gpu: Reuse transfer buffers more aggresively

gpu/command_buffer/client/gles2_implementation.cc

 // Copyright (c) 2012 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.
 
 // A class to emulate GLES2 over command buffers.
 
 #include "gpu/command_buffer/client/gles2_implementation.h"
 
 #include <algorithm>
 #include <map>
@@ skipping 137 matching lines @@
   if (!transfer_buffer_->Initialize(
       starting_transfer_buffer_size,
       kStartingOffset,
       min_transfer_buffer_size,
       max_transfer_buffer_size,
       kAlignment,
       kSizeToFlush)) {
     return false;
   }
 
-  mapped_memory_.reset(new MappedMemoryManager(helper_, mapped_memory_limit));
+  MappedMemoryManagerSettings mapped_memory_settings;
+  mapped_memory_settings.unused_memory_reclaim_limit =
+      mapped_memory_limit;
+  mapped_memory_settings.aggressive_reuse = false;
+  mapped_memory_.reset(new MappedMemoryManager(
+      helper_, mapped_memory_settings));
 
+  MappedMemoryManagerSettings transfer_buffer_memory_settings;
+  transfer_buffer_memory_settings.unused_memory_reclaim_limit =
+      mapped_memory_limit;
+  transfer_buffer_memory_settings.aggressive_reuse = true;
+  transfer_buffer_memory_.reset(new MappedMemoryManager(
+      helper_, transfer_buffer_memory_settings));
+
+  // Set the chunk size of transfer buffer chunks. Let the generic memory
+  // manager allocate chunks to be as small as possible, i.e. the default size
+  // multiple 1.
   unsigned chunk_size = 2 * 1024 * 1024;
   if (mapped_memory_limit != kNoLimit) {
     // Use smaller chunks if the client is very memory conscientious.
     chunk_size = std::min(mapped_memory_limit / 4, chunk_size);
   }
-  mapped_memory_->set_chunk_size_multiple(chunk_size);
+  transfer_buffer_memory_->set_chunk_size_multiple(chunk_size);
 
   if (!QueryAndCacheStaticState())
     return false;
 
   util_.set_num_compressed_texture_formats(
       static_state_.int_state.num_compressed_texture_formats);
   util_.set_num_shader_binary_formats(
       static_state_.int_state.num_shader_binary_formats);
 
   texture_units_.reset(
       new TextureUnit[
           static_state_.int_state.max_combined_texture_image_units]);
 
   query_tracker_.reset(new QueryTracker(mapped_memory_.get()));
-  buffer_tracker_.reset(new BufferTracker(mapped_memory_.get()));
+  buffer_tracker_.reset(new BufferTracker(transfer_buffer_memory_.get()));
   gpu_memory_buffer_tracker_.reset(new GpuMemoryBufferTracker(gpu_control_));
 
 #if defined(GLES2_SUPPORT_CLIENT_SIDE_ARRAYS)
   GetIdHandler(id_namespaces::kBuffers)->MakeIds(
       this, kClientSideArrayId, arraysize(reserved_ids_), &reserved_ids_[0]);
 #endif
 
   vertex_array_object_manager_.reset(new VertexArrayObjectManager(
       static_state_.int_state.max_vertex_attribs,
       reserved_ids_[0],
@@ skipping 106 matching lines @@
 int32 GLES2Implementation::GetResultShmId() {
   return transfer_buffer_->GetShmId();
 }
 
 uint32 GLES2Implementation::GetResultShmOffset() {
   return transfer_buffer_->GetResultOffset();
 }
 
 void GLES2Implementation::FreeUnusedSharedMemory() {
   mapped_memory_->FreeUnused();
+  transfer_buffer_memory_->FreeUnused();
 }
 
 void GLES2Implementation::FreeEverything() {
   WaitForCmd();
   query_tracker_->Shrink();
   FreeUnusedSharedMemory();
   transfer_buffer_->Free();
   helper_->FreeRingBuffer();
 }
 
@@ skipping 3598 matching lines @@
   CheckGLError();
 }
 
 // Include the auto-generated part of this file. We split this because it means
 // we can easily edit the non-auto generated parts right here in this file
 // instead of having to edit some template or the code generator.
 #include "gpu/command_buffer/client/gles2_implementation_impl_autogen.h"
 
 }  // namespace gles2
 }  // namespace gpu