1 /*
2 * Copyright (C) 2022 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include "MemoryPolicy.h"
18
19 #include <android-base/properties.h>
20
21 #include <optional>
22 #include <string_view>
23
24 #include "Properties.h"
25
26 namespace android::uirenderer {
27
28 constexpr static MemoryPolicy sDefaultMemoryPolicy;
29 constexpr static MemoryPolicy sPersistentOrSystemPolicy{
30 .contextTimeout = 10_s,
31 .minimumResourceRetention = 1_s,
32 .maximumResourceRetention = 10_s,
33 .useAlternativeUiHidden = true,
34 .purgeScratchOnly = false,
35 };
36 constexpr static MemoryPolicy sLowRamPolicy{
37 .useAlternativeUiHidden = true,
38 .purgeScratchOnly = false,
39 };
40 constexpr static MemoryPolicy sExtremeLowRam{
41 .initialMaxSurfaceAreaScale = 0.2f,
42 .surfaceSizeMultiplier = 5 * 4.0f,
43 .backgroundRetentionPercent = 0.2f,
44 .contextTimeout = 5_s,
45 .minimumResourceRetention = 1_s,
46 .useAlternativeUiHidden = true,
47 .purgeScratchOnly = false,
48 .releaseContextOnStoppedOnly = true,
49 };
50
loadMemoryPolicy()51 const MemoryPolicy& loadMemoryPolicy() {
52 if (Properties::isSystemOrPersistent) {
53 return sPersistentOrSystemPolicy;
54 }
55 std::string memoryPolicy = base::GetProperty(PROPERTY_MEMORY_POLICY, "");
56 if (memoryPolicy == "default") {
57 return sDefaultMemoryPolicy;
58 }
59 if (memoryPolicy == "lowram") {
60 return sLowRamPolicy;
61 }
62 if (memoryPolicy == "extremelowram") {
63 return sExtremeLowRam;
64 }
65
66 if (Properties::isLowRam) {
67 return sLowRamPolicy;
68 }
69 return sDefaultMemoryPolicy;
70 }
71
72 } // namespace android::uirenderer