CODEWITHSUNDEEP
clinux-kernel
Maksim
Maksim

Reputation: 185

Request queues in I/O scheduling Linux Kernel

I was searching for a way to find out the length of a request_queue (that is defined as a structure in linux/include/linux/blkdev.h). However I am new to the kernel development and can't figure out where is the actual list of requests to be processed by an elevator. Is there a way to iterate requests in a queue or at least find a number of them?

Upvotes: 0

Views: 295

Answers (1)

fluter
fluter

Reputation: 13786

The requests of a queue are linked by struct list_head queue_head. You can iterating all the request using the linked list functions, you can see some examples here:

http://lxr.free-electrons.com/source/include/linux/blkdev.h?v=2.4.37#L271

Upvotes: 1

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