linux-kernel - Question about request queues in I/O scheduling

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Message-ID: <571D1390.6060204@gmail.com>
Date:	Sun, 24 Apr 2016 21:42:24 +0300
From:	Max Kanushin <rextuz@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: Question about request queues in I/O scheduling

Hello,

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?

Please make a personal CC for me. I will really appreciate your help.
Best regards

   Max Kanushin.