| // Licensed to the Apache Software Foundation (ASF) under one |
| // or more contributor license agreements. See the NOTICE file |
| // distributed with this work for additional information |
| // regarding copyright ownership. The ASF licenses this file |
| // to you 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. |
| |
| #include <cstdint> |
| |
| namespace kudu { |
| namespace process_memory { |
| |
| // Probabilistically returns true if the process-wide soft memory limit is exceeded. |
| // The greater the excess, the higher the chance that it returns true. |
| // |
| // If the soft limit is exceeded and 'current_capacity_pct' is not NULL, the percentage |
| // of the hard limit consumed is written to it. |
| bool SoftLimitExceeded(double* current_capacity_pct); |
| |
| // Return true if we are under memory pressure (i.e if we are nearing the point at which |
| // SoftLimitExceeded will begin to return true). |
| // |
| // If the process is under memory pressure, and 'current_capacity_pct' is not NULL, |
| // the percentage of the hard limit consumed is written to it. |
| bool UnderMemoryPressure(double* current_capacity_pct); |
| |
| // Potentially trigger a call to release tcmalloc memory back to the |
| // OS, after the given amount of memory was released. |
| void MaybeGCAfterRelease(int64_t released_bytes); |
| |
| // Return the total current memory consumption of the process. |
| int64_t CurrentConsumption(); |
| |
| // Return the configured hard limit for the process. |
| int64_t HardLimit(); |
| |
| // Return the configured soft limit for the process. |
| int64_t SoftLimit(); |
| |
| // Return the configured memory pressure threshold for the process. |
| int64_t MemoryPressureThreshold(); |
| |
| #ifdef TCMALLOC_ENABLED |
| // Get the current amount of allocated memory, according to tcmalloc. |
| // |
| // This should be equal to CurrentConsumption(), but is made available so that tests |
| // can verify the correctness of CurrentConsumption(). |
| int64_t GetTCMallocCurrentAllocatedBytes(); |
| |
| // Try to release free memory back to the operating system for reuse. |
| void GcTcmalloc(); |
| #endif |
| |
| } // namespace process_memory |
| } // namespace kudu |