| // Copyright 2018 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "third_party/blink/renderer/platform/bindings/parkable_string.h" |
| #include "third_party/blink/renderer/platform/bindings/parkable_string_manager.h" |
| |
| #include <thread> |
| #include <vector> |
| |
| #include "base/test/metrics/histogram_tester.h" |
| #include "testing/gtest/include/gtest/gtest.h" |
| |
| namespace blink { |
| |
| namespace { |
| |
| String MakeLargeString() { |
| std::vector<char> data(20000, 'a'); |
| return String(String(data.data(), data.size()).ReleaseImpl()); |
| } |
| |
| } // namespace |
| |
| class ParkableStringTest : public ::testing::Test { |
| protected: |
| void SetUp() override { |
| ParkableStringManager::Instance().SetRendererBackgrounded(false); |
| } |
| }; |
| |
| TEST_F(ParkableStringTest, Simple) { |
| ParkableString parkable_abc(String("abc").ReleaseImpl()); |
| |
| EXPECT_TRUE(ParkableString().IsNull()); |
| EXPECT_FALSE(parkable_abc.IsNull()); |
| EXPECT_TRUE(parkable_abc.Is8Bit()); |
| EXPECT_EQ(3u, parkable_abc.length()); |
| EXPECT_EQ(3u, parkable_abc.CharactersSizeInBytes()); |
| EXPECT_FALSE(parkable_abc.is_parkable()); // Small strings are not parkable. |
| |
| EXPECT_EQ(String("abc"), parkable_abc.ToString()); |
| ParkableString copy = parkable_abc; |
| EXPECT_EQ(copy.Impl(), parkable_abc.Impl()); |
| } |
| |
| TEST_F(ParkableStringTest, Park) { |
| base::HistogramTester histogram_tester; |
| |
| { |
| ParkableString parkable(MakeLargeString().ReleaseImpl()); |
| EXPECT_TRUE(parkable.is_parkable()); |
| EXPECT_FALSE(parkable.Impl()->is_parked()); |
| EXPECT_TRUE(parkable.Impl()->Park()); |
| EXPECT_TRUE(parkable.Impl()->is_parked()); |
| } |
| |
| String large_string = MakeLargeString(); |
| ParkableString parkable(large_string.Impl()); |
| EXPECT_TRUE(parkable.is_parkable()); |
| // Not the only one to have a reference to the string. |
| EXPECT_FALSE(parkable.Impl()->Park()); |
| large_string = String(); |
| EXPECT_TRUE(parkable.Impl()->Park()); |
| |
| histogram_tester.ExpectBucketCount( |
| "Memory.MovableStringParkingAction", |
| ParkableStringImpl::ParkingAction::kParkedInBackground, 2); |
| histogram_tester.ExpectTotalCount("Memory.MovableStringParkingAction", 2); |
| } |
| |
| TEST_F(ParkableStringTest, Unpark) { |
| base::HistogramTester histogram_tester; |
| |
| ParkableString parkable(MakeLargeString().Impl()); |
| String unparked_copy = parkable.ToString().IsolatedCopy(); |
| EXPECT_TRUE(parkable.is_parkable()); |
| EXPECT_FALSE(parkable.Impl()->is_parked()); |
| EXPECT_TRUE(parkable.Impl()->Park()); |
| EXPECT_TRUE(parkable.Impl()->is_parked()); |
| |
| String unparked = parkable.ToString(); |
| EXPECT_EQ(unparked_copy, unparked); |
| EXPECT_FALSE(parkable.Impl()->is_parked()); |
| |
| histogram_tester.ExpectTotalCount("Memory.MovableStringParkingAction", 2); |
| histogram_tester.ExpectBucketCount( |
| "Memory.MovableStringParkingAction", |
| ParkableStringImpl::ParkingAction::kParkedInBackground, 1); |
| histogram_tester.ExpectBucketCount( |
| "Memory.MovableStringParkingAction", |
| ParkableStringImpl::ParkingAction::kUnparkedInForeground, 1); |
