[PATCH] perf test record.sh: Raise limit of open file descriptors

[vmolnaro@redhat.com]

From: Veronika Molnarova <vmolnaro@redhat.com>

Subtest for system-wide record with '--threads' option fails due to a
limit of open file descriptors(usually set to 1024) on systems with
128 and more CPUs.

If the default limit is set lower than 2048 file descriptors,
temporarily raise it to this value for the test.

Signed-off-by: Veronika Molnarova <vmolnaro@redhat.com>
---
 tools/perf/tests/shell/record.sh | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/tools/perf/tests/shell/record.sh b/tools/perf/tests/shell/record.sh
index 4fbc74805d52..c6c43263809a 100755
--- a/tools/perf/tests/shell/record.sh
+++ b/tools/perf/tests/shell/record.sh
@@ -11,6 +11,8 @@ err=0
 perfdata=$(mktemp /tmp/__perf_test.perf.data.XXXXX)
 testprog="perf test -w thloop"
 testsym="test_loop"
+min_fd_limit=2048
+default_fd_limit=$(ulimit -n)
 
 cleanup() {
   rm -rf "${perfdata}"
@@ -154,10 +156,16 @@ test_workload() {
   echo "Basic target workload test [Success]"
 }
 
+if [[ $default_fd_limit -lt $min_fd_limit ]]; then
+	ulimit -n $min_fd_limit
+fi
+
 test_per_thread
 test_register_capture
 test_system_wide
 test_workload
 
+ulimit -n $default_fd_limit
+
 cleanup
 exit $err
-- 
2.41.0