perf hist: Clarify events_stats fields usage

The events_stats.total field is too generic, rename it to .total_period,
and also add a comment explaining that it is the sum of all the .period
fields in samples, that is needed because we use auto-freq to avoid
sampling artifacts.

Ditto for events_stats.lost, that is the sum of all lost_event.lost
fields, i.e. the number of events the kernel dropped.

Looking at the users, builtin-sched.c can make use of these fields and
stop doing it again.

Cc: Frédéric Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Tom Zanussi <tzanussi@gmail.com>
LKML-Reference: <new-submission>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 3 insertions, 3 deletions

diff --git a/tools/perf/util/newt.c b/tools/perf/util/newt.c
index ba6acd04c082..010bacf40163 100644
--- a/tools/perf/util/newt.c
+++ b/tools/perf/util/newt.c
@@ -689,7 +689,7 @@ static int hist_browser__populate(struct hist_browser *self, struct hists *hists
         }
 
         snprintf(str, sizeof(str), "Samples: %Ld                            ",
-                 hists->stats.total);
+                 hists->stats.total_period);
         newtDrawRootText(0, 0, str);
 
         newtGetScreenSize(NULL, &rows);
@@ -718,12 +718,12 @@ static int hist_browser__populate(struct hist_browser *self, struct hists *hists
                 if (h->filtered)
                         continue;
 
-                len = hist_entry__append_browser(h, self->tree, hists->stats.total);
+                len = hist_entry__append_browser(h, self->tree, hists->stats.total_period);
                 if (len > max_len)
                         max_len = len;
                 if (symbol_conf.use_callchain)
                         hist_entry__append_callchain_browser(h, self->tree,
-                                                             hists->stats.total, idx++);
+                                                             hists->stats.total_period, idx++);
                 ++curr_hist;
                 if (curr_hist % 5)
                         ui_progress__update(progress, curr_hist);