr = dso__load(self->dso, self, filter);
+
+		if (nr < 0) {
+			pr_warning("Failed to open %s, continuing without symbols\n",
+				   self->dso->long_name);
+			return NULL;
+		} else if (nr == 0) {
+			pr_warning("No symbols found in %s, maybe install a debug package?\n",
+				   self->dso->long_name);
+			return NULL;
+		}
+	}
+
+	return self->dso->find_symbol(self->dso, ip);
+}
+
 struct map *map__clone(struct map *self)
 {
 	struct map *map = malloc(sizeof(*self));