perf top/tui: Update nr_entries properly after a filter is applied

The hist_browser__reset() is only called right after a filter is
applied so it needs to udpate browser->nr_entries properly.  We cannot
use hists->nr_non_filtered_entreis directly since it's possible that
such entries are also filtered out by minimum percentage limit.

In addition when a filter is used for perf top, hist browser's
nr_entries field was not updated after applying the filter.  But it
needs to be updated as new samples are coming.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Link: http://lkml.kernel.org/r/1398327843-31845-11-git-send-email-namhyung@kernel.org
Signed-off-by: Jiri Olsa <jolsa@kernel.org>

1 files changed, 16 insertions, 4 deletions

diff --git a/tools/perf/ui/browsers/hists.c b/tools/perf/ui/browsers/hists.c
index 769295bf2c10..886eee0062e0 100644
--- a/tools/perf/ui/browsers/hists.c
+++ b/tools/perf/ui/browsers/hists.c
@@ -35,6 +35,11 @@ static int hists__browser_title(struct hists *hists, char *bf, size_t size,
                                 const char *ev_name);
 static void hist_browser__update_nr_entries(struct hist_browser *hb);
 
+static bool hist_browser__has_filter(struct hist_browser *hb)
+{
+        return hists__has_filter(hb->hists) || hb->min_pcnt;
+}
+
 static void hist_browser__refresh_dimensions(struct hist_browser *browser)
 {
         /* 3 == +/- toggle symbol before actual hist_entry rendering */
@@ -44,7 +49,8 @@ static void hist_browser__refresh_dimensions(struct hist_browser *browser)
 
 static void hist_browser__reset(struct hist_browser *browser)
 {
-        browser->b.nr_entries = browser->hists->nr_entries;
+        hist_browser__update_nr_entries(browser);
+        browser->b.nr_entries = browser->nr_non_filtered_entries;
         hist_browser__refresh_dimensions(browser);
         ui_browser__reset_index(&browser->b);
 }
@@ -319,9 +325,10 @@ static int hist_browser__run(struct hist_browser *browser, const char *ev_name,
         int delay_secs = hbt ? hbt->refresh : 0;
 
         browser->b.entries = &browser->hists->entries;
-        browser->b.nr_entries = browser->hists->nr_entries;
-        if (browser->min_pcnt)
+        if (hist_browser__has_filter(browser))
                 browser->b.nr_entries = browser->nr_non_filtered_entries;
+        else
+                browser->b.nr_entries = browser->hists->nr_entries;
 
         hist_browser__refresh_dimensions(browser);
         hists__browser_title(browser->hists, title, sizeof(title), ev_name);
@@ -338,7 +345,7 @@ static int hist_browser__run(struct hist_browser *browser, const char *ev_name,
                         u64 nr_entries;
                         hbt->timer(hbt->arg);
 
-                        if (browser->min_pcnt) {
+                        if (hist_browser__has_filter(browser)) {
                                 hist_browser__update_nr_entries(browser);
                                 nr_entries = browser->nr_non_filtered_entries;
                         } else {
@@ -1347,6 +1354,11 @@ static void hist_browser__update_nr_entries(struct hist_browser *hb)
         u64 nr_entries = 0;
         struct rb_node *nd = rb_first(&hb->hists->entries);
 
+        if (hb->min_pcnt == 0) {
+                hb->nr_non_filtered_entries = hb->hists->nr_non_filtered_entries;
+                return;
+        }
+
         while ((nd = hists__filter_entries(nd, hb->hists,
                                            hb->min_pcnt)) != NULL) {
                 nr_entries++;