| } |
| |
| TEST_F(ParkableStringTest, LockUnlock) { |
| ParkableString parkable(MakeLargeString().Impl()); |
| ParkableStringImpl* impl = parkable.Impl(); |
| EXPECT_EQ(0, impl->lock_depth_); |
| |
| parkable.Lock(); |
| EXPECT_EQ(1, impl->lock_depth_); |
| parkable.Lock(); |
| parkable.Unlock(); |
| EXPECT_EQ(1, impl->lock_depth_); |
| parkable.Unlock(); |
| EXPECT_EQ(0, impl->lock_depth_); |
| |
| parkable.Lock(); |
| EXPECT_FALSE(impl->Park()); |
| parkable.Unlock(); |
| EXPECT_TRUE(impl->Park()); |
| |
| std::thread t([&]() { parkable.Lock(); }); |
| t.join(); |
| EXPECT_FALSE(impl->Park()); |
| parkable.Unlock(); |
| EXPECT_TRUE(impl->Park()); |
| } |
| |
| TEST_F(ParkableStringTest, LockParkedString) { |
| ParkableString parkable(MakeLargeString().Impl()); |
| ParkableStringImpl* impl = parkable.Impl(); |
| EXPECT_EQ(0, impl->lock_depth_); |
| EXPECT_TRUE(impl->Park()); |
| |
| parkable.Lock(); // Locking doesn't unpark. |
| EXPECT_TRUE(impl->is_parked()); |
| parkable.ToString(); |
| EXPECT_FALSE(impl->is_parked()); |
| EXPECT_EQ(1, impl->lock_depth_); |
| |
| EXPECT_FALSE(impl->Park()); |
| parkable.Unlock(); |
| EXPECT_EQ(0, impl->lock_depth_); |
| EXPECT_TRUE(impl->Park()); |
| EXPECT_TRUE(impl->is_parked()); |
| } |
| |
| TEST_F(ParkableStringTest, TableSimple) { |
| base::HistogramTester histogram_tester; |
| |
| std::vector<char> data(20000, 'a'); |
| ParkableString parkable(String(data.data(), data.size()).ReleaseImpl()); |
| ASSERT_FALSE(parkable.Impl()->is_parked()); |
| |
| auto& manager = ParkableStringManager::Instance(); |
| EXPECT_EQ(1u, manager.table_.size()); |
| |
| // Small strings are not in the table. |
| ParkableString small(String("abc").ReleaseImpl()); |
| EXPECT_EQ(1u, manager.table_.size()); |
| |
| // No parking as the current state is not "backgrounded". |
| manager.SetRendererBackgrounded(false); |
| ASSERT_FALSE(manager.IsRendererBackgrounded()); |
| manager.ParkAllIfRendererBackgrounded(); |
| EXPECT_FALSE(parkable.Impl()->is_parked()); |
| histogram_tester.ExpectTotalCount("Memory.MovableStringsCount", 0); |
| |
| manager.SetRendererBackgrounded(true); |
| ASSERT_TRUE(manager.IsRendererBackgrounded()); |
| manager.ParkAllIfRendererBackgrounded(); |
| EXPECT_TRUE(parkable.Impl()->is_parked()); |
| histogram_tester.ExpectUniqueSample("Memory.MovableStringsCount", 1, 1); |
| |
| // Park and unpark. |
| parkable.ToString(); |
| EXPECT_FALSE(parkable.Impl()->is_parked()); |
| manager.ParkAllIfRendererBackgrounded(); |
| EXPECT_TRUE(parkable.Impl()->is_parked()); |
| histogram_tester.ExpectUniqueSample("Memory.MovableStringsCount", 1, 2); |
| |
| // More than one reference, no parking. |
| manager.SetRendererBackgrounded(false); |
| String alive_unparked = parkable.ToString(); // Unparked in foreground. |
| manager.SetRendererBackgrounded(true); |
| manager.ParkAllIfRendererBackgrounded(); |
| EXPECT_FALSE(parkable.Impl()->is_parked()); |
| |
| // Other reference is dropped, OK to park. |
| alive_unparked = String(); |
| manager.ParkAllIfRendererBackgrounded(); |
| EXPECT_TRUE(parkable.Impl()->is_parked()); |
| |
