perf symbols: Avoid unnecessary symbol loading when dso list is specified

We were performing the full thread__find_addr_location
operation, i.e. resolving to a map/dso _and_ loading its symbols
when we can optimize it by first calling thread__find_addr_map
to find just the map/dso, check if it is one that we are
interested in (passed via --dsos/-d in 'perf annotate', 'perf
report', etc) and if not avoid loading the symtab.

Nice speedup when we know which DSO we're interested in.

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frédéric Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
LKML-Reference: <1269459619-982-2-git-send-email-acme@infradead.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/tools/perf/util/event.c b/tools/perf/util/event.c
index 705ec63..c2808ad 100644 (file)
--- a/tools/perf/util/event.c
+++ b/tools/perf/util/event.c
@@ -513,24 +513,32 @@ int event__preprocess_sample(const event_t *self, struct perf_session *session,
 
        dump_printf(" ... thread: %s:%d\n", thread->comm, thread->pid);
 
-       thread__find_addr_location(thread, session, cpumode, MAP__FUNCTION,
-                                  self->ip.ip, al, filter);
+       thread__find_addr_map(thread, session, cpumode, MAP__FUNCTION,
+                             self->ip.ip, al);
        dump_printf(" ...... dso: %s\n",
                    al->map ? al->map->dso->long_name :
                        al->level == 'H' ? "[hypervisor]" : "<not found>");
-       /*
-        * We have to do this here as we may have a dso with no symbol hit that
-        * has a name longer than the ones with symbols sampled.
-        */
-       if (al->map && !sort_dso.elide && !al->map->dso->slen_calculated)
-               dso__calc_col_width(al->map->dso);
-
-       if (symbol_conf.dso_list &&
-           (!al->map || !al->map->dso ||
-            !(strlist__has_entry(symbol_conf.dso_list, al->map->dso->short_name) ||
-              (al->map->dso->short_name != al->map->dso->long_name &&
-               strlist__has_entry(symbol_conf.dso_list, al->map->dso->long_name)))))
-               goto out_filtered;
+       al->sym = NULL;
+
+       if (al->map) {
+               if (symbol_conf.dso_list &&
+                   (!al->map || !al->map->dso ||
+                    !(strlist__has_entry(symbol_conf.dso_list,
+                                         al->map->dso->short_name) ||
+                      (al->map->dso->short_name != al->map->dso->long_name &&
+                       strlist__has_entry(symbol_conf.dso_list,
+                                          al->map->dso->long_name)))))
+                       goto out_filtered;
+               /*
+                * We have to do this here as we may have a dso with no symbol
+                * hit that has a name longer than the ones with symbols
+                * sampled.
+                */
+               if (!sort_dso.elide && !al->map->dso->slen_calculated)
+                       dso__calc_col_width(al->map->dso);
+
+               al->sym = map__find_symbol(al->map, al->addr, filter);
+       }
 
        if (symbol_conf.sym_list && al->sym &&
            !strlist__has_entry(symbol_conf.sym_list, al->sym->name))