1// Copyright 2015 The etcd Authors 2// 3// Licensed under the Apache License, Version 2.0 (the "License"); 4// you may not use this file except in compliance with the License. 5// You may obtain a copy of the License at 6// 7// http://www.apache.org/licenses/LICENSE-2.0 8// 9// Unless required by applicable law or agreed to in writing, software 10// distributed under the License is distributed on an "AS IS" BASIS, 11// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12// See the License for the specific language governing permissions and 13// limitations under the License. 14 15package backend 16 17import ( 18 "syscall" 19 20 bolt "go.etcd.io/bbolt" 21) 22 23// syscall.MAP_POPULATE on linux 2.6.23+ does sequential read-ahead 24// which can speed up entire-database read with boltdb. We want to 25// enable MAP_POPULATE for faster key-value store recovery in storage 26// package. If your kernel version is lower than 2.6.23 27// (https://github.com/torvalds/linux/releases/tag/v2.6.23), mmap might 28// silently ignore this flag. Please update your kernel to prevent this. 29var boltOpenOptions = &bolt.Options{ 30 MmapFlags: syscall.MAP_POPULATE, 31 NoFreelistSync: true, 32} 33 34func (bcfg *BackendConfig) mmapSize() int { return int(bcfg.MmapSize) } 35