diff options
| author | Arnaldo Carvalho de Melo <acme@redhat.com> | 2014-08-13 18:26:21 +0400 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2014-09-25 23:46:54 +0400 |
| commit | 8179672c2f7b9c41a7ef3e8c907d214fa92ed614 (patch) | |
| tree | 5c9e46283b7521e331da545ae6994c6cc4407a7f /tools | |
| parent | 54dbfae3007b0c61727abba45af1e4c226908d82 (diff) | |
| download | linux-8179672c2f7b9c41a7ef3e8c907d214fa92ed614.tar.xz | |
perf evlist: Monitor POLLERR and POLLHUP events too
We want to know when the fd went away, like when a monitored thread
exits.
If we do not monitor such events, then the tools will wait forever on
events from a vanished thread, like when running:
$ sleep 5s &
$ perf record -p `pidof sleep`
This builds upon the kernel patch by Jiri Olsa that actually makes a
poll on those file descriptors to return POLLHUP.
It is also needed to change the tools to use
perf_evlist__filter_pollfd() to check if there are remainings fds to
monitor or if all are gone, in which case they will exit the
poll/mmap/read loop.
Acked-by: Jiri Olsa <jolsa@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Don Zickus <dzickus@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Namhyung Kim <namhyung@kernel.org>
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-a4fslwspov0bs69nj825hqpq@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools')
| -rw-r--r-- | tools/perf/util/evlist.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c index 023bc3873ae9..502cd11ab17e 100644 --- a/tools/perf/util/evlist.c +++ b/tools/perf/util/evlist.c @@ -424,7 +424,7 @@ void perf_evlist__add_pollfd(struct perf_evlist *evlist, int fd) { fcntl(fd, F_SETFL, O_NONBLOCK); evlist->pollfd[evlist->nr_fds].fd = fd; - evlist->pollfd[evlist->nr_fds].events = POLLIN; + evlist->pollfd[evlist->nr_fds].events = POLLIN | POLLERR | POLLHUP; evlist->nr_fds++; } |