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Message-ID: <e0d999a0-312c-04fe-30ed-08e172804a6f@huawei.com>
Date: Mon, 15 May 2023 17:23:43 +0800
From: Yang Jihong <yangjihong1@...wei.com>
To: Adrian Hunter <adrian.hunter@...el.com>, <peterz@...radead.org>,
<mingo@...hat.com>, <acme@...nel.org>, <mark.rutland@....com>,
<alexander.shishkin@...ux.intel.com>, <jolsa@...nel.org>,
<namhyung@...nel.org>, <irogers@...gle.com>,
<anshuman.khandual@....com>, <jesussanp@...gle.com>,
<linux-perf-users@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 3/4] perf tools: Add printing perf_event_attr type
symbol in perf_event_attr__fprintf()
Hello,
On 2023/5/15 16:56, Adrian Hunter wrote:
> On 15/05/23 11:48, Yang Jihong wrote:
>> Hello,
>>
>> On 2023/5/12 18:34, Adrian Hunter wrote:
>>> On 11/05/23 10:51, Yang Jihong wrote:
>>>> When printing perf_event_attr, always display perf_event_attr type and its symbol
>>>> to improve the readability of debugging information.
>>>>
>>>> Before:
>>>>
>>>> # perf --debug verbose=2 record -e cycles,cpu-clock,sched:sched_switch,branch-load-misses,r101,mem:0x0 -C 0 true
>>>> <SNIP>
>>>> ------------------------------------------------------------
>>>> perf_event_attr:
>>>> size 136
>>>> { sample_period, sample_freq } 4000
>>>> sample_type IP|TID|TIME|CPU|PERIOD|IDENTIFIER
>>>> read_format ID
>>>> disabled 1
>>>> inherit 1
>>>> freq 1
>>>> sample_id_all 1
>>>> exclude_guest 1
>>>> ------------------------------------------------------------
>>>> sys_perf_event_open: pid -1 cpu 0 group_fd -1 flags 0x8 = 5
>>>> ------------------------------------------------------------
>>>> perf_event_attr:
>>>> type 1
>>>> size 136
>>>> { sample_period, sample_freq } 4000
>>>> sample_type IP|TID|TIME|CPU|PERIOD|IDENTIFIER
>>>> read_format ID
>>>> disabled 1
>>>> inherit 1
>>>> freq 1
>>>> sample_id_all 1
>>>> exclude_guest 1
>>>> ------------------------------------------------------------
>>>> sys_perf_event_open: pid -1 cpu 0 group_fd -1 flags 0x8 = 6
>>>> ------------------------------------------------------------
>>>> perf_event_attr:
>>>> type 2
>>>> size 136
>>>> config 0x143
>>>> { sample_period, sample_freq } 1
>>>> sample_type IP|TID|TIME|CPU|PERIOD|RAW|IDENTIFIER
>>>> read_format ID
>>>> disabled 1
>>>> inherit 1
>>>> sample_id_all 1
>>>> exclude_guest 1
>>>> ------------------------------------------------------------
>>>> sys_perf_event_open: pid -1 cpu 0 group_fd -1 flags 0x8 = 7
>>>> ------------------------------------------------------------
>>>> perf_event_attr:
>>>> type 3
>>>> size 136
>>>> config 0x10005
>>>> { sample_period, sample_freq } 4000
>>>> sample_type IP|TID|TIME|CPU|PERIOD|IDENTIFIER
>>>> read_format ID
>>>> disabled 1
>>>> inherit 1
>>>> freq 1
>>>> sample_id_all 1
>>>> exclude_guest 1
>>>> ------------------------------------------------------------
>>>> sys_perf_event_open: pid -1 cpu 0 group_fd -1 flags 0x8 = 9
>>>> ------------------------------------------------------------
>>>> perf_event_attr:
>>>> type 4
>>>> size 136
>>>> config 0x101
>>>> { sample_period, sample_freq } 4000
>>>> sample_type IP|TID|TIME|CPU|PERIOD|IDENTIFIER
>>>> read_format ID
>>>> disabled 1
>>>> inherit 1
>>>> freq 1
>>>> sample_id_all 1
