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Commit 3c5820c7 authored by Martin K. Petersen's avatar Martin K. Petersen Committed by Jens Axboe
Browse files

block: Optimal I/O limit wrapper 



Implement blk_limits_io_opt() and make blk_queue_io_opt() a wrapper
around it. DM needs this to avoid poking at the queue_limits directly.

Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: default avatarMike Snitzer <snitzer@redhat.com>
Signed-off-by: default avatarJens Axboe <jens.axboe@oracle.com>
parent 06d21886

block/blk-settings.c

+20 −1
Original line number Diff line number Diff line
@@ -427,6 +427,25 @@ void blk_queue_io_min(struct request_queue *q, unsigned int min) 
}

EXPORT_SYMBOL(blk_queue_io_min);



/**

 * blk_limits_io_opt - set optimal request size for a device

 * @limits: the queue limits

 * @opt:  smallest I/O size in bytes

 *

 * Description:

 *   Storage devices may report an optimal I/O size, which is the

 *   device's preferred unit for sustained I/O.  This is rarely reported

 *   for disk drives.  For RAID arrays it is usually the stripe width or

 *   the internal track size.  A properly aligned multiple of

 *   optimal_io_size is the preferred request size for workloads where

 *   sustained throughput is desired.

 */

void blk_limits_io_opt(struct queue_limits *limits, unsigned int opt)

{

	limits->io_opt = opt;

}

EXPORT_SYMBOL(blk_limits_io_opt);



/**

 * blk_queue_io_opt - set optimal request size for the queue

 * @q:	the request queue for the device
@@ -442,7 +461,7 @@ EXPORT_SYMBOL(blk_queue_io_min); 
 */

void blk_queue_io_opt(struct request_queue *q, unsigned int opt)

{

	q->limits.io_opt = opt;

	blk_limits_io_opt(&q->limits, opt);

}

EXPORT_SYMBOL(blk_queue_io_opt);

drivers/md/dm-stripe.c

+1 −1
Original line number Diff line number Diff line
@@ -336,7 +336,7 @@ static void stripe_io_hints(struct dm_target *ti, 
	unsigned chunk_size = (sc->chunk_mask + 1) << 9;



	blk_limits_io_min(limits, chunk_size);

	limits->io_opt = chunk_size * sc->stripes;

	blk_limits_io_opt(limits, chunk_size * sc->stripes);

}



static struct target_type stripe_target = {

include/linux/blkdev.h

+1 −0
Original line number Diff line number Diff line
@@ -935,6 +935,7 @@ extern void blk_queue_alignment_offset(struct request_queue *q, 
				       unsigned int alignment);

extern void blk_limits_io_min(struct queue_limits *limits, unsigned int min);

extern void blk_queue_io_min(struct request_queue *q, unsigned int min);

extern void blk_limits_io_opt(struct queue_limits *limits, unsigned int opt);

extern void blk_queue_io_opt(struct request_queue *q, unsigned int opt);

extern void blk_set_default_limits(struct queue_limits *lim);

extern int blk_stack_limits(struct queue_limits *t, struct queue_limits *b,