| histogram_tester.ExpectTotalCount("Memory.MovableStringParkingAction", 5); |
| histogram_tester.ExpectBucketCount( |
| "Memory.MovableStringParkingAction", |
| ParkableStringImpl::ParkingAction::kParkedInBackground, 3); |
| histogram_tester.ExpectBucketCount( |
| "Memory.MovableStringParkingAction", |
| ParkableStringImpl::ParkingAction::kUnparkedInBackground, 1); |
| histogram_tester.ExpectBucketCount( |
| "Memory.MovableStringParkingAction", |
| ParkableStringImpl::ParkingAction::kUnparkedInForeground, 1); |
| } |
| |
| TEST_F(ParkableStringTest, TableMultiple) { |
| base::HistogramTester histogram_tester; |
| |
| size_t size_kb = 20; |
| std::vector<char> data(size_kb * 1000, 'a'); |
| ParkableString parkable(String(data.data(), data.size()).ReleaseImpl()); |
| ParkableString parkable2(String(data.data(), data.size()).ReleaseImpl()); |
| |
| auto& manager = ParkableStringManager::Instance(); |
| EXPECT_EQ(2u, manager.table_.size()); |
| |
| parkable2 = ParkableString(); |
| EXPECT_EQ(1u, manager.table_.size()); |
| |
| ParkableString copy = parkable; |
| parkable = ParkableString(); |
| EXPECT_EQ(1u, manager.table_.size()); |
| copy = ParkableString(); |
| EXPECT_EQ(0u, manager.table_.size()); |
| |
| String str(data.data(), data.size()); |
| ParkableString parkable3(str.Impl()); |
| EXPECT_EQ(1u, manager.table_.size()); |
| // De-duplicated. |
| ParkableString other_parkable3(str.Impl()); |
| EXPECT_EQ(1u, manager.table_.size()); |
| EXPECT_EQ(parkable3.Impl(), other_parkable3.Impl()); |
| |
| // If all the references to a string are in the table, park it. |
| str = String(); |
| manager.SetRendererBackgrounded(true); |
| ASSERT_TRUE(manager.IsRendererBackgrounded()); |
| manager.ParkAllIfRendererBackgrounded(); |
| EXPECT_TRUE(parkable3.Impl()->is_parked()); |
| |
| // Only drop it from the table when the last one is gone. |
| parkable3 = ParkableString(); |
| EXPECT_EQ(1u, manager.table_.size()); |
| other_parkable3 = ParkableString(); |
| EXPECT_EQ(0u, manager.table_.size()); |
| |
| histogram_tester.ExpectUniqueSample("Memory.MovableStringsCount", 1, 1); |
| histogram_tester.ExpectUniqueSample("Memory.MovableStringsTotalSizeKb", |
| size_kb, 1); |
| histogram_tester.ExpectTotalCount("Memory.MovableStringParkingAction", 1); |
| histogram_tester.ExpectBucketCount( |
| "Memory.MovableStringParkingAction", |
| ParkableStringImpl::ParkingAction::kParkedInBackground, 1); |
| } |
| |
| TEST_F(ParkableStringTest, ShouldPark) { |
| String null_string; |
| EXPECT_FALSE(ParkableStringManager::ShouldPark(null_string.Impl())); |
| String empty_string(""); |
| EXPECT_FALSE(ParkableStringManager::ShouldPark(empty_string.Impl())); |
| std::vector<char> data(20 * 1000, 'a'); |
| |
| String parkable(String(data.data(), data.size()).ReleaseImpl()); |
| EXPECT_TRUE(ParkableStringManager::ShouldPark(parkable.Impl())); |
| |
| std::thread t([]() { |
| std::vector<char> data(20 * 1000, 'a'); |
| String parkable(String(data.data(), data.size()).ReleaseImpl()); |
| EXPECT_FALSE(ParkableStringManager::ShouldPark(parkable.Impl())); |
| }); |
| t.join(); |
| } |
| |
| } // namespace blink |