blob: f712671af4405aa81d068cbe432bc0239b08d67b [file] [log] [blame]
khenaidooab1f7bd2019-11-14 14:00:27 -05001// 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) }