linux-kernel - Re: [PATCH v3 3/5] perf report: Sort by sampled cycles percent per block for stdio

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Date:   Wed, 23 Oct 2019 21:11:42 +0800
From:   "Jin, Yao" <yao.jin@...ux.intel.com>
To:     Jiri Olsa <jolsa@...hat.com>
Cc:     acme@...nel.org, jolsa@...nel.org, peterz@...radead.org,
        mingo@...hat.com, alexander.shishkin@...ux.intel.com,
        Linux-kernel@...r.kernel.org, ak@...ux.intel.com,
        kan.liang@...el.com, yao.jin@...el.com
Subject: Re: [PATCH v3 3/5] perf report: Sort by sampled cycles percent per
 block for stdio



On 10/23/2019 7:36 PM, Jiri Olsa wrote:
> On Tue, Oct 22, 2019 at 04:07:08PM +0800, Jin Yao wrote:
> 
> SNIP
> 
>> diff --git a/tools/perf/util/sort.c b/tools/perf/util/sort.c
>> index 43d1d410854a..eb286700a8a9 100644
>> --- a/tools/perf/util/sort.c
>> +++ b/tools/perf/util/sort.c
>> @@ -492,6 +492,10 @@ struct sort_entry sort_sym_ipc_null = {
>>   	.se_width_idx	= HISTC_SYMBOL_IPC,
>>   };
>>   
>> +struct sort_entry sort_block_cycles = {
>> +	.se_cmp		= sort__sym_cmp,
>> +};
> 
> so this is here only for you to be able to write '-s total_cycles'
> and has no other functonality right?
> 

Yes, that's right.

> I think we'd be better with report boolean option instad, like
> 'perf report --total-cycles', because your code does the column
> display by itself.. and we could get rid of this -s confusion
> 

Yes, I agree. Thanks for this suggestion!

Thanks
Jin Yao

> jirka
>