linux-kernel - RE: [PATCH V3 11/12] perf top: switch default mode to overwrite mode

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Date:   Thu, 11 Jan 2018 21:30:36 +0000
From:   "Liang, Kan" <kan.liang@...el.com>
To:     Jiri Olsa <jolsa@...hat.com>
CC:     "acme@...nel.org" <acme@...nel.org>,
        "peterz@...radead.org" <peterz@...radead.org>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "wangnan0@...wei.com" <wangnan0@...wei.com>,
        "jolsa@...nel.org" <jolsa@...nel.org>,
        "namhyung@...nel.org" <namhyung@...nel.org>,
        "ak@...ux.intel.com" <ak@...ux.intel.com>,
        "yao.jin@...ux.intel.com" <yao.jin@...ux.intel.com>
Subject: RE: [PATCH V3 11/12] perf top: switch default mode to overwrite mode


 
> SNIP
> 
> >  		.max_stack	     = sysctl_perf_event_max_stack,
> >  		.sym_pcnt_filter     = 5,
> > diff --git a/tools/perf/ui/browsers/hists.c b/tools/perf/ui/browsers/hists.c
> > index 68146f4..56023e4 100644
> > --- a/tools/perf/ui/browsers/hists.c
> > +++ b/tools/perf/ui/browsers/hists.c
> > @@ -638,8 +638,13 @@ int hist_browser__run(struct hist_browser
> *browser, const char *help)
> >  			nr_entries = hist_browser__nr_entries(browser);
> >  			ui_browser__update_nr_entries(&browser->b,
> nr_entries);
> >
> > -			if (browser->hists->stats.nr_lost_warned !=
> > -			    browser->hists-
> >stats.nr_events[PERF_RECORD_LOST]) {
> > +			/*
> > +			 * Don't print lost events warning for perf top,
> > +			 * because it is overwrite mode.
> > +			 * Perf top is the only tool which has hbt timer.
> > +			 */
> 
> I hate that warning, but still should it be ommited only for overwrite case?
> also please separate this change from the rest of the patch

Sure.
Will do it.

Thanks,
Kan

> 
> jirka
> 
> > +			if ((browser->hists->stats.nr_lost_warned !=
> > +			    browser->hists-
> >stats.nr_events[PERF_RECORD_LOST]) && !hbt) {
> >  				browser->hists->stats.nr_lost_warned =
> >  					browser->hists-
> >stats.nr_events[PERF_RECORD_LOST];
> >  				ui_browser__warn_lost_events(&browser-
> >b);
> > @@ -3203,7 +3208,8 @@ static int perf_evsel_menu__run(struct
> perf_evsel_menu *menu,
> >  		case K_TIMER:
> >  			hbt->timer(hbt->arg);
> >
> > -			if (!menu->lost_events_warned && menu-
> >lost_events) {
> > +			if (!menu->lost_events_warned &&
> > +			    menu->lost_events && !hbt) {
> >  				ui_browser__warn_lost_events(&menu->b);
> >  				menu->lost_events_warned = true;
> >  			}
> > --
> > 2.5.5
> >