redis - 尽管 THP 已被禁用，但我不断收到有关 THP 的警告

Question

每次我重新启动我的服务器时，我总是从 redis 收到这个错误:

WARNING you have Transparent Huge Pages (THP) support enabled in your kernel. This will create latency and memory usage issues with Redis. To fix this issue run the command 'echo never > /sys/kernel/mm/transparent_hugepage/enabled' as root, and add it to your /etc/rc.local in order to retain the setting after a reboot. Redis must be restarted after THP is disabled.

当我执行此命令时 sudo sysctl -a | grep hugepage，结果为:

vm.hugepages_treat_as_movable = 0
vm.nr_hugepages = 0
vm.nr_hugepages_mempolicy = 0
vm.nr_overcommit_hugepages = 0

# cat /sys/kernel/mm/transparent_hugepage/enabled
always madvise [never]

为什么我总是收到这个错误？

$ cat /etc/rc.local

if test -f /sys/kernel/mm/transparent_hugepage/enabled; then
   echo never > /sys/kernel/mm/transparent_hugepage/enabled
fi

if test -f /sys/kernel/mm/transparent_hugepage/defrag; then
   echo never > /sys/kernel/mm/transparent_hugepage/defrag
fi

exit 0`

Answer 1

一不小心，我把redis从3.0升级到3.2后修复了