hugetlb_sysctl_handler 20 include/linux/hugetlb.h int hugetlb_sysctl_handler(struct ctl_table *, int, struct file *, void __user *, size_t *, loff_t *); hugetlb_sysctl_handler 954 kernel/sysctl.c .proc_handler = &hugetlb_sysctl_handler,