1 /* 2 * Copyright (C) 2025 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 #pragma once 18 19 namespace android::binder { 20 21 /** 22 * See also BINDER_VM_SIZE. In kernel binder, the sum of all transactions must be allocated in this 23 * space. Large transactions are very error prone. In general, we should work to reduce this limit. 24 * The same limit is used in RPC binder for consistency. 25 */ 26 constexpr size_t kLogTransactionsOverBytes = 300 * 1024; 27 28 /** 29 * See b/392575419 - this limit is chosen for a specific usecase, because RPC binder does not have 30 * support for shared memory in the Android Baklava timeframe. This was 100 KB during and before 31 * Android V. 32 * 33 * Keeping this low helps preserve overall system performance. Transactions of this size are far too 34 * expensive to make multiple copies over binder or sockets, and they should be avoided if at all 35 * possible and transition to shared memory. 36 */ 37 constexpr size_t kRpcTransactionLimitBytes = 600 * 1024; 38 39 } // namespace android::binder 40