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