perf top: Add --percent-limit option

The --percent-limit option is for not showing small overhead entries in
the output.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Acked-by: Pekka Enberg <penberg@kernel.org>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/1368497347-9628-8-git-send-email-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 14 insertions, 2 deletions

diff --git a/tools/perf/ui/browsers/hists.c b/tools/perf/ui/browsers/hists.c
index 9dfde61505cc..fc0bd3843d34 100644
--- a/tools/perf/ui/browsers/hists.c
+++ b/tools/perf/ui/browsers/hists.c
@@ -310,6 +310,8 @@ static void ui_browser__warn_lost_events(struct ui_browser *browser)
                 "Or reduce the sampling frequency.");
 }
 
+static void hist_browser__update_pcnt_entries(struct hist_browser *hb);
+
 static int hist_browser__run(struct hist_browser *browser, const char *ev_name,
                              struct hist_browser_timer *hbt)
 {
@@ -333,9 +335,18 @@ static int hist_browser__run(struct hist_browser *browser, const char *ev_name,
                 key = ui_browser__run(&browser->b, delay_secs);
 
                 switch (key) {
-                case K_TIMER:
+                case K_TIMER: {
+                        u64 nr_entries;
                         hbt->timer(hbt->arg);
-                        ui_browser__update_nr_entries(&browser->b, browser->hists->nr_entries);
+
+                        if (browser->min_pcnt) {
+                                hist_browser__update_pcnt_entries(browser);
+                                nr_entries = browser->nr_pcnt_entries;
+                        } else {
+                                nr_entries = browser->hists->nr_entries;
+                        }
+
+                        ui_browser__update_nr_entries(&browser->b, nr_entries);
 
                         if (browser->hists->stats.nr_lost_warned !=
                             browser->hists->stats.nr_events[PERF_RECORD_LOST]) {
@@ -347,6 +358,7 @@ static int hist_browser__run(struct hist_browser *browser, const char *ev_name,
                         hists__browser_title(browser->hists, title, sizeof(title), ev_name);
                         ui_browser__show_title(&browser->b, title);
                         continue;
+                }
                 case 'D': { /* Debug */
                         static int seq;
                         struct hist_entry *h = rb_entry(browser->b.top,