Global GPU memory manager for android webview

android_webview/browser/gpu_memory_manager.cc

+// Copyright 2014 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 "android_webview/browser/gl_view_renderer_manager.h"
+#include "android_webview/browser/gpu_memory_manager.h"
+#include "base/lazy_instance.h"
+
+#include "base/logging.h"
+using base::AutoLock;
+
+namespace android_webview {
+
+namespace {
+  base::LazyInstance<GpuMemoryManager>::Leaky g_gpu_memory_manager =
+      LAZY_INSTANCE_INITIALIZER;
+} // namespace
+
+// TODO(hush): need to scale up/down this number based on your devide
+const size_t GpuMemoryManager::kGpuMemoryLimit = 256 * 1024 * 1024;

[boliu, 2014/04/08 03:06:45]

how about assume the limiting resource is always fd, and don't worry about
memory?

+const size_t GpuMemoryManager::kNumResourcesLimit = 512;
+
+// static
+GpuMemoryManager* GpuMemoryManager::GetInstance() {
+  return g_gpu_memory_manager.Pointer();
+}
+
+MemoryPolicy GpuMemoryManager::EvictUntilSatisfied(
+    MemoryPolicy desired_policy, Key key) {
+  lock_.AssertAcquired();
+  MemoryPolicy total_evicted =
+      GLViewRendererManager::GetInstance()->
+          EvictUntilSatisfied(desired_policy, key);
+
+  return total_evicted;
+}
+
+void GpuMemoryManager::UpdateResources(
+    MemoryPolicy& old_policy, MemoryPolicy& new_policy, Key key) {
+  AutoLock auto_lock(lock_);
+  size_t gpu_memory = allocated_.bytes_limit - old_policy.bytes_limit +
+      new_policy.bytes_limit;
+  size_t num_resources = allocated_.num_resources_limit -
+      old_policy.num_resources_limit + new_policy.num_resources_limit;
+
+  if (gpu_memory > kGpuMemoryLimit || num_resources > kNumResourcesLimit) {
+    MemoryPolicy memory_to_evict;
+    if (gpu_memory > kGpuMemoryLimit) {
+      memory_to_evict.bytes_limit = gpu_memory - kGpuMemoryLimit;
+    }
+
+    if (num_resources > kNumResourcesLimit) {
+      memory_to_evict.num_resources_limit = num_resources - kNumResourcesLimit;
+    }
+
+    MemoryPolicy total_evicted = EvictUntilSatisfied(memory_to_evict, key);
+    gpu_memory -= total_evicted.bytes_limit;
+    num_resources -= total_evicted.num_resources_limit;
+  }
+
+  allocated_.bytes_limit = gpu_memory;
+  allocated_.num_resources_limit = num_resources;
+}
+
+GpuMemoryManager::GpuMemoryManager() {}
+
+GpuMemoryManager::~GpuMemoryManager() {}
+
+} // namespace webview