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Date: Wed, 5 May 2010 08:16:20 +0200
From: Heiko Carstens <heiko.carstens@...ibm.com>
To: Xose Vazquez Perez <xose.vazquez@...il.com>,
Stefan Weinhuber <wein@...ibm.com>,
Horst Hummel <Horst.Hummel@...ibm.com>,
Stefan Haberland <stefan.haberland@...ibm.com>
Cc: linux-s390@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: deadline ALWAYS default for dasd devices(s390) ?
On Mon, Apr 26, 2010 at 02:34:16PM +0200, Xose Vazquez Perez wrote:
> hi,
>
> why is it FORCED ? bypassing a GLOBAL setting and also the kernel command line !!!
>
> drivers/s390/block/dasd.c
>
> /*
> * Allocate and initialize request queue and default I/O scheduler.
> */
> static int dasd_alloc_queue(struct dasd_block *block)
> {
> int rc;
>
> block->request_queue = blk_init_queue(do_dasd_request,
> &block->request_queue_lock);
> if (block->request_queue == NULL)
> return -ENOMEM;
>
> block->request_queue->queuedata = block;
>
> elevator_exit(block->request_queue->elevator);
> block->request_queue->elevator = NULL;
> rc = elevator_init(block->request_queue, "deadline");
> if (rc) {
> blk_cleanup_queue(block->request_queue);
> return rc;
> }
> return 0;
> }
Horst, Stefan W. or Stefan H. should be able to answer your question.
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