perf hists: Don't free decayed entries if in the annotation browser

Just let it there till the user exits the annotation browser.

Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/n/tip-nmaxuzreqhm5k10t2co5sk9a@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/util/hist.c b/tools/perf/util/hist.c
index 50c8fec..9b9d12b 100644 (file)
--- a/tools/perf/util/hist.c
+++ b/tools/perf/util/hist.c
@@ -100,6 +100,8 @@ static void hist_entry__decay(struct hist_entry *he)
 
 static bool hists__decay_entry(struct hists *hists, struct hist_entry *he)
 {
+       if (he->period == 0)
+               return true;
        hists->stats.total_period -= he->period;
        hist_entry__decay(he);
        hists->stats.total_period += he->period;
@@ -114,8 +116,12 @@ void hists__decay_entries(struct hists *hists)
        while (next) {
                n = rb_entry(next, struct hist_entry, rb_node);
                next = rb_next(&n->rb_node);
-
-               if (hists__decay_entry(hists, n)) {
+               /*
+                * We may be annotating this, for instance, so keep it here in
+                * case some it gets new samples, we'll eventually free it when
+                * the user stops browsing and it agains gets fully decayed.
+                */
+               if (hists__decay_entry(hists, n) && !n->used) {
                        rb_erase(&n->rb_node, &hists->entries);
 
                        if (sort__need_collapse)

diff --git a/tools/perf/util/sort.h b/tools/perf/util/sort.h
index 03851e3..3f67ae3 100644 (file)
--- a/tools/perf/util/sort.h
+++ b/tools/perf/util/sort.h
@@ -64,6 +64,7 @@ struct hist_entry {
 
        bool                    init_have_children;
        char                    level;
+       bool                    used;
        u8                      filtered;
        struct symbol           *parent;
        union {

diff --git a/tools/perf/util/ui/browsers/hists.c b/tools/perf/util/ui/browsers/hists.c
index 9ece843..fdc3c90 100644 (file)
--- a/tools/perf/util/ui/browsers/hists.c
+++ b/tools/perf/util/ui/browsers/hists.c
@@ -976,9 +976,13 @@ do_annotate:
                        he = hist_browser__selected_entry(browser);
                        if (he == NULL)
                                continue;
-
+                       /*
+                        * Don't let this be freed, say, by hists__decay_entry.
+                        */
+                       he->used = true;
                        hist_entry__tui_annotate(he, evsel->idx, nr_events,
                                                 timer, arg, delay_secs);
+                       he->used = false;
                        ui_browser__update_nr_entries(&browser->b, browser->hists->nr_entries);
                } else if (choice == browse_map)
                        map__browse(browser->selection->map);