linux-kernel - Re: [PATCH v5 4/4] perf report: support hotkey to let user select any event for sorting

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Date:   Thu, 19 Dec 2019 20:38:39 +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 v5 4/4] perf report: support hotkey to let user select any
 event for sorting



On 12/19/2019 5:10 PM, Jiri Olsa wrote:
> On Thu, Dec 19, 2019 at 02:09:29PM +0800, Jin Yao wrote:
> 
> SNIP
> 
>> +		case '0' ... '9':
>> +			if (!symbol_conf.event_group ||
>> +			    evsel->core.nr_members < 2) {
>> +				snprintf(buf, sizeof(buf),
>> +					 "Sort by index only available with group events!");
>> +				helpline = buf;
>> +				continue;
>> +			}
>> +
>> +			symbol_conf.group_sort_idx = key - '0';
>> +
>> +			if (symbol_conf.group_sort_idx >= evsel->core.nr_members) {
>> +				snprintf(buf, sizeof(buf),
>> +					 "Max event group index to sort is %d (index from 0 to %d)",
>> +					 evsel->core.nr_members - 1,
>> +					 evsel->core.nr_members - 1);
>> +				helpline = buf;
>> +				continue;
>> +			}
>> +
>> +			key = K_RELOAD;
>> +			goto out_free_stack;
>>   		case 'a':
>>   			if (!hists__has(hists, sym)) {
>>   				ui_browser__warning(&browser->b, delay_secs * 2,
>> -- 
>> 2.17.1
>>
> 
> maybe also something like this to eliminate unneeded refresh?
> 
> jirka
> 
> 
> ---
> diff --git a/tools/perf/ui/browsers/hists.c b/tools/perf/ui/browsers/hists.c
> index 22e76bd1a2d9..9f5dd48500a2 100644
> --- a/tools/perf/ui/browsers/hists.c
> +++ b/tools/perf/ui/browsers/hists.c
> @@ -2947,6 +2947,9 @@ static int perf_evsel__hists_browse(struct evsel *evsel, int nr_events,
>   				continue;
>   			}
>   
> +			if (key - '0' == symbol_conf.group_sort_idx)
> +				continue;
> +
>   			symbol_conf.group_sort_idx = key - '0';
>   
>   			if (symbol_conf.group_sort_idx >= evsel->core.nr_members) {
> 

Hi Jiri,

Thanks, I think it's a good improvement. It can avoid the unnecessary 
refresh.

If no more comments on this patch-set, I will add this improvement and 
then post v6.

Thanks
Jin Yao