linux-kernel - Re: [RFC v3 02/17] perf kwork: Add irq kwork record support

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Date:   Thu, 28 Jul 2022 19:50:44 +0800
From:   Yang Jihong <yangjihong1@...wei.com>
To:     Namhyung Kim <namhyung@...nel.org>
CC:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>, "Paul Clarke" <pc@...ibm.com>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-perf-users <linux-perf-users@...r.kernel.org>
Subject: Re: [RFC v3 02/17] perf kwork: Add irq kwork record support

Hello Namhyung,

On 2022/7/28 7:42, Namhyung Kim wrote:
> On Fri, Jul 8, 2022 at 6:53 PM Yang Jihong <yangjihong1@...wei.com> wrote:
>>
>> Record interrupt events irq:irq_handler_entry & irq_handler_exit
>>
>> Test cases:
>>
>>   # perf kwork record -o perf_kwork.date -- sleep 1
>>    [ perf record: Woken up 0 times to write data ]
>>    [ perf record: Captured and wrote 0.556 MB perf_kwork.date ]
>>    #
>>    # perf evlist -i perf_kwork.date
>>    irq:irq_handler_entry
>>    irq:irq_handler_exit
>>    dummy:HG
>>    # Tip: use 'perf evlist --trace-fields' to show fields for tracepoint events
>>    #
>>
>> Signed-off-by: Yang Jihong <yangjihong1@...wei.com>
>> ---
>>   tools/perf/Documentation/perf-kwork.txt |  2 +-
>>   tools/perf/builtin-kwork.c              | 15 ++++++++++++++-
>>   tools/perf/util/kwork.h                 |  1 +
>>   3 files changed, 16 insertions(+), 2 deletions(-)
>>
>> diff --git a/tools/perf/Documentation/perf-kwork.txt b/tools/perf/Documentation/perf-kwork.txt
>> index dc1e36da57bb..57bd5fa7d5c9 100644
>> --- a/tools/perf/Documentation/perf-kwork.txt
>> +++ b/tools/perf/Documentation/perf-kwork.txt
>> @@ -32,7 +32,7 @@ OPTIONS
>>
>>   -k::
>>   --kwork::
>> -       List of kwork to profile
>> +       List of kwork to profile (irq, etc)
>>
>>   -v::
>>   --verbose::
>> diff --git a/tools/perf/builtin-kwork.c b/tools/perf/builtin-kwork.c
>> index f3552c56ede3..a26b7fde1e38 100644
>> --- a/tools/perf/builtin-kwork.c
>> +++ b/tools/perf/builtin-kwork.c
>> @@ -25,7 +25,20 @@
>>   #include <linux/time64.h>
>>   #include <linux/zalloc.h>
>>
>> +const struct evsel_str_handler irq_tp_handlers[] = {
>> +       { "irq:irq_handler_entry", NULL, },
>> +       { "irq:irq_handler_exit",  NULL, },
>> +};
>> +
>> +static struct kwork_class kwork_irq = {
>> +       .name           = "irq",
>> +       .type           = KWORK_CLASS_IRQ,
>> +       .nr_tracepoints = 2,
> 
> Nit: I don't think it's gonna change frequently but
> it'd be better to use ARRAY_SIZE(irq_tp_handlers)
> for future changes.
> 
OK, I'll fix in next patch,thanks for your review.

Regards,
Jihong