[PATCH 1/2] perf test lock_contention.sh: Skip test if the number of CPUs is low

[vmolnaro@redhat.com]

From: notValord <v.m.veverka@gmail.com>

Machines with less then 4 CPUs weren't consistently triggering lock
events required for the test.

Skip the test on those machines. The limit of 4 CPUs is set as it
generates around 100 lock events for a test.
---
 tools/perf/tests/shell/lock_contention.sh | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/tools/perf/tests/shell/lock_contention.sh b/tools/perf/tests/shell/lock_contention.sh
index f2cc187b618..1d3598ff6a0 100755
--- a/tools/perf/tests/shell/lock_contention.sh
+++ b/tools/perf/tests/shell/lock_contention.sh
@@ -31,6 +31,12 @@ check() {
 		echo "[Skip] No lock contention tracepoints"
 		err=2
 		exit
+	fi 
+
+	if [ `nproc` -lt 4 ]; then
+		echo "[Skip] Low number of CPUs (`nproc`), lock event cannot be triggered certainly"
+		err=2
+		exit
 	fi
 }
 
-- 
2.41.0