gpu: Reuse transfer buffers more aggresively

gpu/command_buffer/client/fenced_allocator_test.cc

Index: gpu/command_buffer/client/fenced_allocator_test.cc
diff --git a/gpu/command_buffer/client/fenced_allocator_test.cc b/gpu/command_buffer/client/fenced_allocator_test.cc
index f21353593c0864e862ac7077d7ec0f26242418da..2db1328153053f1e3ce69b054c0361e68757a054 100644
--- a/gpu/command_buffer/client/fenced_allocator_test.cc
+++ b/gpu/command_buffer/client/fenced_allocator_test.cc
@@ -29,6 +29,7 @@ using testing::Truly;
 using testing::Sequence;
 using testing::DoAll;
 using testing::Invoke;
+using testing::InvokeWithoutArgs;
 using testing::_;
 
 class BaseFencedAllocatorTest : public testing::Test {
@@ -88,6 +89,11 @@ class BaseFencedAllocatorTest : public testing::Test {
 const unsigned int BaseFencedAllocatorTest::kBufferSize;
 #endif
 
+namespace {
+void EmptyPoll() {
+}
+}
+
 // Test fixture for FencedAllocator test - Creates a FencedAllocator, using a
 // CommandBufferHelper with a mock AsyncAPIInterface for its interface (calling
 // it directly, not through the RPC mechanism), making sure Noops are ignored
@@ -96,7 +102,9 @@ class FencedAllocatorTest : public BaseFencedAllocatorTest {
  protected:
   virtual void SetUp() {
     BaseFencedAllocatorTest::SetUp();
-    allocator_.reset(new FencedAllocator(kBufferSize, helper_.get()));
+    allocator_.reset(new FencedAllocator(kBufferSize,
+                                         helper_.get(),
+                                         base::Bind(&EmptyPoll)));
   }
 
   virtual void TearDown() {
@@ -391,6 +399,63 @@ TEST_F(FencedAllocatorTest, TestGetLargestFreeOrPendingSize) {
   EXPECT_EQ(kBufferSize, allocator_->GetLargestFreeSize());
 }
 
+class FencedAllocatorPollTest : public BaseFencedAllocatorTest {
+ public:
+  static const unsigned int kAllocSize = 128;
+
+  MOCK_METHOD0(MockedPoll, void());
+
+ protected:
+  virtual void TearDown() {
+    // If the GpuScheduler posts any tasks, this forces them to run.
+    base::MessageLoop::current()->RunUntilIdle();
+
+    BaseFencedAllocatorTest::TearDown();
+  }
+};
+
+TEST_F(FencedAllocatorPollTest, TestPoll) {
+  scoped_ptr<FencedAllocator> allocator(
+      new FencedAllocator(kBufferSize,
+                          helper_.get(),
+                          base::Bind(&FencedAllocatorPollTest::MockedPoll,
+                                     base::Unretained(this))));
+
+  FencedAllocator::Offset mem1 = allocator->Alloc(kAllocSize);
+  FencedAllocator::Offset mem2 = allocator->Alloc(kAllocSize);
+  EXPECT_NE(mem1, FencedAllocator::kInvalidOffset);
+  EXPECT_NE(mem2, FencedAllocator::kInvalidOffset);
+  EXPECT_TRUE(allocator->CheckConsistency());
+  EXPECT_EQ(allocator->bytes_in_use(), kAllocSize * 2);
+
+  // Check that no-op Poll doesn't affect the state.
+  EXPECT_CALL(*this, MockedPoll()).RetiresOnSaturation();
+  allocator->FreeUnused();
+  EXPECT_TRUE(allocator->CheckConsistency());
+  EXPECT_EQ(allocator->bytes_in_use(), kAllocSize * 2);
+
+  // Check that freeing in Poll works.
+  base::Closure free_mem1_closure =
+      base::Bind(&FencedAllocator::Free,
+                 base::Unretained(allocator.get()),
+                 mem1);
+  EXPECT_CALL(*this, MockedPoll())
+      .WillOnce(InvokeWithoutArgs(&free_mem1_closure, &base::Closure::Run))
+      .RetiresOnSaturation();
+  allocator->FreeUnused();
+  EXPECT_TRUE(allocator->CheckConsistency());
+  EXPECT_EQ(allocator->bytes_in_use(), kAllocSize * 1);
+
+  // Check that freeing still works.
+  EXPECT_CALL(*this, MockedPoll()).RetiresOnSaturation();
+  allocator->Free(mem2);
+  allocator->FreeUnused();
+  EXPECT_TRUE(allocator->CheckConsistency());
+  EXPECT_EQ(allocator->bytes_in_use(), 0u);
+
+  allocator.reset();
+}
+
 // Test fixture for FencedAllocatorWrapper test - Creates a
 // FencedAllocatorWrapper, using a CommandBufferHelper with a mock
 // AsyncAPIInterface for its interface (calling it directly, not through the
@@ -406,7 +471,9 @@ class FencedAllocatorWrapperTest : public BaseFencedAllocatorTest {
     // something.
     buffer_.reset(static_cast<char*>(base::AlignedAlloc(
         kBufferSize, kAllocAlignment)));
-    allocator_.reset(new FencedAllocatorWrapper(kBufferSize, helper_.get(),
+    allocator_.reset(new FencedAllocatorWrapper(kBufferSize,
+                                                helper_.get(),
+                                                base::Bind(&EmptyPoll),
                                                 buffer_.get()));
   }