Kernel Study Notes

0.1. This question should be divided into two parts. 0.1.1. Part 1: adding a route0.1.1.1. Add a direct(link) route0.1.1.2. Add a route with gateway0.1.2. create a socket0.1.2.1. for example ‘connect’

0.0.1. call trace以handle_level_irq为例说明. 1234===> handle_level_irq==> ==> handle_irq_event==> ==> ==> handle_irq_event_percpu==> ==> ==> ==>action->handler 0.0.1.1. wh

0.0.1. 中断处理过程：0.0.1.1. 硬件中断到中断控制器reg value–>irq(int) —> struct irq_desc 123456==> 中断时的有一个寄存器会保存中断源的vector值.==> ==> `arch/x86/kernel/entry_64.S`调用函数`do_IRQ`.==> ==> ==> `do_IRQ`

0.0.1. 中断处理过程：reg value–>irq(int) —> struct irq_desc 123456==> 中断时的有一个寄存器会保存中断源的vector值.==> ==> `arch/x86/kernel/entry_64.S`调用函数`do_IRQ`.==> ==> ==> `do_IRQ`依据`vector_irq`和vect

0.0.1. summaryA delayed work will first start a timer,and when timeout, the delayed work will be put a worker_pool‘sworklist or a pool_workqueue‘s delayed_works 0.0.2. how to use delayed work0.0.2.1.

0.0.1. Defination12345678910141 /* struct worker is defined in workqueue_internal.h */142143 struct worker_pool {...173 /*174 * The current concurrency level. As it's likel

0.0.1. SummaryThe struct worker is the really scheudle unit in workqueue.Each struct worker has a corresponding thread(task) by worker->task.A struct worker is linked to struct worker_pool->idle

0.0.1. summary

0.0.1. dst garbage summarygarbage collection is a common method used in kernel.When a object(struct,memeory) become invalid, we needfree them, but the object maybe reference by others. such as a dst_e

0.0.1. Call traceforward a packet. 123456> ip_rcv_finish> > ip_route_input_noref> > > ip_route_input_slow > > > > fib_lookup > > > > ip_mkroute_input> >