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 13:43:20 +0100
From:   Jiri Olsa <jolsa@...hat.com>
To:     "Jin, Yao" <yao.jin@...ux.intel.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 Thu, Dec 19, 2019 at 08:38:39PM +0800, Jin, Yao wrote:
> 
> 
> 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.

sure, I don't have any more comments

jirka