rocksdb/memory/concurrent_arena.cc
sdong fdf882ded2 Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433)
Summary:
When dynamically linking two binaries together, different builds of RocksDB from two sources might cause errors. To provide a tool for user to solve the problem, the RocksDB namespace is changed to a flag which can be overridden in build time.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/6433

Test Plan: Build release, all and jtest. Try to build with ROCKSDB_NAMESPACE with another flag.

Differential Revision: D19977691

fbshipit-source-id: aa7f2d0972e1c31d75339ac48478f34f6cfcfb3e
2020-02-20 12:09:57 -08:00

48 lines
1.6 KiB
C++

// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
// This source code is licensed under both the GPLv2 (found in the
// COPYING file in the root directory) and Apache 2.0 License
// (found in the LICENSE.Apache file in the root directory).
//
// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file. See the AUTHORS file for names of contributors.
#include "memory/concurrent_arena.h"
#include <thread>
#include "port/port.h"
#include "util/random.h"
namespace ROCKSDB_NAMESPACE {
#ifdef ROCKSDB_SUPPORT_THREAD_LOCAL
__thread size_t ConcurrentArena::tls_cpuid = 0;
#endif
namespace {
// If the shard block size is too large, in the worst case, every core
// allocates a block without populate it. If the shared block size is
// 1MB, 64 cores will quickly allocate 64MB, and may quickly trigger a
// flush. Cap the size instead.
const size_t kMaxShardBlockSize = size_t{128 * 1024};
} // namespace
ConcurrentArena::ConcurrentArena(size_t block_size, AllocTracker* tracker,
size_t huge_page_size)
: shard_block_size_(std::min(kMaxShardBlockSize, block_size / 8)),
shards_(),
arena_(block_size, tracker, huge_page_size) {
Fixup();
}
ConcurrentArena::Shard* ConcurrentArena::Repick() {
auto shard_and_index = shards_.AccessElementAndIndex();
#ifdef ROCKSDB_SUPPORT_THREAD_LOCAL
// even if we are cpu 0, use a non-zero tls_cpuid so we can tell we
// have repicked
tls_cpuid = shard_and_index.second | shards_.Size();
#endif
return shard_and_index.first;
}
} // namespace ROCKSDB_NAMESPACE