1 files changed, 0 insertions, 198 deletions
diff --git a/test/perf/linux/futex_benchmark.cc b/test/perf/linux/futex_benchmark.cc
deleted file mode 100644
index e686041c9..000000000
--- a/test/perf/linux/futex_benchmark.cc
+++ /dev/null
@@ -1,198 +0,0 @@
-// 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 <linux/futex.h>
-
-#include <atomic>
-#include <cerrno>
-#include <cstdint>
-#include <cstdlib>
-#include <ctime>
-
-#include "gtest/gtest.h"
-#include "absl/time/clock.h"
-#include "absl/time/time.h"
-#include "benchmark/benchmark.h"
-#include "test/util/logging.h"
-#include "test/util/thread_util.h"
-
-namespace gvisor {
-namespace testing {
-
-namespace {
-
-inline int FutexWait(std::atomic<int32_t>* v, int32_t val) {
-  return syscall(SYS_futex, v, FUTEX_WAIT_PRIVATE, val, nullptr);
-}
-
-inline int FutexWaitMonotonicTimeout(std::atomic<int32_t>* v, int32_t val,
-                                     const struct timespec* timeout) {
-  return syscall(SYS_futex, v, FUTEX_WAIT_PRIVATE, val, timeout);
-}
-
-inline int FutexWaitMonotonicDeadline(std::atomic<int32_t>* v, int32_t val,
-                                      const struct timespec* deadline) {
-  return syscall(SYS_futex, v, FUTEX_WAIT_BITSET_PRIVATE, val, deadline,
-                 nullptr, FUTEX_BITSET_MATCH_ANY);
-}
-
-inline int FutexWaitRealtimeDeadline(std::atomic<int32_t>* v, int32_t val,
-                                     const struct timespec* deadline) {
-  return syscall(SYS_futex, v, FUTEX_WAIT_BITSET_PRIVATE | FUTEX_CLOCK_REALTIME,
-                 val, deadline, nullptr, FUTEX_BITSET_MATCH_ANY);
-}
-
-inline int FutexWake(std::atomic<int32_t>* v, int32_t count) {
-  return syscall(SYS_futex, v, FUTEX_WAKE_PRIVATE, count);
-}
-
-// This just uses FUTEX_WAKE on an address with nothing waiting, very simple.
-void BM_FutexWakeNop(benchmark::State& state) {
-  std::atomic<int32_t> v(0);
-
-  for (auto _ : state) {
-    TEST_PCHECK(FutexWake(&v, 1) == 0);
-  }
-}
-
-BENCHMARK(BM_FutexWakeNop)->MinTime(5);
-
-// This just uses FUTEX_WAIT on an address whose value has changed, i.e., the
-// syscall won't wait.
-void BM_FutexWaitNop(benchmark::State& state) {
-  std::atomic<int32_t> v(0);
-
-  for (auto _ : state) {
-    TEST_PCHECK(FutexWait(&v, 1) == -1 && errno == EAGAIN);
-  }
-}
-
-BENCHMARK(BM_FutexWaitNop)->MinTime(5);
-
-// This uses FUTEX_WAIT with a timeout on an address whose value never
-// changes, such that it always times out. Timeout overhead can be estimated by
-// timer overruns for short timeouts.
-void BM_FutexWaitMonotonicTimeout(benchmark::State& state) {
-  const absl::Duration timeout = absl::Nanoseconds(state.range(0));
-  std::atomic<int32_t> v(0);
-  auto ts = absl::ToTimespec(timeout);
-
-  for (auto _ : state) {
-    TEST_PCHECK(FutexWaitMonotonicTimeout(&v, 0, &ts) == -1 &&
-                errno == ETIMEDOUT);
-  }
-}
-
-BENCHMARK(BM_FutexWaitMonotonicTimeout)
-    ->MinTime(5)
-    ->UseRealTime()
-    ->Arg(1)
-    ->Arg(10)
-    ->Arg(100)
-    ->Arg(1000)
-    ->Arg(10000);
-
-// This uses FUTEX_WAIT_BITSET with a deadline that is in the past. This allows
-// estimation of the overhead of setting up a timer for a deadline (as opposed
-// to a timeout as specified for FUTEX_WAIT).