>>>> exclude_guest 1
>>>> ------------------------------------------------------------
>>>> sys_perf_event_open: pid -1 cpu 0 group_fd -1 flags 0x8 = 10
>>>> ------------------------------------------------------------
>>>> perf_event_attr:
>>>> type 5
>>>> size 136
>>>> { sample_period, sample_freq } 1
>>>> sample_type IP|TID|TIME|CPU|IDENTIFIER
>>>> read_format ID
>>>> disabled 1
>>>> inherit 1
>>>> sample_id_all 1
>>>> exclude_guest 1
>>>> bp_type 3
>>>> { bp_len, config2 } 0x4
>>>> ------------------------------------------------------------
>>>> <SNIP>
>>>>
>>>> After:
>>>>
>>>> # perf --debug verbose=2 record -e cycles,cpu-clock,sched:sched_switch,branch-load-misses,r101,mem:0x0 -C 0 true
>>>> <SNIP>
>>>> ------------------------------------------------------------
>>>> perf_event_attr:
>>>> type 0 (PERF_TYPE_HARDWARE)
>>>> size 136
>>>> { sample_period, sample_freq } 4000
>>>> sample_type IP|TID|TIME|CPU|PERIOD|IDENTIFIER
>>>> read_format ID
>>>> disabled 1
>>>> inherit 1
>>>> freq 1
>>>> sample_id_all 1
>>>> exclude_guest 1
>>>> ------------------------------------------------------------
>>>> sys_perf_event_open: pid -1 cpu 0 group_fd -1 flags 0x8 = 5
>>>> ------------------------------------------------------------
>>>> perf_event_attr:
>>>> type 1 (PERF_TYPE_SOFTWARE)
>>>> size 136
>>>> { sample_period, sample_freq } 4000
>>>> sample_type IP|TID|TIME|CPU|PERIOD|IDENTIFIER
>>>> read_format ID
>>>> disabled 1
>>>> inherit 1
>>>> freq 1
>>>> sample_id_all 1
>>>> exclude_guest 1
>>>> ------------------------------------------------------------
>>>> sys_perf_event_open: pid -1 cpu 0 group_fd -1 flags 0x8 = 6
>>>> ------------------------------------------------------------
>>>> perf_event_attr:
>>>> type 2 (PERF_TYPE_TRACEPOINT)
>>>> size 136
>>>> config 0x143
>>>> { sample_period, sample_freq } 1
>>>> sample_type IP|TID|TIME|CPU|PERIOD|RAW|IDENTIFIER
>>>> read_format ID
>>>> disabled 1
>>>> inherit 1
>>>> sample_id_all 1
>>>> exclude_guest 1
>>>> ------------------------------------------------------------
>>>> sys_perf_event_open: pid -1 cpu 0 group_fd -1 flags 0x8 = 7
>>>> ------------------------------------------------------------
>>>> perf_event_attr:
>>>> type 3 (PERF_TYPE_HW_CACHE)
>>>> size 136
>>>> config 0x10005
>>>> { sample_period, sample_freq } 4000
>>>> sample_type IP|TID|TIME|CPU|PERIOD|IDENTIFIER
>>>> read_format ID
>>>> disabled 1
>>>> inherit 1
>>>> freq 1
>>>> sample_id_all 1
>>>> exclude_guest 1
>>>> ------------------------------------------------------------
>>>> sys_perf_event_open: pid -1 cpu 0 group_fd -1 flags 0x8 = 9
>>>> ------------------------------------------------------------
>>>> perf_event_attr:
>>>> type 4 (PERF_TYPE_RAW)
>>>> size 136
>>>> config 0x101
>>>> { sample_period, sample_freq } 4000
>>>> sample_type IP|TID|TIME|CPU|PERIOD|IDENTIFIER
>>>> read_format ID
>>>> disabled 1
>>>> inherit 1
>>>> freq 1
>>>> sample_id_all 1
>>>> exclude_guest 1
>>>> ------------------------------------------------------------
>>>> sys_perf_event_open: pid -1 cpu 0 group_fd -1 flags 0x8 = 10
>>>> ------------------------------------------------------------
>>>> perf_event_attr:
>>>> type 5 (PERF_TYPE_BREAKPOINT)
