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authorJiri Olsa <jolsa@kernel.org>2014-06-02 13:44:23 -0400
committerJiri Olsa <jolsa@kernel.org>2014-06-03 21:35:05 +0200
commita515114fa3cff8f1da10cd68914d55c10879c3e0 (patch)
treeaeb310420822d6a7ca0ec2bf7d8d5dae80588f54 /tools/perf
parentf29984226978313039d7dfe9b45eaa55a3aad03d (diff)
downloadop-kernel-dev-a515114fa3cff8f1da10cd68914d55c10879c3e0.zip
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perf record: Fix poll return value propagation
If the perf record command is interrupted in record__mmap_read_all function, the 'done' is set and err has the latest poll return value, which is most likely positive number (= number of pollfds ready to read). This 'positive err' is then propagated to the exit code, resulting in not finishing the perf.data header properly, causing following error in report: # perf record -F 50000 -a --- make the system real busy, so there's more chance to interrupt perf in event writing code --- ^C[ perf record: Woken up 16 times to write data ] [ perf record: Captured and wrote 30.292 MB perf.data (~1323468 samples) ] # perf report --stdio > /dev/null WARNING: The perf.data file's data size field is 0 which is unexpected. Was the 'perf record' command properly terminated? Fixing this by checking for positive poll return value and setting err to 0. Acked-by: Arnaldo Carvalho de Melo <acme@redhat.com> Acked-by: Namhyung Kim <namhyung@kernel.org> Cc: Arnaldo Carvalho de Melo <acme@kernel.org> Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com> Cc: David Ahern <dsahern@gmail.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/1401732126-19465-1-git-send-email-jolsa@kernel.org Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Diffstat (limited to 'tools/perf')
-rw-r--r--tools/perf/builtin-record.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index e4c85b8..ce2cfec 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -454,7 +454,11 @@ static int __cmd_record(struct record *rec, int argc, const char **argv)
if (done)
break;
err = poll(rec->evlist->pollfd, rec->evlist->nr_fds, -1);
- if (err < 0 && errno == EINTR)
+ /*
+ * Propagate error, only if there's any. Ignore positive
+ * number of returned events and interrupt error.
+ */
+ if (err > 0 || (err < 0 && errno == EINTR))
err = 0;
waking++;
}
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