perf unwind: Fix libunwind when tid != pid

Commit e5adfc3e7e77 ("perf map: Synthesize maps only for thread group
leader") changed the recording side so that we no longer get mmap events
for threads other than the thread group leader (when synthesising these
events for threads which exist before perf is started).

When a file recorded after this change is loaded, the lack of mmap
records mean that unwinding is not set up for any other threads.

This can be seen in a simple record/report scenario:

	perf record --call-graph=dwarf -t $TID
	perf report

If $TID is a process ID then the report will show call graphs, but if
$TID is a secondary thread the output is as if --call-graph=none was
specified.

Following the rationale in that commit, move the libunwind fields into
struct map_groups and update the libunwind functions to take this
instead of the struct thread.  This is only required for
unwind__finish_access which must now be called from map_groups__delete
and the others are changed for symmetry.

Note that unwind__get_entries keeps the thread argument since it is
required for symbol lookup and the libdw unwind provider uses the thread
ID.

Signed-off-by: John Keeping <john@metanate.com>
Reviewed-by: Jiri Olsa <jolsa@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Fixes: e5adfc3e7e77 ("perf map: Synthesize maps only for thread group leader")
Link: http://lkml.kernel.org/r/20190815100146.28842-2-john@metanate.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 44b556812e4b341869fba7209f86cf6149381b9d..27b7b102e4a2f2462db11baf01b9911810699c74 100644 (file)
--- a/tools/perf/util/map.c
+++ b/tools/perf/util/map.c
@@ -647,6 +647,7 @@ struct map_groups *map_groups__new(struct machine *machine)
 void map_groups__delete(struct map_groups *mg)
 {
        map_groups__exit(mg);
+       unwind__finish_access(mg);
        free(mg);
 }
 
@@ -887,7 +888,7 @@ int map_groups__clone(struct thread *thread, struct map_groups *parent)
                if (new == NULL)
                        goto out_unlock;
 
-               err = unwind__prepare_access(thread, new, NULL);
+               err = unwind__prepare_access(mg, new, NULL);
                if (err)
                        goto out_unlock;
 

diff --git a/tools/perf/util/map_groups.h b/tools/perf/util/map_groups.h
index 5f25efa6d6bcdf07205e9f1891f4f74ff33633ea..77252e14008fbc0f98fab3d5aac87ca3c09682b5 100644 (file)
--- a/tools/perf/util/map_groups.h
+++ b/tools/perf/util/map_groups.h
@@ -31,6 +31,10 @@ struct map_groups {
        struct maps      maps;
        struct machine   *machine;
        refcount_t       refcnt;
+#ifdef HAVE_LIBUNWIND_SUPPORT
+       void                            *addr_space;
+       struct unwind_libunwind_ops     *unwind_libunwind_ops;
+#endif
 };
 
 #define KMAP_NAME_LEN 256

diff --git a/tools/perf/util/thread.c b/tools/perf/util/thread.c
index 590793cc51424c163b99e5e35f58b2609f206d70..bbf7816cba31c4d0233f12f1407ca6b4755f626d 100644 (file)
--- a/tools/perf/util/thread.c
+++ b/tools/perf/util/thread.c
@@ -105,7 +105,6 @@ void thread__delete(struct thread *thread)
        }
        up_write(&thread->comm_lock);
 
-       unwind__finish_access(thread);
        nsinfo__zput(thread->nsinfo);
        srccode_state_free(&thread->srccode_state);
 
@@ -252,7 +251,7 @@ static int ____thread__set_comm(struct thread *thread, const char *str,
                list_add(&new->list, &thread->comm_list);
 
                if (exec)
-                       unwind__flush_access(thread);
+                       unwind__flush_access(thread->mg);
        }
 
        thread->comm_set = true;
@@ -332,7 +331,7 @@ int thread__insert_map(struct thread *thread, struct map *map)
 {
        int ret;
 
-       ret = unwind__prepare_access(thread, map, NULL);
+       ret = unwind__prepare_access(thread->mg, map, NULL);
        if (ret)
                return ret;
 
@@ -352,7 +351,7 @@ static int __thread__prepare_access(struct thread *thread)
        down_read(&maps->lock);
 
        for (map = maps__first(maps); map; map = map__next(map)) {
-               err = unwind__prepare_access(thread, map, &initialized);
+               err = unwind__prepare_access(thread->mg, map, &initialized);
                if (err || initialized)
                        break;
        }

diff --git a/tools/perf/util/thread.h b/tools/perf/util/thread.h
index e97ef6977eb91c120ce08c78bd17f4dad4b777f1..bf06113be4f3f5fec29827a0df1c6e046d52087b 100644 (file)
--- a/tools/perf/util/thread.h
+++ b/tools/perf/util/thread.h
@@ -44,10 +44,6 @@ struct thread {
        struct thread_stack     *ts;
        struct nsinfo           *nsinfo;
        struct srccode_state    srccode_state;
-#ifdef HAVE_LIBUNWIND_SUPPORT
-       void                            *addr_space;
-       struct unwind_libunwind_ops     *unwind_libunwind_ops;
-#endif
        bool                    filter;
        int                     filter_entry_depth;
 };

