rocksdb/util/concurrent_arena.cc
Andrew Kryczka cda5fde2d9 CoreLocalArray class
Summary:
Moved the logic for core-local array out of ConcurrentArena and into a separate class because I want to reuse it for core-local stats.
Closes https://github.com/facebook/rocksdb/pull/2256

Differential Revision: D5011518

Pulled By: ajkr

fbshipit-source-id: a75a7b8f7b7a42fd6273489ada405f14c6be196a
2017-05-10 18:25:36 -07:00

42 lines
1.4 KiB
C++

// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
// This source code is licensed under the BSD-style license found in the
// LICENSE file in the root directory of this source tree. An additional grant
// of patent rights can be found in the PATENTS file in the same directory.
// This source code is also licensed under the GPLv2 license found in the
// COPYING file in the root directory of this source tree.
//
// 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 "util/concurrent_arena.h"
#include <thread>
#include "port/likely.h"
#include "port/port.h"
#include "util/random.h"
namespace rocksdb {
#ifdef ROCKSDB_SUPPORT_THREAD_LOCAL
__thread size_t ConcurrentArena::tls_cpuid = 0;
#endif
ConcurrentArena::ConcurrentArena(size_t block_size, size_t huge_page_size)
: shard_block_size_(block_size / 8),
shards_(),
arena_(block_size, 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