Seastar
High performance C++ framework for concurrent servers
cacheline.hh
1/*
2 * This file is open source software, licensed to you under the terms
3 * of the Apache License, Version 2.0 (the "License"). See the NOTICE file
4 * distributed with this work for additional information regarding copyright
5 * ownership. You may not use this file except in compliance with the License.
6 *
7 * You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing,
12 * software distributed under the License is distributed on an
13 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
14 * KIND, either express or implied. See the License for the
15 * specific language governing permissions and limitations
16 * under the License.
17 */
18/*
19 * Copyright (C) 2017 IBM.
20 */
21
22#pragma once
23
24#ifndef SEASTAR_MODULE
25#include <cstddef>
26#include <seastar/util/modules.hh>
27#endif
28
29namespace seastar {
30
31SEASTAR_MODULE_EXPORT_BEGIN
32
33// Platform-dependent cache line size for alignment and padding purposes.
34constexpr size_t cache_line_size =
35#if defined(__x86_64__) || defined(__i386__)
36 64;
37#elif defined(__s390x__) || defined(__zarch__)
38 256;
39#elif defined(__PPC64__)
40 128;
41#elif defined(__aarch64__)
42 128; // from Linux, may vary among different microarchitetures?
43#else
44#error "cache_line_size not defined for this architecture"
45#endif
46
47SEASTAR_MODULE_EXPORT_END
48
49}
Seastar API namespace.
Definition: abort_on_ebadf.hh:26