On Thu, Mar 03, 2011 at 02:47:17AM +0100, Xose Vazquez Perez wrote:
Hi Xose,
I leave it up to Stefan W. and Stefan H. to make comments to your
suggestion. Thanks!
Full quote:
> hi,
>
> udev can handle it, as do 60-readahead.rules with read_ahead_kb
> in s390-tools.
>
> change part of this, 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;
> }
>
>
> for this other, 61-scheduler.rules :
>
> #
> # Rules to change the default scheduler to deadline
> # This file should be installed in /etc/udev/rules.d
> #
>
> SUBSYSTEM!="block", GOTO="ra_end"
>
> ACTION!="add", GOTO="ra_end"
> # on device add change the default scheduler to deadline
> KERNEL=="sd*[!0-9]", ATTR{queue/scheduler}="deadline"
> KERNEL=="dasd*[!0-9]", ATTR{queue/scheduler}="deadline"
>
> LABEL="ra_end"
>
>
> simpler, more flexible and less C code.
>
> -thanks-
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