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Epoll - from the kernel side

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The document discusses the basics of I/O and event-driven I/O models in Linux like blocking I/O, non-blocking I/O, I/O multiplexing using select/poll and their internals. It then introduces epoll as a more efficient alternative to select/poll and describes its user-space API, kernel structures and how it works by adding file descriptors to an epoll instance and waking up blocked processes on I/O events.

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Epoll - From the kernel side ,[object Object],[object Object],[object Object]
Some basics about I/O ,[object Object],[object Object]
Some basics about I/O ,[object Object],[object Object],[object Object],[object Object]
Some basics about I/O ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
I/O models – back to software world ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
NON/Blocking I/O ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
IO-Multiplex  ,[object Object],[object Object],[object Object],[object Object]
SELECT/POLL Internals - basics ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
SELECT/POLL Internals - basics
SELECT/POLL Internals - basics ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
SELECT/POLL Internals – basics ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
SELECT/POLL Internals - some basics ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
SELECT/POLL Internals ,[object Object],[object Object]
SELECT/POLL Internals -- tcp_poll ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Here Comes the EPOLL ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Epoll code demo  ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
EPOLL Internals ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
EPOLL Internals ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
EPOLL Internals ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
EPOLL Internals - how to sleep ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
epoll Internals - how to wakeup  ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
EPOLL Internal - show to wakeup  ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
EPOLL the whole picture ,[object Object],[object Object],[object Object]
Compare to the IOCP ,[object Object],[object Object],[object Object],[object Object]
References ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
References ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

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Epoll - from the kernel side

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Editor's Notes

  1. Picture borrow from Robert love - linux kernel development