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authorArnaldo Carvalho de Melo <acme@redhat.com>2020-08-31 16:17:00 -0300
committerArnaldo Carvalho de Melo <acme@redhat.com>2020-09-01 12:15:52 -0300
commitd4ccbacb9c217fefb4332a9af81b785690cf1053 (patch)
treecc1704d78a97aac0ac6c21f2ff08365b02dbecae
parent33321a06c70b44dd391b4cc01568a20d53fb3a6e (diff)
perf top/report: Fix infinite loop in the TUI for grouped events
For a while we need to have a dummy event for doing things like receiving PERF_RECORD_COMM, PERF_RECORD_EXEC, etc for threads being created and dying while we synthesize the pre-existing ones at tool start. This 'dummy' event is needed for keeping track of thread lifetime events early in the session but are uninteresting otherwise, i.e. no need to have it in a initial events menu for the non-grouped case, i.e. for: # perf top -e cycles,instructions or even for plain: # perf top When 'cycles' and that 'dummy' event are in place. The code to remove that 'dummy' event ended up creating an endless loop for the grouped case, i.e.: # perf top -e '{cycles,instructions}' Fix it. Fixes: bee9ca1c8a237ca1 ("perf report TUI: Remove needless 'dummy' event from menu") Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Ian Rogers <irogers@google.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
-rw-r--r--tools/perf/ui/browsers/hists.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/tools/perf/ui/browsers/hists.c b/tools/perf/ui/browsers/hists.c
index be9c4c0549bc..a07626f07208 100644
--- a/tools/perf/ui/browsers/hists.c
+++ b/tools/perf/ui/browsers/hists.c
@@ -3629,8 +3629,8 @@ int perf_evlist__tui_browse_hists(struct evlist *evlist, const char *help,
{
int nr_entries = evlist->core.nr_entries;
-single_entry:
if (perf_evlist__single_entry(evlist)) {
+single_entry: {
struct evsel *first = evlist__first(evlist);
return perf_evsel__hists_browse(first, nr_entries, help,
@@ -3638,6 +3638,7 @@ single_entry:
env, warn_lost_event,
annotation_opts);
}
+ }
if (symbol_conf.event_group) {
struct evsel *pos;