callback notify when add a IPv4 add
0.1. summaryIP4 route register a call back notify in IPv4 address.When a address is added, fib_inetaddr_event will be called. and then 4 route entry maybe added in fib_add_ifaddr
Kernel Study Notes
how kernel add a IPv4 address
0.1. SUMMARYThere is a struct in_device __rcu *ip_ptr under every net_device.which stores all the IPv4 related information for this device. Each IPv4 address is stored a struct in_ifaddr,all the IPv4
unregister a net device
unregister_netdev is used to delete a net device. In fact, it equals: 1234rtnl_lock();rollback_registered_many( a temp list with a single net device);list_add_tail(&dev->todo_list, &net_tod
draft: how to select a realtime task when schedule
0.1. summaryThere is a struct rt_rq in struct rq. struct rt_rq is used to store allthe realtime task in current struct rq. which has a struct rt_prio_array active.
draft: how to pick next task
0.1. summaryThere are four sched_class,stop_sched_class --> rt_sched_class --> fair_sched_class --> idle_sched_class They are linked one by one staticly by struct sched_class->next by thei
draft: struct rq
0.1. summary: struct rq is basic data structure. there is a realtime process(es) and normal process(es) are stored indifferent sub-runqueue *_rq of rq? 12426 struct cfs_rq cfs;427 st
draft: isolcpus
Isolcpus 0.1. kthread has wrong affinity when use isolcpus in bootlinewhen boot kernel with isolcpus in grub command lines, only init thread has expected affinity, which exclude the isolated cpus. whi
How Kernel Thread Is Created
JUN 27TH, 2013 | COMMENTSHow to create a kernel thread 0.1. create a kthread by kthread_createkthread_create(threadfn, data, namefmt, arg...) example: file drivers/char/apm-emulation.c 1651