perf symbols: Fix kallsyms kernel/module map splitting

On ARM, module addresss space is ahead of kernel space, so the module
symbols are handled before kernel symbol in dso__split_kallsyms, then
was causing one map to be created for each kernel symbol.

Reported-by: Ming Lei <tom.leiming@gmail.com>
Tested-by: Ming Lei <tom.leiming@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Ming Lei <tom.leiming@gmail.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Tom Zanussi <tzanussi@gmail.com>
LKML-Reference: <20101124144540.GB15875@ghostprotocols.net>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
index 0500895..2af4d7d 100644 (file)
--- a/tools/perf/util/symbol.c
+++ b/tools/perf/util/symbol.c
@@ -532,7 +532,7 @@ static int dso__split_kallsyms(struct dso *self, struct map *map,
        struct machine *machine = kmaps->machine;
        struct map *curr_map = map;
        struct symbol *pos;
-       int count = 0;
+       int count = 0, moved = 0;       
        struct rb_root *root = &self->symbols[map->type];
        struct rb_node *next = rb_first(root);
        int kernel_range = 0;
@@ -590,6 +590,11 @@ static int dso__split_kallsyms(struct dso *self, struct map *map,
                        char dso_name[PATH_MAX];
                        struct dso *dso;
 
+                       if (count == 0) {
+                               curr_map = map;
+                               goto filter_symbol;
+                       }
+
                        if (self->kernel == DSO_TYPE_GUEST_KERNEL)
                                snprintf(dso_name, sizeof(dso_name),
                                        "[guest.kernel].%d",
@@ -615,7 +620,7 @@ static int dso__split_kallsyms(struct dso *self, struct map *map,
                        map_groups__insert(kmaps, curr_map);
                        ++kernel_range;
                }
-
+filter_symbol:
                if (filter && filter(curr_map, pos)) {
 discard_symbol:                rb_erase(&pos->rb_node, root);
                        symbol__delete(pos);
@@ -623,8 +628,9 @@ discard_symbol:             rb_erase(&pos->rb_node, root);
                        if (curr_map != map) {
                                rb_erase(&pos->rb_node, root);
                                symbols__insert(&curr_map->dso->symbols[curr_map->type], pos);
-                       }
-                       count++;
+                               ++moved;
+                       } else
+                               ++count;
                }
        }
 
@@ -634,7 +640,7 @@ discard_symbol:             rb_erase(&pos->rb_node, root);
                dso__set_loaded(curr_map->dso, curr_map->type);
        }
 
-       return count;
+       return count + moved;
 }
 
 int dso__load_kallsyms(struct dso *self, const char *filename,