Re: [PATCH -tip v2 2/6] perf script: add magic word to indicate the failure of resolving symbols

David Ahern
2011-07-17T16:07:05Z

On 07/17/2011 03:30 AM, Akihiro Nagai wrote:
> Latest perf-script doesn't output symbol name when it failed to
> resolve symbol name. This output is not friendly for external scripts
> because it causes misaligment. So, this patch adds the magic word
> "(unknown)" when perf-script failed to resolve symbols.

Code has [unknown] with {}, not ().

>
> At the same time, this patch changes perf-script to output "[unknown]"
> in the DSO field, when it failed to resolve the path of DSOs.
>
> Changes in v2:
> - add this patch
>
> Signed-off-by: Akihiro Nagai <akihiro.nagai.hw@hitachi.com>
> Cc: Peter Zijlstra <peterz@infradead.org>
> Cc: Frederic Weisbecker <fweisbec@gmail.com>
> Cc: Paul Mackerras <paulus@samba.org>
> Cc: Ingo Molnar <mingo@elte.hu>
> Cc: Arnaldo Carvalho de Melo <acme@infradead.org>
> Cc: David Ahern <dsahern@gmail.com>
> Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
> ---
>
> tools/perf/builtin-script.c | 18 +++++-------------
> tools/perf/util/map.c | 12 ++++++++++++
> tools/perf/util/map.h | 1 +
> tools/perf/util/session.c | 35 ++++++++++-------------------------
> tools/perf/util/symbol.c | 12 ++++++++++++
> tools/perf/util/symbol.h | 1 +
> 6 files changed, 41 insertions(+), 38 deletions(-)
>
> diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c
> index 09024ec..b3e0951 100644
> --- a/tools/perf/builtin-script.c
> +++ b/tools/perf/builtin-script.c
> @@ -320,7 +320,6 @@ static void print_sample_addr(union perf_event *event,
> {
> struct addr_location al;
> u8 cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
> - const char *symname, *dsoname;
>
> printf("%16" PRIx64, sample->addr);
>
> @@ -340,21 +339,14 @@ static void print_sample_addr(union perf_event *event,
> al.sym = map__find_symbol(al.map, al.addr, NULL);
>
> if (PRINT_FIELD(SYM)) {
> - if (al.sym && al.sym->name)
> - symname = al.sym->name;
> - else
> - symname = "";
> -
> - printf(" %16s", symname);
> + printf(" ");
> + symbol__print_symname(al.sym);
> }
>
> if (PRINT_FIELD(DSO)) {
> - if (al.map && al.map->dso && al.map->dso->name)
> - dsoname = al.map->dso->name;
> - else
> - dsoname = "";
> -
> - printf(" (%s)", dsoname);
> + printf(" (");
> + map__print_dsoname(al.map);
> + printf(")");
> }
> }
>
> diff --git a/tools/perf/util/map.c b/tools/perf/util/map.c
> index a16ecab..dddc0f3 100644
> --- a/tools/perf/util/map.c
> +++ b/tools/perf/util/map.c
> @@ -200,6 +200,18 @@ size_t map__fprintf(struct map *self, FILE *fp)
> self->start, self->end, self->pgoff, self->dso->name);
> }
>
> +void map__print_dsoname(struct map *self)
> +{
> + const char *dsoname;
> +
> + if (self && self->dso && self->dso->name)
> + dsoname = self->dso->name;

extra tab in the above line.

Otherwise looks good to me.

Acked-By: dsahern@gmail.com

> + else
> + dsoname = "[unknown]";
> +
> + printf("%s", dsoname);
> +}
> +
> /*
> * objdump wants/reports absolute IPs for ET_EXEC, and RIPs for ET_DYN.
> * map->dso->adjust_symbols==1 for ET_EXEC-like cases.
> diff --git a/tools/perf/util/map.h b/tools/perf/util/map.h
> index b397c03..6f452b9 100644
> --- a/tools/perf/util/map.h
> +++ b/tools/perf/util/map.h
> @@ -112,6 +112,7 @@ void map__delete(struct map *self);
> struct map *map__clone(struct map *self);
> int map__overlap(struct map *l, struct map *r);
> size_t map__fprintf(struct map *self, FILE *fp);
> +void map__print_dsoname(struct map *self);
>
> int map__load(struct map *self, symbol_filter_t filter);
> struct symbol *map__find_symbol(struct map *self,
> diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
> index 453a010..442be3a 100644
> --- a/tools/perf/util/session.c
> +++ b/tools/perf/util/session.c
> @@ -1214,7 +1214,6 @@ void perf_session__print_ip(union perf_event *event,
> int print_sym, int print_dso)
> {
> struct addr_location al;
> - const char *symname, *dsoname;
> struct callchain_cursor *cursor = &session->callchain_cursor;
> struct callchain_cursor_node *node;
>
> @@ -1242,20 +1241,13 @@ void perf_session__print_ip(union perf_event *event,
>
> printf("\t%16" PRIx64, node->ip);
> if (print_sym) {
> - if (node->sym && node->sym->name)
> - symname = node->sym->name;
> - else
> - symname = "";
> -
> - printf(" %s", symname);
> + printf(" ");
> + symbol__print_symname(node->sym);
> }
> if (print_dso) {
> - if (node->map && node->map->dso && node->map->dso->name)
> - dsoname = node->map->dso->name;
> - else
> - dsoname = "";
> -
> - printf(" (%s)", dsoname);
> + printf(" (");
> + map__print_dsoname(al.map);
> + printf(")");
> }
> printf("\n");
>
> @@ -1265,21 +1257,14 @@ void perf_session__print_ip(union perf_event *event,
> } else {
> printf("%16" PRIx64, sample->ip);
> if (print_sym) {
> - if (al.sym && al.sym->name)
> - symname = al.sym->name;
> - else
> - symname = "";
> -
> - printf(" %s", symname);
> + printf(" ");
> + symbol__print_symname(al.sym);
> }
>
> if (print_dso) {
> - if (al.map && al.map->dso && al.map->dso->name)
> - dsoname = al.map->dso->name;
> - else
> - dsoname = "";
> -
> - printf(" (%s)", dsoname);
> + printf(" (");
> + map__print_dsoname(al.map);
> + printf(")");
> }
> }
> }
> diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
> index eec1963..85e19c4 100644
> --- a/tools/perf/util/symbol.c
> +++ b/tools/perf/util/symbol.c
> @@ -175,6 +175,18 @@ static size_t symbol__fprintf(struct symbol *sym, FILE *fp)
> sym->name);
> }
>
> +void symbol__print_symname(const struct symbol *sym)
> +{
> + const char *symname;
> +
> + if (sym && sym->name)
> + symname = sym->name;
> + else
> + symname = "(unknown)";
> +
> + printf("%s", symname);
> +}
> +
> void dso__set_long_name(struct dso *dso, char *name)
> {
> if (name == NULL)
> diff --git a/tools/perf/util/symbol.h b/tools/perf/util/symbol.h
> index 325ee36..1ec17b4 100644
> --- a/tools/perf/util/symbol.h
> +++ b/tools/perf/util/symbol.h
> @@ -238,6 +238,7 @@ void machines__destroy_guest_kernel_maps(struct rb_root *machines);
>
> int symbol__init(void);
> void symbol__exit(void);
> +void symbol__print_symname(const struct symbol *sym);
> bool symbol_type__is_a(char symbol_type, enum map_type map_type);
>
> size_t machine__fprintf_vmlinux_path(struct machine *machine, FILE *fp);
>