configs: GPUFS option to disable KVM perf counters (#433)

Add a --no-kvm-perf option to disable KVM perf counters for GPUFS
scripts. This is useful for users who have KVM enabled but configured
with more restrictive settings, which seems to be the default in newer
Linux distros.

Change-Id: I7508113d0f7c74deb21ea7b2770522885a0ec822

configs/example/gpufs/runfs.py

@@ -168,6 +168,13 @@ def addRunFSOptions(parser):
         "be disabled for correct functionality ",
     )
 
+    parser.add_argument(
+        "--no-kvm-perf",
+        default=False,
+        action="store_true",
+        help="Disable KVM perf counters (use this with LSF / ETX)",
+    )
+
 
 def runGpuFSSystem(args):
     """

configs/example/gpufs/system/system.py

@@ -296,6 +296,12 @@ def makeGpuFSSystem(args):
                 obj.eventq_index = 0
             cpu.eventq_index = i + 1
 
+    # Disable KVM Perf counters if specified. This is useful for machines
+    # with more restrictive KVM paranoid levels.
+    if args.no_kvm_perf and ObjectList.is_kvm_cpu(TestCPUClass):
+        for i, cpu in enumerate(system.cpu[:-1]):
+            cpu.usePerf = False
+
     gpu_port_idx = (
         len(system.ruby._cpu_ports)
         - args.num_compute_units