1 files changed, 123 insertions, 0 deletions
diff --git a/src/test/rgw/test_rgw_throttle.cc b/src/test/rgw/test_rgw_throttle.cc
new file mode 100644
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+++ b/src/test/rgw/test_rgw_throttle.cc
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+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2018 Red Hat, Inc.
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software
+ * Foundation. See file COPYING.
+ *
+ */
+
+#include "rgw/rgw_aio_throttle.h"
+#include "rgw/rgw_rados.h"
+
+#include "include/rados/librados.hpp"
+
+#include <gtest/gtest.h>
+
+struct RadosEnv : public ::testing::Environment {
+ public:
+  static constexpr auto poolname = "ceph_test_rgw_throttle";
+
+  static std::optional<RGWSI_RADOS> rados;
+
+  void SetUp() override {
+    rados.emplace(g_ceph_context);
+    ASSERT_EQ(0, rados->start());
+    int r = rados->pool({poolname}).create();
+    if (r == -EEXIST)
+      r = 0;
+    ASSERT_EQ(0, r);
+  }
+  void TearDown() {
+    rados.reset();
+  }
+};
+std::optional<RGWSI_RADOS> RadosEnv::rados;
+
+auto *const rados_env = ::testing::AddGlobalTestEnvironment(new RadosEnv);
+
+// test fixture for global setup/teardown
+class RadosFixture : public ::testing::Test {
+ protected:
+  RGWSI_RADOS::Obj make_obj(const std::string& oid) {
+    auto obj = RadosEnv::rados->obj({{RadosEnv::poolname}, oid});
+    ceph_assert_always(0 == obj.open());
+    return obj;
+  }
+};
+
+using Aio_Throttle = RadosFixture;
+
+namespace rgw {
+
+TEST_F(Aio_Throttle, NoThrottleUpToMax)
+{
+  AioThrottle throttle(4);
+  auto obj = make_obj(__PRETTY_FUNCTION__);
+  {
+    librados::ObjectWriteOperation op1;
+    auto c1 = throttle.submit(obj, &op1, 1, 0);
+    EXPECT_TRUE(c1.empty());
+    librados::ObjectWriteOperation op2;
+    auto c2 = throttle.submit(obj, &op2, 1, 0);
+    EXPECT_TRUE(c2.empty());
+    librados::ObjectWriteOperation op3;
+    auto c3 = throttle.submit(obj, &op3, 1, 0);
+    EXPECT_TRUE(c3.empty());
+    librados::ObjectWriteOperation op4;
+    auto c4 = throttle.submit(obj, &op4, 1, 0);
+    EXPECT_TRUE(c4.empty());
+    // no completions because no ops had to wait
+    auto c5 = throttle.poll();
+  }
+  auto completions = throttle.drain();
+  ASSERT_EQ(4u, completions.size());
+  for (auto& c : completions) {
+    EXPECT_EQ(-EINVAL, c.result);
+  }
+}
+
+TEST_F(Aio_Throttle, CostOverWindow)
+{
+  AioThrottle throttle(4);
+  auto obj = make_obj(__PRETTY_FUNCTION__);
+
+  librados::ObjectWriteOperation op;
+  auto c = throttle.submit(obj, &op, 8, 0);
+  ASSERT_EQ(1u, c.size());
+  EXPECT_EQ(-EDEADLK, c.front().result);
+}
+
+TEST_F(Aio_Throttle, ThrottleOverMax)
+{
+  constexpr uint64_t window = 4;
+  AioThrottle throttle(window);
+
+  auto obj = make_obj(__PRETTY_FUNCTION__);
+
+  // issue 32 writes, and verify that max_outstanding <= window
+  constexpr uint64_t total = 32;
+  uint64_t max_outstanding = 0;
+  uint64_t outstanding = 0;
+
+  for (uint64_t i = 0; i < total; i++) {
+    librados::ObjectWriteOperation op;
+    auto c = throttle.submit(obj, &op, 1, 0);
+    outstanding++;
+    outstanding -= c.size();
+    if (max_outstanding < outstanding) {
+      max_outstanding = outstanding;
+    }
+  }
+  auto c = throttle.drain();
+  outstanding -= c.size();
+  EXPECT_EQ(0u, outstanding);
+  EXPECT_EQ(window, max_outstanding);
+}
+
+} // namespace rgw