From: John Keeping john@metanate.com
[ Upstream commit e8ba2906f6b9054102ad035ac9cafad9d4168589 ]
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 Signed-off-by: Sasha Levin sashal@kernel.org --- tools/perf/util/map.c | 3 ++- tools/perf/util/map_groups.h | 4 +++ tools/perf/util/thread.c | 7 +++-- tools/perf/util/thread.h | 4 --- tools/perf/util/unwind-libunwind-local.c | 18 ++++++------- tools/perf/util/unwind-libunwind.c | 34 ++++++++++++------------ tools/perf/util/unwind.h | 25 ++++++++--------- 7 files changed, 48 insertions(+), 47 deletions(-)
diff --git a/tools/perf/util/map.c b/tools/perf/util/map.c index 668410b1d426f..7666206d06fa7 100644 --- 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 5f25efa6d6bcd..77252e14008fb 100644 --- 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 590793cc51424..bbf7816cba31c 100644 --- 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 e97ef6977eb91..bf06113be4f3f 100644 --- 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 71a788921b621..ebdbb056510cb 100644 --- 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 c0811977d7d54..b843f9d0a9ea2 100644 --- 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 8a44a1569a21b..3a7d00c20d862 100644 --- 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 */