今天在xen虚拟机的/etc/sysctl.conf
cat /etc/sysctl.conf | grep -i huge
vm.nr_hugepages=189440
vm.nr_overcommit_hugepages = 7500

然后运行sysctl -p使之生效的时候碰到了如下错误
sysctl: setting key “vm.nr_hugepages”: Operation not supported
vm.nr_hugepages = 189440
sysctl: setting key “vm.nr_overcommit_hugepages”: Operation not supported
vm.nr_overcommit_hugepages = 7500

结论 xen虚拟机不支持hugepage