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// 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 <pthread.h>
#include <time.h>
#include "gtest/gtest.h"
#include "absl/time/clock.h"
#include "absl/time/time.h"
#include "benchmark/benchmark.h"
namespace gvisor {
namespace testing {
namespace {
void BM_ClockGettimeThreadCPUTime(benchmark::State& state) {
clockid_t clockid;
ASSERT_EQ(0, pthread_getcpuclockid(pthread_self(), &clockid));
struct timespec tp;
for (auto _ : state) {
clock_gettime(clockid, &tp);
}
}
BENCHMARK(BM_ClockGettimeThreadCPUTime);
void BM_VDSOClockGettime(benchmark::State& state) {
const clockid_t clock = state.range(0);
struct timespec tp;
absl::Time start = absl::Now();
// Don't benchmark the calibration phase.
while (absl::Now() < start + absl::Milliseconds(2100)) {
clock_gettime(clock, &tp);
}
for (auto _ : state) {
clock_gettime(clock, &tp);
}
}
BENCHMARK(BM_VDSOClockGettime)->Arg(CLOCK_MONOTONIC)->Arg(CLOCK_REALTIME);
} // namespace
} // namespace testing
} // namespace gvisor
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