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Date: Thu, 30 Jun 2011 13:44:29 +0900
From: Akihiro Nagai <akihiro.nagai.hw@...achi.com>
To: David Ahern <dsahern@...il.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 3/4] perf script: add the option to show the offset
of symbols
(2011/06/28 23:55), David Ahern wrote:
> On 06/28/2011 08:52 AM, David Ahern wrote:
>> On 06/28/2011 01:40 AM, Akihiro Nagai wrote:
>>> Add the option '--show-symbol-offset' to show the offset from
>>> the symbols in the output of perf-script. We can get the more
>>> detailed address information.
>>
>> I like the offset option; added that locally last week as well. more below.
>
> one more comment: move the --show-symbol-offset option to a field
> parameter - like ip, addr, dso and sym. For parameter checking make it
> depend on the sym field.
>
> Update the Documentation file as well.
OK, I'm going to add 'offs' field specifier instead of
the option '--show-symbol-offset', and update documents.
>
> David
>
>>
>>>
>>> Output sample:
>>> # perf script -f ip,addr,sym --show-symbol-offset
>>> 301ec016b0 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]
>>>
>>> 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 | 3 +++
>>> tools/perf/builtin-script.c | 20 ++++++++++++++------
>>> tools/perf/util/session.c | 16 ++++++++++------
>>> tools/perf/util/session.h | 3 ++-
>>> 4 files changed, 29 insertions(+), 13 deletions(-)
>>>
>>> diff --git a/tools/perf/Documentation/perf-script.txt b/tools/perf/Documentation/perf-script.txt
>>> index c6068cb..39c4721 100644
>>> --- a/tools/perf/Documentation/perf-script.txt
>>> +++ b/tools/perf/Documentation/perf-script.txt
>>> @@ -182,6 +182,9 @@ OPTIONS
>>> --hide-call-graph::
>>> When printing symbols do not display call chain.
>>>
>>> +--show-symbol-offset::
>>> + Show the offset of the symbols.
>>> +
>>> SEE ALSO
>>> --------
>>> linkperf:perf-record[1], linkperf:perf-script-perl[1],
>>> diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c
>>> index 2d68086..f9b7047 100644
>>> --- a/tools/perf/builtin-script.c
>>> +++ b/tools/perf/builtin-script.c
>>> @@ -21,6 +21,7 @@ static u64 last_timestamp;
>>> static u64 nr_unordered;
>>> extern const struct option record_options[];
>>> static bool no_callchain;
>>> +static bool show_symbol_offset;
>>>
>>> enum perf_output_field {
>>> PERF_OUTPUT_COMM = 1U<< 0,
>>> @@ -324,6 +325,7 @@ 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;
>>> + unsigned long offset;
>>>
>>> printf("%16" PRIx64, sample->addr);
>>>
>>> @@ -346,12 +348,15 @@ 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)
>>> + printf(" ");
>>> + if (al.sym&& al.sym->name) {
>>> symname = al.sym->name;
>>> - else
>>> - symname = "";
>>
>> dropping the else path will cause columns to misalign when ip's do not
>> resolve.
I see.
I'd like to add a magic word that indicates perf-script failed to resolve the symbol.
For example, '[unknown]'.
>>
>>> -
>>> - printf(" %16s", symname);
>>> + offset = al.addr - al.sym->start;
>>
>> move the offset calculation under the if (show_symbol_offset)
OK.
>>
>>> + if (show_symbol_offset)
>>> + printf("%16s+0x%lx", symname, offset);
>>> + else
>>> + printf("%16s", symname);
>>> + }
>>> }
>>>
>>> if (PRINT_FIELD(DSO)) {
>>> @@ -390,7 +395,8 @@ 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),
>>> + show_symbol_offset);
>>> }
>>>
>>> printf("\n");
>>> @@ -1084,6 +1090,8 @@ static const struct option options[] = {
>>> 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",
>>> parse_output_fields),
>>> + OPT_BOOLEAN('\0', "show-symbol-offset",&show_symbol_offset,
>>> + "Show the offset of the symbol."),
>>>
>>> OPT_END()
>>> };
>>> diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
>>> index 632266f..bb522ed 100644
>>> --- a/tools/perf/util/session.c
>>> +++ b/tools/perf/util/session.c
>>> @@ -1205,10 +1205,11 @@ 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;
>>> const char *symname, *dsoname;
>>> + unsigned long offset;
>>> struct callchain_cursor *cursor =&session->callchain_cursor;
>>> struct callchain_cursor_node *node;
>>>
>>> @@ -1259,12 +1260,15 @@ void perf_session__print_ip(union perf_event *event,
>>> } else {
>>> printf("%16" PRIx64, sample->ip);
>>> if (print_sym) {
>>> - if (al.sym&& al.sym->name)
>>> + printf(" ");
>>> + if (al.sym&& al.sym->name) {
>>> symname = al.sym->name;
>>> - else
>>> - symname = "";
>>> -
>>> - printf(" %s", symname);
>>> + offset = al.addr - al.sym->start;
>>> + if (print_offset)
>>> + printf("%s+0x%lx", symname, offset);
>>
>> same comments for this code path.
OK. I'm going to move the code.
Thank you.
>>
>> David
>>
>>
>>> + else
>>> + printf("%s", symname);
>>> + }
>>> }
>>>
>>> if (print_dso) {
>>> diff --git a/tools/perf/util/session.h b/tools/perf/util/session.h
>>> index de4178d..8187e68 100644
>>> --- a/tools/perf/util/session.h
>>> +++ b/tools/perf/util/session.h
>>> @@ -170,6 +170,7 @@ 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);
>>>
>>> #endif /* __PERF_SESSION_H */
>>>
--
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