Merge branch 'master' into iptables

1 files changed, 59 insertions, 0 deletions

diff --git a/test/perf/linux/signal_benchmark.cc b/test/perf/linux/signal_benchmark.cc
new file mode 100644
index 000000000..a6928df58
--- /dev/null
+++ b/test/perf/linux/signal_benchmark.cc
@@ -0,0 +1,59 @@
+// Copyright 2020 The gVisor Authors.
+//
+// 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.
+
+#include <signal.h>
+#include <string.h>
+
+#include "gtest/gtest.h"
+#include "benchmark/benchmark.h"
+#include "test/util/logging.h"
+#include "test/util/test_util.h"
+
+namespace gvisor {
+namespace testing {
+
+namespace {
+
+void FixupHandler(int sig, siginfo_t* si, void* void_ctx) {
+  static unsigned int dataval = 0;
+
+  // Skip the offending instruction.
+  ucontext_t* ctx = reinterpret_cast<ucontext_t*>(void_ctx);
+  ctx->uc_mcontext.gregs[REG_RAX] = reinterpret_cast<greg_t>(&dataval);
+}
+
+void BM_FaultSignalFixup(benchmark::State& state) {
+  // Set up the signal handler.
+  struct sigaction sa = {};
+  sigemptyset(&sa.sa_mask);
+  sa.sa_sigaction = FixupHandler;
+  sa.sa_flags = SA_SIGINFO;
+  TEST_CHECK(sigaction(SIGSEGV, &sa, nullptr) == 0);
+
+  // Fault, fault, fault.
+  for (auto _ : state) {
+    register volatile unsigned int* ptr asm("rax");
+
+    // Trigger the segfault.
+    ptr = nullptr;
+    *ptr = 0;
+  }
+}
+
+BENCHMARK(BM_FaultSignalFixup)->UseRealTime();
+
+}  // namespace
+
+}  // namespace testing
+}  // namespace gvisor