diff --git a/tools/perf/util/unwind-libunwind-local.c b/tools/perf/util/unwind-libunwind-local.c
index 71a788921b621f911358a301877da2fe3753f4ee..ebdbb056510cb53c4656116dc2f2992a437586d3 100644 (file)
--- a/tools/perf/util/unwind-libunwind-local.c
+++ b/tools/perf/util/unwind-libunwind-local.c
@@ -616,26 +616,26 @@ static unw_accessors_t accessors = {
        .get_proc_name          = get_proc_name,
 };
 
-static int _unwind__prepare_access(struct thread *thread)
+static int _unwind__prepare_access(struct map_groups *mg)
 {
-       thread->addr_space = unw_create_addr_space(&accessors, 0);
-       if (!thread->addr_space) {
+       mg->addr_space = unw_create_addr_space(&accessors, 0);
+       if (!mg->addr_space) {
                pr_err("unwind: Can't create unwind address space.\n");
                return -ENOMEM;
        }
 
-       unw_set_caching_policy(thread->addr_space, UNW_CACHE_GLOBAL);
+       unw_set_caching_policy(mg->addr_space, UNW_CACHE_GLOBAL);
        return 0;
 }
 
-static void _unwind__flush_access(struct thread *thread)
+static void _unwind__flush_access(struct map_groups *mg)
 {
-       unw_flush_cache(thread->addr_space, 0, 0);
+       unw_flush_cache(mg->addr_space, 0, 0);
 }
 
-static void _unwind__finish_access(struct thread *thread)
+static void _unwind__finish_access(struct map_groups *mg)
 {
-       unw_destroy_addr_space(thread->addr_space);
+       unw_destroy_addr_space(mg->addr_space);
 }
 
 static int get_entries(struct unwind_info *ui, unwind_entry_cb_t cb,
@@ -660,7 +660,7 @@ static int get_entries(struct unwind_info *ui, unwind_entry_cb_t cb,
         */
        if (max_stack - 1 > 0) {
                WARN_ONCE(!ui->thread, "WARNING: ui->thread is NULL");
-               addr_space = ui->thread->addr_space;
+               addr_space = ui->thread->mg->addr_space;
 
                if (addr_space == NULL)
                        return -1;

diff --git a/tools/perf/util/unwind-libunwind.c b/tools/perf/util/unwind-libunwind.c
index c0811977d7d542c613bd489c6e8f636aeb75a2ff..b843f9d0a9ea2353908768e51c804f3c2a69473d 100644 (file)
--- a/tools/perf/util/unwind-libunwind.c
+++ b/tools/perf/util/unwind-libunwind.c
@@ -11,13 +11,13 @@ struct unwind_libunwind_ops __weak *local_unwind_libunwind_ops;
 struct unwind_libunwind_ops __weak *x86_32_unwind_libunwind_ops;
 struct unwind_libunwind_ops __weak *arm64_unwind_libunwind_ops;
 
-static void unwind__register_ops(struct thread *thread,
+static void unwind__register_ops(struct map_groups *mg,
                          struct unwind_libunwind_ops *ops)
 {
-       thread->unwind_libunwind_ops = ops;
+       mg->unwind_libunwind_ops = ops;
 }
 
-int unwind__prepare_access(struct thread *thread, struct map *map,
+int unwind__prepare_access(struct map_groups *mg, struct map *map,
                           bool *initialized)
 {
        const char *arch;
@@ -28,7 +28,7 @@ int unwind__prepare_access(struct thread *thread, struct map *map,
        if (!dwarf_callchain_users)
                return 0;
 
-       if (thread->addr_space) {
+       if (mg->addr_space) {
                pr_debug("unwind: thread map already set, dso=%s\n",
                         map->dso->name);
                if (initialized)
@@ -37,14 +37,14 @@ int unwind__prepare_access(struct thread *thread, struct map *map,
        }
 
        /* env->arch is NULL for live-mode (i.e. perf top) */
-       if (!thread->mg->machine->env || !thread->mg->machine->env->arch)
+       if (!mg->machine->env || !mg->machine->env->arch)
                goto out_register;
 
-       dso_type = dso__type(map->dso, thread->mg->machine);
+       dso_type = dso__type(map->dso, mg->machine);
        if (dso_type == DSO__TYPE_UNKNOWN)
                return 0;
 
-       arch = perf_env__arch(thread->mg->machine->env);
+       arch = perf_env__arch(mg->machine->env);
 
        if (!strcmp(arch, "x86")) {
                if (dso_type != DSO__TYPE_64BIT)
@@ -59,37 +59,37 @@ int unwind__prepare_access(struct thread *thread, struct map *map,
                return 0;
        }
 out_register:
-       unwind__register_ops(thread, ops);
+       unwind__register_ops(mg, ops);
 
