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>

1 files changed, 55 insertions, 0 deletions

diff --git a/tools/perf/ui/browsers/hists.c b/tools/perf/ui/browsers/hists.c
index 3a1e0965a8fd..a5a5390476ac 100644
--- 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 '?':