github.com/SagerNet/gvisor@v0.0.0-20210707092255-7731c139d75c/test/perf/linux/gettid_benchmark.cc (about) 1 // Copyright 2020 The gVisor Authors. 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // http://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 15 #include <sys/syscall.h> 16 #include <sys/types.h> 17 #include <unistd.h> 18 19 #include "gtest/gtest.h" 20 #include "benchmark/benchmark.h" 21 22 namespace gvisor { 23 namespace testing { 24 25 namespace { 26 27 void BM_Gettid(benchmark::State& state) { 28 for (auto _ : state) { 29 syscall(SYS_gettid); 30 } 31 } 32 33 BENCHMARK(BM_Gettid)->ThreadRange(1, 4000)->UseRealTime(); 34 35 } // namespace 36 37 } // namespace testing 38 } // namespace gvisor