1 files changed, 55 insertions, 0 deletions
diff --git a/benchmarks/workloads/syscall/syscall.c b/benchmarks/workloads/syscall/syscall.c
new file mode 100644
index 000000000..ded030397
--- /dev/null
+++ b/benchmarks/workloads/syscall/syscall.c
@@ -0,0 +1,55 @@
+// Copyright 2019 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+
+//     http://www.apache.org/licenses/LICENSE-2.0
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#define _GNU_SOURCE
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/syscall.h>
+#include <sys/types.h>
+#include <time.h>
+#include <unistd.h>
+
+// Short program that calls getpid() a number of times and outputs time
+// diference from the MONOTONIC clock.
+int main(int argc, char** argv) {
+  struct timespec start, stop;
+  long result;
+  char buf[80];
+
+  if (argc < 2) {
+    printf("Usage:./syscall NUM_TIMES_TO_CALL");
+    return 1;
+  }
+
+  if (clock_gettime(CLOCK_MONOTONIC, &start)) return 1;
+
+  long loops = atoi(argv[1]);
+  for (long i = 0; i < loops; i++) {
+    syscall(SYS_gettimeofday, 0, 0);
+  }
+
+  if (clock_gettime(CLOCK_MONOTONIC, &stop)) return 1;
+
+  if ((stop.tv_nsec - start.tv_nsec) < 0) {
+    result = (stop.tv_sec - start.tv_sec - 1) * 1000;
+    result += (stop.tv_nsec - start.tv_nsec + 1000000000) / (1000 * 1000);
+  } else {
+    result = (stop.tv_sec - start.tv_sec) * 1000;
+    result += (stop.tv_nsec - start.tv_nsec) / (1000 * 1000);
+  }
+
+  printf("Called getpid syscall %d times: %lu ms, %lu ns each.\n", loops,
+         result, result * 1000000 / loops);
+
+  return 0;
+}