>>>> size 136
>>>> { sample_period, sample_freq } 1
>>>> sample_type IP|TID|TIME|CPU|IDENTIFIER
>>>> read_format ID
>>>> disabled 1
>>>> inherit 1
>>>> sample_id_all 1
>>>> exclude_guest 1
>>>> bp_type 3
>>>> { bp_len, config2 } 0x4
>>>> ------------------------------------------------------------
>>>> <SNIP>
>>>>
>>>> Signed-off-by: Yang Jihong <yangjihong1@...wei.com>
>>>> ---
>>>> tools/perf/util/perf_event_attr_fprintf.c | 30 ++++++++++++++++++++++-
>>>> 1 file changed, 29 insertions(+), 1 deletion(-)
>>>>
>>>> diff --git a/tools/perf/util/perf_event_attr_fprintf.c b/tools/perf/util/perf_event_attr_fprintf.c
>>>> index 433029c6afc5..cd0905d8cb7a 100644
>>>> --- a/tools/perf/util/perf_event_attr_fprintf.c
>>>> +++ b/tools/perf/util/perf_event_attr_fprintf.c
>>>> @@ -71,6 +71,33 @@ static void __p_read_format(char *buf, size_t size, u64 value)
>>>> __p_bits(buf, size, value, bits);
>>>> }
>>>> +#define ENUM_ID_TO_STR_CASE(x) case x: return (#x);
>>>> +static const char *stringify_perf_type_id(u64 value)
>>>> +{
>>>> + /* sync with enum perf_type_id in perf_event.h */
>>>
>>> Everything in this file syncs with perf_event.h, so the comment
>>> does not seem very useful.
>> OK, will fix in v3.
>>>
>>>> + switch (value) {
>>>> + ENUM_ID_TO_STR_CASE(PERF_TYPE_HARDWARE)
>>>> + ENUM_ID_TO_STR_CASE(PERF_TYPE_SOFTWARE)
>>>> + ENUM_ID_TO_STR_CASE(PERF_TYPE_TRACEPOINT)
>>>> + ENUM_ID_TO_STR_CASE(PERF_TYPE_HW_CACHE)
>>>> + ENUM_ID_TO_STR_CASE(PERF_TYPE_RAW)
>>>> + ENUM_ID_TO_STR_CASE(PERF_TYPE_BREAKPOINT)
>>>> + default:
>>>> + return NULL;
>>>> + }
>>>> +}
>>>> +#undef ENUM_ID_TO_STR_CASE
>>>> +
>>>> +static void __p_type_id(char *buf, size_t size, u64 value)
>>>> +{
>>>> + const char *str = stringify_perf_type_id(value);
>>>> +
>>>> + if (str == NULL)
>>>> + snprintf(buf, size, "%"PRIu64, value);
>>>> + else
>>>> + snprintf(buf, size, "%"PRIu64" (%s)", value, str);
>>>
>>> These 4 lines end up getting used again about 3 times in the next
>>> patch, so might as well be a separate function e.g.
>>>
>>> print_id(buf, size, value, stringify_perf_type_id(value));
>>>
>>> where:
>>>
>>> static void print_id(char *buf, size_t size, u64 value, const char *str)
>>> {
>>> if (str == NULL)
>>> snprintf(buf, size, "%"PRIu64, value);
>>> else
>>> snprintf(buf, size, "%"PRIu64" (%s)", value, str);
>>> }
>>>
>> OK, will add print_id() helper in v3.
>> If print_id() helper is also used to print config id, is printed in the decimal format. In the past, it is printed in the hexadecimal format，
>> there may be some changes here.
>>
>> Before:
>> config 0x143
>>
>> After:
>> config 323 (sched:sched_switch)
>
> Right I didn't notice the difference. Best keep print_id() just for the hex cases.
>
Emm...，Is the type id also printed in hexadecimal format?
static void print_id(char *buf, size_t size, u64 value, const char *str)
{
if (str == NULL)
snprintf(buf, size, "%#"PRIx64, value);
else
snprintf(buf, size, "%#"PRIx64" (%s)", value, str);
}
Output:
perf_event_attr:
type 0x2 (PERF_TYPE_TRACEPOINT)
size 136
config 0x124 (sched:sched_switch)
Because v3 has just been sent out, if need to modify it according to
this, I'll send v4.
Thanks,
Yang
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