| // 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 "kudu/util/locks.h" |
| |
| #include "kudu/gutil/atomicops.h" |
| #include "kudu/util/malloc.h" |
| |
| namespace kudu { |
| |
| using base::subtle::Acquire_CompareAndSwap; |
| using base::subtle::NoBarrier_Load; |
| using base::subtle::Release_Store; |
| |
| size_t percpu_rwlock::memory_footprint_excluding_this() const { |
| // Because locks_ is a dynamic array of non-trivially-destructable types, |
| // the returned pointer from new[] isn't guaranteed to point at the start of |
| // a memory block, rendering it useless for malloc_usable_size(). |
| // |
| // Rather than replace locks_ with a vector or something equivalent, we'll |
| // just measure the memory footprint using sizeof(), with the understanding |
| // that we might be inaccurate due to malloc "slop". |
| // |
| // See https://code.google.com/p/address-sanitizer/issues/detail?id=395 for |
| // more details. |
| return n_cpus_ * sizeof(padded_lock); |
| } |
| |
| size_t percpu_rwlock::memory_footprint_including_this() const { |
| return kudu_malloc_usable_size(this) + memory_footprint_excluding_this(); |
| } |
| |
| } // namespace kudu |