The system_wide flag causes a selected event to be opened always without a pid. Consequently it will never get a POLLHUP, but it is used for tracking in combination with other events, so it should not need to be polled anyway. Therefore don't add it for polling.
Signed-off-by: Adrian Hunter <[email protected]> --- tools/perf/util/evlist.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c index 7e23dae..cfbe2b9 100644 --- a/tools/perf/util/evlist.c +++ b/tools/perf/util/evlist.c @@ -816,7 +816,15 @@ static int perf_evlist__mmap_per_evsel(struct perf_evlist *evlist, int idx, perf_evlist__mmap_get(evlist, idx); } - if (__perf_evlist__add_pollfd(evlist, fd, idx) < 0) { + /* + * The system_wide flag causes a selected event to be opened + * always without a pid. Consequently it will never get a + * POLLHUP, but it is used for tracking in combination with + * other events, so it should not need to be polled anyway. + * Therefore don't add it for polling. + */ + if (!evsel->system_wide && + __perf_evlist__add_pollfd(evlist, fd, idx) < 0) { perf_evlist__mmap_put(evlist, idx); return -1; } -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
