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diff --git a/libs/binder/Constants.h b/libs/binder/Constants.h
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+++ b/libs/binder/Constants.h
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+/*
+ * Copyright (C) 2025 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+namespace android::binder {
+
+/**
+ * See also BINDER_VM_SIZE. In kernel binder, the sum of all transactions must be allocated in this
+ * space. Large transactions are very error prone. In general, we should work to reduce this limit.
+ * The same limit is used in RPC binder for consistency.
+ */
+constexpr size_t kLogTransactionsOverBytes = 300 * 1024;
+
+/**
+ * See b/392575419 - this limit is chosen for a specific usecase, because RPC binder does not have
+ * support for shared memory in the Android Baklava timeframe. This was 100 KB during and before
+ * Android V.
+ *
+ * Keeping this low helps preserve overall system performance. Transactions of this size are far too
+ * expensive to make multiple copies over binder or sockets, and they should be avoided if at all
+ * possible and transition to shared memory.
+ */
+constexpr size_t kRpcTransactionLimitBytes = 600 * 1024;
+
+} // namespace android::binder