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authorArnaldo Carvalho de Melo <acme@redhat.com>2014-08-13 11:26:21 -0300
committerArnaldo Carvalho de Melo <acme@redhat.com>2014-09-25 16:46:54 -0300
commit8179672c2f7b9c41a7ef3e8c907d214fa92ed614 (patch)
tree5c9e46283b7521e331da545ae6994c6cc4407a7f
parent54dbfae3007b0c61727abba45af1e4c226908d82 (diff)
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>
-rw-r--r--tools/perf/util/evlist.c2
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++;
}