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Linux I/O????????Linux????????????????????????????????????????????????I/O???????????????????Block I/O?????????????ext4????????????I/O?????

???????????????Linux I/O??????????????I/O???I/O????????????????????

????????Linux I/O??????????????I/O?select?epoll??????????Signal IO???IO????

?????????????????VFS?????????????????????inode???????????????????????????icache?dcache?slab shrink??????

????????EXT2/3/4??????????????????????????????????fsck?????????????

???????I/O???I/O?????????IO?????page cache?bio?request?????????O_DIRECT?O_SYNC???blktrace????CFQ?ionice?I/O???????????cgroup?IO?????iotop?iostat?

???????????????????????????????????3?25???333???????3?25??388?????????????????????????

???????+????????????????????????????????????????????????????????????????

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