perf hists browser: Recalculate browser pointers after resort/decay
In browsers that access dynamic underlying data structures, like in the
hists browser and its hist_entry rb_tree, we need to revalidate any
reference to the underlying data structure, because they can have gone
away, decayed.
This fixes a problem where after a while the top entries get behind the
top of the screen, i.e. the top_idx stays at 0, which means it is at the
first entry in the rb_tree when in fact it wasn't because the
browser->top didn't got revalidated after the timer ran and the
underlying data structure got updated.
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-mhje66qssdko24q67a2lhlho@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
diff --git a/tools/perf/util/ui/browser.c b/tools/perf/util/ui/browser.c
index 611219f..5911bba 100644
--- a/tools/perf/util/ui/browser.c
+++ b/tools/perf/util/ui/browser.c
@@ -230,6 +230,29 @@
return 0;
}
+/*
+ * Here we're updating nr_entries _after_ we started browsing, i.e. we have to
+ * forget about any reference to any entry in the underlying data structure,
+ * that is why we do a SEEK_SET. Think about 'perf top' in the hists browser
+ * after an output_resort and hist decay.
+ */
+void ui_browser__update_nr_entries(struct ui_browser *browser, u32 nr_entries)
+{
+ off_t offset = nr_entries - browser->nr_entries;
+
+ browser->nr_entries = nr_entries;
+
+ if (offset < 0) {
+ if (browser->top_idx < (u64)-offset)
+ offset = -browser->top_idx;
+
+ browser->index += offset;
+ browser->top_idx += offset;
+ }
+
+ browser->seek(browser, browser->top_idx, SEEK_SET);
+}
+
int ui_browser__run(struct ui_browser *self)
{
struct newtExitStruct es;
diff --git a/tools/perf/util/ui/browser.h b/tools/perf/util/ui/browser.h
index fc63dda..d42be43 100644
--- a/tools/perf/util/ui/browser.h
+++ b/tools/perf/util/ui/browser.h
@@ -41,6 +41,7 @@
void ui_browser__hide(struct ui_browser *self);
int ui_browser__refresh(struct ui_browser *self);
int ui_browser__run(struct ui_browser *self);
+void ui_browser__update_nr_entries(struct ui_browser *browser, u32 nr_entries);
void ui_browser__rb_tree_seek(struct ui_browser *self, off_t offset, int whence);
unsigned int ui_browser__rb_tree_refresh(struct ui_browser *self);
diff --git a/tools/perf/util/ui/browsers/hists.c b/tools/perf/util/ui/browsers/hists.c
index e64d952..9ece843 100644
--- a/tools/perf/util/ui/browsers/hists.c
+++ b/tools/perf/util/ui/browsers/hists.c
@@ -332,13 +332,7 @@
case -1:
/* FIXME we need to check if it was es.reason == NEWT_EXIT_TIMER */
timer(arg);
- /*
- * The timer may have changed the number of entries.
- * XXX: Find better way to keep this in synch, probably
- * removing this timer function altogether and just sync
- * using the hists->lock...
- */
- self->b.nr_entries = self->hists->nr_entries;
+ ui_browser__update_nr_entries(&self->b, self->hists->nr_entries);
hists__browser_title(self->hists, title, sizeof(title),
ev_name, self->dso_filter,
self->thread_filter);
@@ -985,6 +979,7 @@
hist_entry__tui_annotate(he, evsel->idx, nr_events,
timer, arg, delay_secs);
+ ui_browser__update_nr_entries(&browser->b, browser->hists->nr_entries);
} else if (choice == browse_map)
map__browse(browser->selection->map);
else if (choice == zoom_dso) {