TCP与Epoll内核睡眠唤醒时序流程

3

epoll_filefd

+ file : struct file+ fd : int

这是模板水印，可删除

server

sock

+ sk_wq : struct socket_wq*

TCP_NEW_SYN_RECV

ep_send_events

SYN

epoll_wait

socket

seq = x

tail

ACK

TCP_SYN_SENT

rbr

1

TCP_CLOSE

epoll_ctl

8

new socket

7

wake_up_locked(&ep->wq);

epi

tcp_poll

__add_wait_queue_exclusive

TASK_RUNNING

accept

2

eppoll_entry

base : struct epitem*llink : struct list_head whead : wait_queue_head_t *wait : wait_queue_entry_t 

ep_poll_callback

wake_up_interruptible_all

w2

ep_pqueue

+ pt : poll_table+ epi : epitem*

TASK_INTERRUPTIBLE

5

9

6

4

driver

TCP_SYN_RECV

wait_queue_entry

entry : struct list_headfunc : wait_queue_func_t 

__remove_wait_queue

TCP_ESTABLISHED

+ file ：struct file*+ wq : struct socket_wq+ sk : struct sock*

epitem

head

tcp_v4_rcv

eventpoll

+ wq : wait_queue_head_t+ rdllist : list_head+ rbr : rb_root_cached+ file : file*

ep_ptable_queue_proc

wait_queue_head

+ lock : spinlock_t+ head : struct list_head

bind

connect

半连接队列

sock_def_wakeup

client

epoll_create

task_struct

+ files : struct files_struct *

listen

socket_wq

+ wait : wait_queue_head_t

sleep

全连接队列

schedule_hrtimeout_range

wenfh2020.comLinux 5.0.1

ep_item_poll

wakeup

SYN+ACK

w1

poll_table

+ _key : __poll_t+ _qproc : poll_queue_proc

ack = y + 1

ep_insert

TCP_LISTEN