perf symbols: Rename kthreads to kmaps, using another abstraction for it

Using a struct thread instance just to hold the kernel space maps
(vmlinux + modules) is overkill and confuses people trying to
understand the perf symbols abstractions.

The kernel maps are really present in all threads, i.e. the kernel
is a library, not a separate thread.

So introduce the 'map_groups' abstraction and use it for the kernel
maps, now in the kmaps global variable.

It, in turn, will move, together with the threads list to the
perf_file abstraction, so that we can support multiple perf_file
instances, needed by perf diff.

Brainstormed-with: Eduardo Habkost <ehabkost@redhat.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Eduardo Habkost <ehabkost@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: <1260550239-5372-1-git-send-email-acme@infradead.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 25 insertions, 14 deletions

diff --git a/tools/perf/util/thread.h b/tools/perf/util/thread.h
index 686d6e914d9e..a6333f3716af 100644
--- a/tools/perf/util/thread.h
+++ b/tools/perf/util/thread.h
@@ -5,52 +5,63 @@
 #include <unistd.h>
 #include "symbol.h"
 
-struct thread {
-        struct rb_node          rb_node;
+struct map_groups {
         struct rb_root          maps[MAP__NR_TYPES];
         struct list_head        removed_maps[MAP__NR_TYPES];
-        pid_t                   pid;
         bool                    use_modules;
+};
+
+struct thread {
+        struct rb_node          rb_node;
+        struct map_groups       mg;
+        pid_t                   pid;
         char                    shortname[3];
         char                    *comm;
         int                     comm_len;
 };
 
-void thread__init(struct thread *self, pid_t pid);
+void map_groups__init(struct map_groups *self);
 int thread__set_comm(struct thread *self, const char *comm);
 int thread__comm_len(struct thread *self);
 struct thread *threads__findnew(pid_t pid);
 struct thread *register_idle_thread(void);
 void thread__insert_map(struct thread *self, struct map *map);
 int thread__fork(struct thread *self, struct thread *parent);
-size_t thread__fprintf_maps(struct thread *self, FILE *fp);
+size_t map_groups__fprintf_maps(struct map_groups *self, FILE *fp);
 size_t threads__fprintf(FILE *fp);
 
 void maps__insert(struct rb_root *maps, struct map *map);
 struct map *maps__find(struct rb_root *maps, u64 addr);
 
-static inline struct map *thread__find_map(struct thread *self,
+static inline void map_groups__insert(struct map_groups *self, struct map *map)
+{
+         maps__insert(&self->maps[map->type], map);
+}
+
+static inline struct map *map_groups__find(struct map_groups *self,
                                            enum map_type type, u64 addr)
 {
-        return self ? maps__find(&self->maps[type], addr) : NULL;
+        return maps__find(&self->maps[type], addr);
 }
 
-static inline void __thread__insert_map(struct thread *self, struct map *map)
+static inline struct map *thread__find_map(struct thread *self,
+                                           enum map_type type, u64 addr)
 {
-         maps__insert(&self->maps[map->type], map);
+        return self ? map_groups__find(&self->mg, type, addr) : NULL;
 }
 
 void thread__find_addr_location(struct thread *self, u8 cpumode,
                                 enum map_type type, u64 addr,
                                 struct addr_location *al,
                                 symbol_filter_t filter);
-struct symbol *thread__find_symbol(struct thread *self,
-                                   enum map_type type, u64 addr,
-                                   symbol_filter_t filter);
+struct symbol *map_groups__find_symbol(struct map_groups *self,
+                                       enum map_type type, u64 addr,
+                                       symbol_filter_t filter);
 
 static inline struct symbol *
-thread__find_function(struct thread *self, u64 addr, symbol_filter_t filter)
+map_groups__find_function(struct map_groups *self, u64 addr,
+                          symbol_filter_t filter)
 {
-        return thread__find_symbol(self, MAP__FUNCTION, addr, filter);
+        return map_groups__find_symbol(self, MAP__FUNCTION, addr, filter);
 }
 #endif  /* __PERF_THREAD_H */