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Subject[PATCH -tip v4 4/5] perf script: add the offset field specifier
Date
Add the offset field specifier 'offs' to show the offset from
the symbols in the output of perf-script. We can get the more
detailed address information.

Output sample:
# perf script -f ip,addr,sym,offs
301ec016b0 _start+0x0 ffffffff81467612 irq_return+0x0
301ec016b0 _start+0x0 ffffffff81467612 irq_return+0x0
301ec04b70 _dl_start+0x0 301ec016b3 _start+0x3
301ec04b70 _dl_start+0x0 ffffffff81467612 irq_return+0x0
301ec04b96 _dl_start+0x26 ffffffff81467612 irq_return+0x0
301ec04b9d _dl_start+0x2d ffffffff81467612 irq_return+0x0
301ec04c0d _dl_start+0x9d 301ec04beb _dl_start+0x7b
301ec04bf0 _dl_start+0x80 301ec04c11 _dl_start+0xa1
[snip]
Changes in v2:
- change the way to output offset from '--show-symbol-offset' to
'offs' field.
- clean up codes.

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/Documentation/perf-script.txt | 2 +-
tools/perf/builtin-script.c | 20 +++++++++++++++++---
tools/perf/util/session.c | 7 +++++--
tools/perf/util/session.h | 2 +-
tools/perf/util/symbol.c | 22 +++++++++++++++-------
tools/perf/util/symbol.h | 2 ++
6 files changed, 41 insertions(+), 14 deletions(-)
diff --git a/tools/perf/Documentation/perf-script.txt b/tools/perf/Documentation/perf-script.txt
index 2f6cef4..477638a 100644
--- a/tools/perf/Documentation/perf-script.txt
+++ b/tools/perf/Documentation/perf-script.txt
@@ -115,7 +115,7 @@ OPTIONS
-f::
--fields::
Comma separated list of fields to print. Options are:
- comm, tid, pid, time, cpu, event, trace, ip, sym, dso, addr.
+ comm, tid, pid, time, cpu, event, trace, ip, sym, dso, addr, offs.
Field list can be prepended with the type, trace, sw or hw,
to indicate to which event type the field list applies.
e.g., -f sw:comm,tid,time,ip,sym and -f trace:time,cpu,trace
diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c
index 360a4da..e79ec7d 100644
--- a/tools/perf/builtin-script.c
+++ b/tools/perf/builtin-script.c
@@ -40,6 +40,7 @@ enum perf_output_field {
PERF_OUTPUT_SYM = 1U << 8,
PERF_OUTPUT_DSO = 1U << 9,
PERF_OUTPUT_ADDR = 1U << 10,
+ PERF_OUTPUT_OFFSET = 1U << 11,
};

struct output_option {
@@ -57,6 +58,7 @@ struct output_option {
{.str = "sym", .field = PERF_OUTPUT_SYM},
{.str = "dso", .field = PERF_OUTPUT_DSO},
{.str = "addr", .field = PERF_OUTPUT_ADDR},
+ {.str = "offs", .field = PERF_OUTPUT_OFFSET},
};

/* default set to maintain compatibility with current format */
@@ -193,6 +195,11 @@ static int perf_evsel__check_attr(struct perf_evsel *evsel,
"to symbols.\n");
return -EINVAL;
}
+ if (PRINT_FIELD(OFFSET) && !PRINT_FIELD(SYM)) {
+ pr_err("Display of offsets requested but symbol is not"
+ "selected.\n");
+ return -EINVAL;
+ }
if (PRINT_FIELD(DSO) && !PRINT_FIELD(IP) && !PRINT_FIELD(ADDR)) {
pr_err("Display of DSO requested but neither sample IP nor "
"sample address\nis selected. Hence, no addresses to convert "
@@ -349,7 +356,10 @@ static void print_sample_addr(union perf_event *event,

if (PRINT_FIELD(SYM)) {
printf(" ");
- symbol__print_symname(al.sym);
+ if (PRINT_FIELD(OFFSET))
+ symbol__print_symname_offs(al.sym, &al);
+ else
+ symbol__print_symname(al.sym);
}

