linux-kernel - Re: [PATCH v6 1/4] perf report: Fix incorrectly added dimensions as switch perf data file

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Date:   Mon, 23 Dec 2019 08:55:00 +0800
From:   "Jin, Yao" <yao.jin@...ux.intel.com>
To:     Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>
Cc:     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 v6 1/4] perf report: Fix incorrectly added dimensions as
 switch perf data file



On 12/21/2019 12:34 AM, Arnaldo Carvalho de Melo wrote:
> Em Fri, Dec 20, 2019 at 09:37:19AM +0800, Jin Yao escreveu:
>> We observed an issue that was some extra columns displayed after switching
>> perf data file in browser. The steps to reproduce:
>>
>> 1. perf record -a -e cycles,instructions -- sleep 3
>> 2. perf report --group
>> 3. In browser, we use hotkey 's' to switch to another perf.data
>> 4. Now in browser, the extra columns 'Self' and 'Children' are displayed.
>>
>> The issue is setup_sorting() executed again after repeat path, so dimensions
>> are added again.
>>
>> This patch checks the last key returned from __cmd_report(). If it's
>> K_SWITCH_INPUT_DATA, skips the setup_sorting().
> 
> you forgot to add this right?
> 
> Cc: Feng Tang <feng.tang@...el.com>
> Fixes: ad0de0971b7f ("perf report: Enable the runtime switching of perf data file")
>   

Yes, I should add this in patch description. Thanks for reminding

Do you need me to resend this patch-set (v7)?

Thanks
Jin Yao

>>   v6:
>>   ---
>>   No change.
>>
>>   v5:
>>   ---
>>   New patch in v5.
>>
>> Signed-off-by: Jin Yao <yao.jin@...ux.intel.com>
>> ---
>>   tools/perf/builtin-report.c | 5 ++++-
>>   1 file changed, 4 insertions(+), 1 deletion(-)
>>
>> diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
>> index 387311c67264..de988589d99b 100644
>> --- a/tools/perf/builtin-report.c
>> +++ b/tools/perf/builtin-report.c
>> @@ -1076,6 +1076,7 @@ int cmd_report(int argc, const char **argv)
>>   	struct stat st;
>>   	bool has_br_stack = false;
>>   	int branch_mode = -1;
>> +	int last_key = 0;
>>   	bool branch_call_mode = false;
>>   #define CALLCHAIN_DEFAULT_OPT  "graph,0.5,caller,function,percent"
>>   	static const char report_callchain_help[] = "Display call graph (stack chain/backtrace):\n\n"
>> @@ -1450,7 +1451,8 @@ int cmd_report(int argc, const char **argv)
>>   		sort_order = sort_tmp;
>>   	}
>>   
>> -	if (setup_sorting(session->evlist) < 0) {
>> +	if ((last_key != K_SWITCH_INPUT_DATA) &&
>> +	    (setup_sorting(session->evlist) < 0)) {
>>   		if (sort_order)
>>   			parse_options_usage(report_usage, options, "s", 1);
>>   		if (field_order)
>> @@ -1530,6 +1532,7 @@ int cmd_report(int argc, const char **argv)
>>   	ret = __cmd_report(&report);
>>   	if (ret == K_SWITCH_INPUT_DATA) {
>>   		perf_session__delete(session);
>> +		last_key = K_SWITCH_INPUT_DATA;
>>   		goto repeat;
>>   	} else
>>   		ret = 0;
>> -- 
>> 2.17.1
>