perf hists browser: Add 'L' hotkey to change percent limit

Add 'L' key action to change the percent limit applied to both of hist
entries and callchains.

Suggested-by: Arnaldo Carvalho de Melo <acme@kernel.org>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/r/1454508683-5735-4-git-send-email-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/ui/browsers/hists.c b/tools/perf/ui/browsers/hists.c
index 3a1e0965a8fdde52abb14474a8e8f095dac9ef7b..a5a5390476acead8acd48575ad404a5198856073 100644 (file)
--- a/tools/perf/ui/browsers/hists.c
+++ b/tools/perf/ui/browsers/hists.c
@@ -2029,6 +2029,42 @@ static void hist_browser__update_nr_entries(struct hist_browser *hb)
        hb->nr_non_filtered_entries = nr_entries;
 }
 
+static void hist_browser__update_percent_limit(struct hist_browser *hb,
+                                              double percent)
+{
+       struct hist_entry *he;
+       struct rb_node *nd = rb_first(&hb->hists->entries);
+       u64 total = hists__total_period(hb->hists);
+       u64 min_callchain_hits = total * (percent / 100);
+
+       hb->min_pcnt = callchain_param.min_percent = percent;
+
+       if (!symbol_conf.use_callchain)
+               return;
+
+       while ((nd = hists__filter_entries(nd, hb->min_pcnt)) != NULL) {
+               he = rb_entry(nd, struct hist_entry, rb_node);
+
+               if (callchain_param.mode == CHAIN_GRAPH_REL) {
+                       total = he->stat.period;
+
+                       if (symbol_conf.cumulate_callchain)
+                               total = he->stat_acc->period;
+
+                       min_callchain_hits = total * (percent / 100);
+               }
+
+               callchain_param.sort(&he->sorted_chain, he->callchain,
+                                    min_callchain_hits, &callchain_param);
+
+               /* force to re-evaluate folding state of callchains */
+               he->init_have_children = false;
+               hist_entry__set_folding(he, false);
+
+               nd = rb_next(nd);
+       }
+}
+
 static int perf_evsel__hists_browse(struct perf_evsel *evsel, int nr_events,
                                    const char *helpline,
                                    bool left_exits,
@@ -2064,6 +2100,7 @@ static int perf_evsel__hists_browse(struct perf_evsel *evsel, int nr_events,
        "E             Expand all callchains\n"                         \
        "F             Toggle percentage of filtered entries\n"         \
        "H             Display column headers\n"                        \
+       "L             Change percent limit\n"                          \
        "m             Display context menu\n"                          \
        "S             Zoom into current Processor Socket\n"            \
 
@@ -2219,6 +2256,24 @@ static int perf_evsel__hists_browse(struct perf_evsel *evsel, int nr_events,
                                top->zero = !top->zero;
                        }
                        continue;
+               case 'L':
+                       if (ui_browser__input_window("Percent Limit",
+                                       "Please enter the value you want to hide entries under that percent.",
+                                       buf, "ENTER: OK, ESC: Cancel",
+                                       delay_secs * 2) == K_ENTER) {
+                               char *end;
+                               double new_percent = strtod(buf, &end);
+
+                               if (new_percent < 0 || new_percent > 100) {
+                                       ui_browser__warning(&browser->b, delay_secs * 2,
+                                               "Invalid percent: %.2f", new_percent);
+                                       continue;
+                               }
+
+                               hist_browser__update_percent_limit(browser, new_percent);
+                               hist_browser__reset(browser);
+                       }
+                       continue;
                case K_F1:
                case 'h':
                case '?':