linux-kernel - Re: [PATCH] perf script: Simplify auxiliary event printing functions

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Date:   Fri, 3 Apr 2020 13:31:07 +0300
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Jiri Olsa <jolsa@...hat.com>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] perf script: Simplify auxiliary event printing functions

On 3/04/20 1:01 pm, Jiri Olsa wrote:
> On Thu, Apr 02, 2020 at 05:15:48PM +0300, Adrian Hunter wrote:
>> This simplifies the print functions for the following perf script
>> options:
>>
>> 	--show-task-events
>> 	--show-namespace-events
>> 	--show-cgroup-events
>> 	--show-mmap-events
>> 	--show-switch-events
>> 	--show-lost-events
>> 	--show-bpf-events
>>
>> Example:
>> 	# perf record --switch-events -a -e cycles -c 10000 sleep 1
>>  Before:
>> 	# perf script --show-task-events --show-namespace-events --show-cgroup-events --show-mmap-events --show-switch-events --show-lost-events --show-bpf-events >out-before.txt
>>  After:
>> 	# perf script --show-task-events --show-namespace-events --show-cgroup-events --show-mmap-events --show-switch-events --show-lost-events --show-bpf-events >out-after.txt
>> 	# diff -s out-before.txt out-after.txt
>> 	Files out-before.txt and out-after.tx are identical
>>
>> Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
>> ---
>>  tools/perf/builtin-script.c | 304 ++++++++----------------------------
>>  1 file changed, 66 insertions(+), 238 deletions(-)
> 
> awesome ;-)
> 
>>
>> diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c
>> index 186ebf827fa1..348fec9743a4 100644
>> --- a/tools/perf/builtin-script.c
>> +++ b/tools/perf/builtin-script.c
>> @@ -2040,7 +2040,7 @@ static int cleanup_scripting(void)
>>  
>>  static bool filter_cpu(struct perf_sample *sample)
>>  {
>> -	if (cpu_list)
>> +	if (cpu_list && sample->cpu != (u32)-1)
>>  		return !test_bit(sample->cpu, cpu_bitmap);
> 
> why is this needed? filter_cpu seems to be already called
> from all the changed functions..

Yes, just paranoia