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-rw-r--r--src/runtime/norace_test.go47
1 files changed, 47 insertions, 0 deletions
diff --git a/src/runtime/norace_test.go b/src/runtime/norace_test.go
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+++ b/src/runtime/norace_test.go
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+// Copyright 2013 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// The file contains tests that cannot run under race detector for some reason.
+//
+//go:build !race
+
+package runtime_test
+
+import (
+ "runtime"
+ "testing"
+)
+
+// Syscall tests split stack between Entersyscall and Exitsyscall under race detector.
+func BenchmarkSyscall(b *testing.B) {
+ benchmarkSyscall(b, 0, 1)
+}
+
+func BenchmarkSyscallWork(b *testing.B) {
+ benchmarkSyscall(b, 100, 1)
+}
+
+func BenchmarkSyscallExcess(b *testing.B) {
+ benchmarkSyscall(b, 0, 4)
+}
+
+func BenchmarkSyscallExcessWork(b *testing.B) {
+ benchmarkSyscall(b, 100, 4)
+}
+
+func benchmarkSyscall(b *testing.B, work, excess int) {
+ b.SetParallelism(excess)
+ b.RunParallel(func(pb *testing.PB) {
+ foo := 42
+ for pb.Next() {
+ runtime.Entersyscall()
+ for i := 0; i < work; i++ {
+ foo *= 2
+ foo /= 2
+ }
+ runtime.Exitsyscall()
+ }
+ _ = foo
+ })
+}