src/kudu/util/locks.cc

// Copyright 2015 Cloudera, Inc.
//
// 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.

#include "kudu/util/locks.h"

#include "kudu/util/malloc.h"

namespace kudu {

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