linux-kernel - Re: [PATCH v2 0/7] perf ctf: Convert comm, fork and exit events to CTF

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Date:	Fri, 24 Jun 2016 20:43:56 +0800
From:	pi3orama <pi3orama@....com>
To:	Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:	Jiri Olsa <jolsa@...hat.com>, Wang Nan <wangnan0@...wei.com>,
	linux-kernel@...r.kernel.org, lizefan@...wei.com
Subject: Re: [PATCH v2 0/7] perf ctf: Convert comm, fork and exit events to CTF



发自我的 iPhone

> 在 2016年6月24日，下午8:41，Arnaldo Carvalho de Melo <acme@...nel.org> 写道：
> 
> Em Fri, Jun 24, 2016 at 02:29:07PM +0200, Jiri Olsa escreveu:
>> On Fri, Jun 24, 2016 at 11:22:05AM +0000, Wang Nan wrote:
>>> After converting perf.data to CTF, we lost pid-tid-comm mapping. Which
>>> makes inconvience. For example, in perf script output we know which
>>> process issue an event like this:
>>> 
>>> compiz 19361 [001] 3275709.313929:  raw_syscalls:sys_exit: NR 7 = 0
>>> 
>>> After converting to CTF, we only get this:
>>> 
>>>  [3275709.313929985] (+0.110646118) raw_syscalls:sys_exit: { cpu_id = 1 }, { perf_ip = 0xFFFFFFFF8107B2E8, perf_tid = 19361, perf_pid = 19361, perf_id = 18920, perf_period = 1, common_type = 16, common_flags = 0, common_preempt_count = 1, common_pid = 19361, id = 7, ret = 0 }
>>> 
>>> Currently, if we want to find the name and parent of a process, we
>>> have to collect 'sched:sched_switch' event.
>>> 
>>> This patch set adds a '--all' option to 'perf convert', converts comm,
>>> fork and exit events to CTF output. CTF user now can track the mapping
>>> by their own.
>>> 
>>> v1 -> v2: Report number of sample and non-sample events when finish.
>>>          rename opts.non_sample to opts.all.
>>> 
>>> Wang Nan (7):
>>>  perf ctf: Add value_set_string() helper
>>>  perf ctf: Pass convert options through opts structure
>>>  perf ctf: Add 'all' option
>>>  perf ctf: Prepare collect non-sample events
>>>  perf ctf: Generate comm event to CTF output
>>>  perf ctf: Add '--all' option for 'perf data convert'
>>>  perf ctf: Generate fork and exit events to CTF output
>> 
>> I can't compile unless I can include config.h
> 
> Waiting for this fix to proceed, but it seems we don't have this covered
> in 'build-test', right? ;-)
> 

CTF support is off by default. When can we
turn it on like other options?

Thank you.

> - Arnaldo
> 
>> [jolsa@...va perf]$ make LIBBABELTRACE_DIR=/opt/libbabeltrace/ LIBBABELTRACE=1
>>  BUILD:   Doing 'make -j4' parallel build
>>  CC       util/data-convert-bt.o
>> util/data-convert-bt.c: In function ‘convert__config’:
>> util/data-convert-bt.c:1299:19: error: implicit declaration of function ‘perf_config_u64’ [-Werror=implicit-function-declaration]
>>   c->queue_size = perf_config_u64(var, value);
>>                   ^
>> util/data-convert-bt.c:1299:3: error: nested extern declaration of ‘perf_config_u64’ [-Werror=nested-externs]
>>   c->queue_size = perf_config_u64(var, value);
>>   ^
>> util/data-convert-bt.c: In function ‘bt_convert__perf2ctf’:
>> util/data-convert-bt.c:1332:2: error: implicit declaration of function ‘perf_config’ [-Werror=implicit-function-declaration]
>>  perf_config(convert__config, &c);
>>  ^
>> util/data-convert-bt.c:1332:2: error: nested extern declaration of ‘perf_config’ [-Werror=nested-externs]
>> cc1: all warnings being treated as errors
>> 
>> 
>> your compiler's not that strict I guess ;-)
>> I'll post it shortly
>> 
>> jirka
>> 
>> ---
>> diff --git a/tools/perf/util/data-convert-bt.c b/tools/perf/util/data-convert-bt.c
>> index 79082782e7d2..4b68e7b9ee0c 100644
>> --- a/tools/perf/util/data-convert-bt.c
>> +++ b/tools/perf/util/data-convert-bt.c
>> @@ -26,6 +26,7 @@
>> #include "evlist.h"
>> #include "evsel.h"
>> #include "machine.h"
>> +#include "config.h"
>> 
>> #define pr_N(n, fmt, ...) \
>>    eprintf(n, debug_data_convert, fmt, ##__VA_ARGS__)