-void BM_FutexWaitMonotonicDeadline(benchmark::State& state) {
-  std::atomic<int32_t> v(0);
-  struct timespec ts = {};
-
-  for (auto _ : state) {
-    TEST_PCHECK(FutexWaitMonotonicDeadline(&v, 0, &ts) == -1 &&
-                errno == ETIMEDOUT);
-  }
-}
-
-BENCHMARK(BM_FutexWaitMonotonicDeadline)->MinTime(5);
-
-// This is equivalent to BM_FutexWaitMonotonicDeadline, but uses CLOCK_REALTIME
-// instead of CLOCK_MONOTONIC for the deadline.
-void BM_FutexWaitRealtimeDeadline(benchmark::State& state) {
-  std::atomic<int32_t> v(0);
-  struct timespec ts = {};
-
-  for (auto _ : state) {
-    TEST_PCHECK(FutexWaitRealtimeDeadline(&v, 0, &ts) == -1 &&
-                errno == ETIMEDOUT);
-  }
-}
-
-BENCHMARK(BM_FutexWaitRealtimeDeadline)->MinTime(5);
-
-int64_t GetCurrentMonotonicTimeNanos() {
-  struct timespec ts;
-  TEST_CHECK(clock_gettime(CLOCK_MONOTONIC, &ts) != -1);
-  return ts.tv_sec * 1000000000ULL + ts.tv_nsec;
-}
-
-void SpinNanos(int64_t delay_ns) {
-  if (delay_ns <= 0) {
-    return;
-  }
-  const int64_t end = GetCurrentMonotonicTimeNanos() + delay_ns;
-  while (GetCurrentMonotonicTimeNanos() < end) {
-    // spin
-  }
-}
-
-// Each iteration of FutexRoundtripDelayed involves a thread sending a futex
-// wakeup to another thread, which spins for delay_us and then sends a futex
-// wakeup back. The time per iteration is 2 * (delay_us + kBeforeWakeDelayNs +
-// futex/scheduling overhead).
-void BM_FutexRoundtripDelayed(benchmark::State& state) {
-  const int delay_us = state.range(0);
-  const int64_t delay_ns = delay_us * 1000;
-  // Spin for an extra kBeforeWakeDelayNs before invoking FUTEX_WAKE to reduce
-  // the probability that the wakeup comes before the wait, preventing the wait
-  // from ever taking effect and causing the benchmark to underestimate the
-  // actual wakeup time.
-  constexpr int64_t kBeforeWakeDelayNs = 500;
-  std::atomic<int32_t> v(0);
-  ScopedThread t([&] {
-    for (int i = 0; i < state.max_iterations; i++) {
-      SpinNanos(delay_ns);
-      while (v.load(std::memory_order_acquire) == 0) {
-        FutexWait(&v, 0);
-      }
-      SpinNanos(kBeforeWakeDelayNs + delay_ns);
-      v.store(0, std::memory_order_release);
-      FutexWake(&v, 1);
-    }
-  });
-  for (auto _ : state) {
-    SpinNanos(kBeforeWakeDelayNs + delay_ns);
-    v.store(1, std::memory_order_release);
-    FutexWake(&v, 1);
-    SpinNanos(delay_ns);
-    while (v.load(std::memory_order_acquire) == 1) {
-      FutexWait(&v, 1);
-    }
-  }
-}
-
-BENCHMARK(BM_FutexRoundtripDelayed)
-    ->MinTime(5)
-    ->UseRealTime()
-    ->Arg(0)
-    ->Arg(10)
-    ->Arg(20)
-    ->Arg(50)
-    ->Arg(100);
-
-}  // namespace
-
-}  // namespace testing
-}  // namespace gvisor