-       err = thread->unwind_libunwind_ops->prepare_access(thread);
+       err = mg->unwind_libunwind_ops->prepare_access(mg);
        if (initialized)
                *initialized = err ? false : true;
        return err;
 }
 
-void unwind__flush_access(struct thread *thread)
+void unwind__flush_access(struct map_groups *mg)
 {
        if (!dwarf_callchain_users)
                return;
 
-       if (thread->unwind_libunwind_ops)
-               thread->unwind_libunwind_ops->flush_access(thread);
+       if (mg->unwind_libunwind_ops)
+               mg->unwind_libunwind_ops->flush_access(mg);
 }
 
-void unwind__finish_access(struct thread *thread)
+void unwind__finish_access(struct map_groups *mg)
 {
        if (!dwarf_callchain_users)
                return;
 
-       if (thread->unwind_libunwind_ops)
-               thread->unwind_libunwind_ops->finish_access(thread);
+       if (mg->unwind_libunwind_ops)
+               mg->unwind_libunwind_ops->finish_access(mg);
 }
 
 int unwind__get_entries(unwind_entry_cb_t cb, void *arg,
                         struct thread *thread,
                         struct perf_sample *data, int max_stack)
 {
-       if (thread->unwind_libunwind_ops)
-               return thread->unwind_libunwind_ops->get_entries(cb, arg, thread, data, max_stack);
+       if (thread->mg->unwind_libunwind_ops)
+               return thread->mg->unwind_libunwind_ops->get_entries(cb, arg, thread, data, max_stack);
        return 0;
 }

diff --git a/tools/perf/util/unwind.h b/tools/perf/util/unwind.h
index 8a44a1569a21bc2a20eb0c96c70112b3f818ec02..3a7d00c20d86227f18943833408c9957680a9de6 100644 (file)
--- a/tools/perf/util/unwind.h
+++ b/tools/perf/util/unwind.h
@@ -6,6 +6,7 @@
 #include <linux/types.h>
 
 struct map;
+struct map_groups;
 struct perf_sample;
 struct symbol;
 struct thread;
@@ -19,9 +20,9 @@ struct unwind_entry {
 typedef int (*unwind_entry_cb_t)(struct unwind_entry *entry, void *arg);
 
 struct unwind_libunwind_ops {
-       int (*prepare_access)(struct thread *thread);
-       void (*flush_access)(struct thread *thread);
-       void (*finish_access)(struct thread *thread);
+       int (*prepare_access)(struct map_groups *mg);
+       void (*flush_access)(struct map_groups *mg);
+       void (*finish_access)(struct map_groups *mg);
        int (*get_entries)(unwind_entry_cb_t cb, void *arg,
                           struct thread *thread,
                           struct perf_sample *data, int max_stack);
@@ -46,20 +47,20 @@ int unwind__get_entries(unwind_entry_cb_t cb, void *arg,
 #endif
 
 int LIBUNWIND__ARCH_REG_ID(int regnum);
-int unwind__prepare_access(struct thread *thread, struct map *map,
+int unwind__prepare_access(struct map_groups *mg, struct map *map,
                           bool *initialized);
-void unwind__flush_access(struct thread *thread);
-void unwind__finish_access(struct thread *thread);
+void unwind__flush_access(struct map_groups *mg);
+void unwind__finish_access(struct map_groups *mg);
 #else
-static inline int unwind__prepare_access(struct thread *thread __maybe_unused,
+static inline int unwind__prepare_access(struct map_groups *mg __maybe_unused,
                                         struct map *map __maybe_unused,
                                         bool *initialized __maybe_unused)
 {
        return 0;
 }
 
-static inline void unwind__flush_access(struct thread *thread __maybe_unused) {}
-static inline void unwind__finish_access(struct thread *thread __maybe_unused) {}
+static inline void unwind__flush_access(struct map_groups *mg __maybe_unused) {}
+static inline void unwind__finish_access(struct map_groups *mg __maybe_unused) {}
 #endif
 #else
 static inline int
@@ -72,14 +73,14 @@ unwind__get_entries(unwind_entry_cb_t cb __maybe_unused,
        return 0;
 }
 
-static inline int unwind__prepare_access(struct thread *thread __maybe_unused,
+static inline int unwind__prepare_access(struct map_groups *mg __maybe_unused,
                                         struct map *map __maybe_unused,
                                         bool *initialized __maybe_unused)
 {
        return 0;
 }
 
-static inline void unwind__flush_access(struct thread *thread __maybe_unused) {}
-static inline void unwind__finish_access(struct thread *thread __maybe_unused) {}
+static inline void unwind__flush_access(struct map_groups *mg __maybe_unused) {}
+static inline void unwind__finish_access(struct map_groups *mg __maybe_unused) {}
 #endif /* HAVE_DWARF_UNWIND_SUPPORT */
 #endif /* __UNWIND_H */