if (PRINT_FIELD(DSO)) {
@@ -385,7 +395,8 @@ static void process_event(union perf_event *event __unused,
else
printf("\n");
perf_event__print_ip(event, sample, machine, evsel,
- PRINT_FIELD(SYM), PRINT_FIELD(DSO));
+ PRINT_FIELD(SYM), PRINT_FIELD(DSO),
+ PRINT_FIELD(OFFSET));
}

printf("\n");
@@ -1095,7 +1106,10 @@ static const struct option options[] = {
OPT_STRING(0, "symfs", &symbol_conf.symfs, "directory",
"Look for files with symbols relative to this directory"),
OPT_CALLBACK('f', "fields", NULL, "str",
- "comma separated output fields prepend with 'type:'. Valid types: hw,sw,trace,raw. Fields: comm,tid,pid,time,cpu,event,trace,ip,sym,dso,addr",
+ "comma separated output fields prepend with 'type:'. "
+ "Valid types: hw,sw,trace,raw. "
+ "Fields: comm,tid,pid,time,cpu,event,trace,ip,sym,dso,"
+ "addr,offs",
parse_output_fields),
OPT_BOOLEAN('a', "all-cpus", &system_wide,
"system-wide collection from all CPUs"),
diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index aad26b3..c4d1e8b 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -1293,7 +1293,7 @@ struct perf_evsel *perf_session__find_first_evtype(struct perf_session *session,

void perf_event__print_ip(union perf_event *event, struct perf_sample *sample,
struct machine *machine, struct perf_evsel *evsel,
- int print_sym, int print_dso)
+ int print_sym, int print_dso, int print_offset)
{
struct addr_location al;
struct callchain_cursor *cursor = &evsel->hists.callchain_cursor;
@@ -1340,7 +1340,10 @@ void perf_event__print_ip(union perf_event *event, struct perf_sample *sample,
printf("%16" PRIx64, sample->ip);
if (print_sym) {
printf(" ");
- symbol__print_symname(al.sym);
+ if (print_offset)
+ symbol__print_symname_offs(al.sym, &al);
+ else
+ symbol__print_symname(al.sym);
}

if (print_dso) {
diff --git a/tools/perf/util/session.h b/tools/perf/util/session.h
index 37bc383..12b98bf 100644
--- a/tools/perf/util/session.h
+++ b/tools/perf/util/session.h
@@ -147,7 +147,7 @@ struct perf_evsel *perf_session__find_first_evtype(struct perf_session *session,

void perf_event__print_ip(union perf_event *event, struct perf_sample *sample,
struct machine *machine, struct perf_evsel *evsel,
- int print_sym, int print_dso);
+ int print_sym, int print_dso, int print_offset);

int perf_session__cpu_bitmap(struct perf_session *session,
const char *cpu_list, unsigned long *cpu_bitmap);
diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
index 7d1fb3a..4056d36 100644
--- a/tools/perf/util/symbol.c
+++ b/tools/perf/util/symbol.c
@@ -264,16 +264,24 @@ static size_t symbol__fprintf(struct symbol *sym, FILE *fp)
sym->name);
}

-void symbol__print_symname(const struct symbol *sym)
+void symbol__print_symname_offs(const struct symbol *sym,
+ const struct addr_location *al)
{
- const char *symname;
+ unsigned long offset;

- if (sym && sym->name)
- symname = sym->name;
- else
- symname = "[unknown]";
+ if (sym && sym->name) {
+ printf("%s", sym->name);
+ if (al) {
+ offset = al->addr - sym->start;
+ printf("+0x%lx", offset);
+ }
+ } else
+ printf("[unknown]");
+}

- printf("%s", symname);
+void symbol__print_symname(const struct symbol *sym)
+{
+ symbol__print_symname_offs(sym, NULL);
}

void dso__set_long_name(struct dso *dso, char *name)
diff --git a/tools/perf/util/symbol.h b/tools/perf/util/symbol.h
index 26be235..280f477 100644
--- a/tools/perf/util/symbol.h
+++ b/tools/perf/util/symbol.h
@@ -241,6 +241,8 @@ void machines__destroy_guest_kernel_maps(struct rb_root *machines);

int symbol__init(void);
void symbol__exit(void);
+void symbol__print_symname_offs(const struct symbol *sym,
+ const struct addr_location *al);
void symbol__print_symname(const struct symbol *sym);
bool symbol_type__is_a(char symbol_type, enum map_type map_type);



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