Revision fa5a15ceb5d2b9ec7fc8ed1580a01cd72b896ac9 authored by Adam Retter on 15 May 2017, 17:45:14 UTC, committed by Facebook Github Bot on 15 May 2017, 18:12:08 UTC
Summary: Closes https://github.com/facebook/rocksdb/issues/2280 Closes https://github.com/facebook/rocksdb/pull/2292 Differential Revision: D5061259 Pulled By: sagar0 fbshipit-source-id: eec89111d114c04beee5870a4eb4b51857754783
1 parent 3fa9a39
concurrent_arena.cc
// 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
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