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Message-ID: <4E52536F.40609@gmail.com>
Date: Mon, 22 Aug 2011 07:02:39 -0600
From: David Ahern <dsahern@...il.com>
To: Akihiro Nagai <akihiro.nagai.hw@...achi.com>
CC: Arnaldo Carvalho de Melo <acme@...radead.org>,
Ingo Molnar <mingo@...e.hu>,
Peter Zijlstra <peterz@...radead.org>,
Frederic Weisbecker <fweisbec@...il.com>,
linux-kernel@...r.kernel.org,
Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
yrl.pp-manager.tt@...achi.com, Paul Mackerras <paulus@...ba.org>
Subject: Re: [PATCH -tip v3 4/5] perf script: add the offset field specifier
On 08/11/2011 06:06 AM, Akihiro Nagai wrote:
> 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@...achi.com>
> Cc: Peter Zijlstra <peterz@...radead.org>
> Cc: Frederic Weisbecker <fweisbec@...il.com>
> Cc: Paul Mackerras <paulus@...ba.org>
> Cc: Ingo Molnar <mingo@...e.hu>
> Cc: Arnaldo Carvalho de Melo <acme@...radead.org>
> Cc: David Ahern <dsahern@...il.com>
> Cc: Masami Hiramatsu <masami.hiramatsu.pt@...achi.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 | 3 ++-
> tools/perf/util/symbol.c | 22 +++++++++++++++-------
> tools/perf/util/symbol.h | 2 ++
> 6 files changed, 42 insertions(+), 14 deletions(-)
>
> diff --git a/tools/perf/Documentation/perf-script.txt b/tools/perf/Documentation/perf-script.txt
> index db01786..ee4d477 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 aeec5bc..78797b3 100644
> --- a/tools/perf/builtin-script.c
> +++ b/tools/perf/builtin-script.c
> @@ -37,6 +37,7 @@ 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 {
> @@ -54,6 +55,7 @@ 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 */
> @@ -190,6 +192,11 @@ 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 "
> @@ -346,7 +353,10 @@ 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)) {
> @@ -382,7 +392,8 @@ static void process_event(union perf_event *event __unused,
> else
> printf("\n");
> perf_session__print_ip(event, sample, session,
> - PRINT_FIELD(SYM), PRINT_FIELD(DSO));
> + PRINT_FIELD(SYM), PRINT_FIELD(DSO),
> + PRINT_FIELD(OFFSET));
> }
>
> printf("\n");
> @@ -1078,7 +1089,10 @@ 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_STRING('c', "cpu", &cpu_list, "cpu", "list of cpus to profile"),
>
> diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
> index 730fcd2..51d0a28 100644
> --- a/tools/perf/util/session.c
> +++ b/tools/perf/util/session.c
> @@ -1217,7 +1217,7 @@ struct perf_evsel *perf_session__find_first_evtype(struct perf_session *session,
> void perf_session__print_ip(union perf_event *event,
> struct perf_sample *sample,
> struct perf_session *session,
> - int print_sym, int print_dso)
> + int print_sym, int print_dso, int print_offset)
> {
> struct addr_location al;
> struct callchain_cursor *cursor = &session->callchain_cursor;
> @@ -1264,7 +1264,10 @@ void perf_session__print_ip(union perf_event *event,
> 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 170601e..2689017 100644
> --- a/tools/perf/util/session.h
> +++ b/tools/perf/util/session.h
> @@ -171,7 +171,8 @@ struct perf_evsel *perf_session__find_first_evtype(struct perf_session *session,
> void perf_session__print_ip(union perf_event *event,
> struct perf_sample *sample,
> struct perf_session *session,
> - 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 aa37485..28e14be 100644
> --- a/tools/perf/util/symbol.c
> +++ b/tools/perf/util/symbol.c
> @@ -175,16 +175,24 @@ 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 1ec17b4..554b2fe 100644
> --- a/tools/perf/util/symbol.h
> +++ b/tools/perf/util/symbol.h
> @@ -238,6 +238,8 @@ 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);
>
>
Acked-By: David Ahern <dsahern@...il.com>
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