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 15 package backend 16 17 import ( 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. 29 var boltOpenOptions = &bolt.Options{ 30 MmapFlags: syscall.MAP_POPULATE, 31 NoFreelistSync: true, 32 } 33 34 func (bcfg *BackendConfig) mmapSize() int { return int(bcfg.MmapSize) } 35