path: root/tools/perf/util/ui/browser.c
diff options
authorArnaldo Carvalho de Melo <acme@redhat.com>2011-10-11 16:15:39 -0300
committerArnaldo Carvalho de Melo <acme@redhat.com>2011-10-11 16:16:54 -0300
commit900e14a8f5a49e987790b93c7906989b22075f1b (patch)
tree384fefd278474a1e03ccc68efbf7ea92e393ee6f /tools/perf/util/ui/browser.c
parentMerge branch 'perf/core' of git://github.com/acmel/linux into perf/core (diff)
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>
Diffstat (limited to 'tools/perf/util/ui/browser.c')
1 files changed, 23 insertions, 0 deletions
diff --git a/tools/perf/util/ui/browser.c b/tools/perf/util/ui/browser.c
index 611219f80680..5911bba63858 100644
--- a/tools/perf/util/ui/browser.c
+++ b/tools/perf/util/ui/browser.c
@@ -230,6 +230,29 @@ int ui_browser__refresh(struct ui_browser *self)
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;