4.20-stable review patch. If anyone has any objections, please let me know.
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[ Upstream commit a389aece97938966616ce0336466b98b0351ef10 ]
Ondřej reported that when compiled with python3, the python extension regresses in evlist.get_pollfd function behaviour.
The evlist.get_pollfd function creates file objects from evlist's fds and returns them in a list. The python3 version also sets them to 'close the original descriptor' when the object dies (is closed), by passing True via the 'closefd' arg in the PyFile_FromFd call.
The python's closefd doc says:
If closefd is False, the underlying file descriptor will be kept open when the file is closed.
That's why the following line in python3 closes all evlist fds:
evlist.get_pollfd()
the returned list is immediately destroyed and that takes down the original events fds.
Passing closefd as False to PyFile_FromFd to fix this.
Reported-by: Ondřej Lysoněk olysonek@redhat.com Signed-off-by: Jiri Olsa jolsa@kernel.org Cc: Alexander Shishkin alexander.shishkin@linux.intel.com Cc: Jaroslav Škarvada jskarvad@redhat.com Cc: Namhyung Kim namhyung@kernel.org Cc: Peter Zijlstra peterz@infradead.org Fixes: 66dfdff03d19 ("perf tools: Add Python 3 support") Link: http://lkml.kernel.org/r/20181226112121.5285-1-jolsa@kernel.org Signed-off-by: Arnaldo Carvalho de Melo acme@redhat.com Signed-off-by: Sasha Levin sashal@kernel.org --- tools/perf/util/python.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/tools/perf/util/python.c b/tools/perf/util/python.c index 50150dfc0cdf..4dd8fd05a260 100644 --- a/tools/perf/util/python.c +++ b/tools/perf/util/python.c @@ -939,7 +939,8 @@ static PyObject *pyrf_evlist__get_pollfd(struct pyrf_evlist *pevlist,
file = PyFile_FromFile(fp, "perf", "r", NULL); #else - file = PyFile_FromFd(evlist->pollfd.entries[i].fd, "perf", "r", -1, NULL, NULL, NULL, 1); + file = PyFile_FromFd(evlist->pollfd.entries[i].fd, "perf", "r", -1, + NULL, NULL, NULL, 0); #endif if (file == NULL) goto free_list;