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blk-mq: Reorder fields in 'struct blk_mq_tag_set'

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Group some variables based on their sizes to reduce hole and avoid padding.
On x86_64, this shrinks the size of 'struct blk_mq_tag_set'
from 304 to 296 bytes.

Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Link: https://lore.kernel.org/r/6f249f9b02a3490283ef0278096556de41aa0cf0.1676626130.git.christophe.jaillet@wanadoo.fr
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christophe JAILLET 2023-02-17 10:29:10 +01:00 committed by Jens Axboe
parent e5cfefa97b
commit d88cbbb39b
1 changed files with 2 additions and 2 deletions
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4
include/linux/blk-mq.h
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@ -473,6 +473,7 @@ enum hctx_type {
/**
* struct blk_mq_tag_set - tag set that can be shared between request queues
* @ops: Pointers to functions that implement block driver behavior.
* @map: One or more ctx -> hctx mappings. One map exists for each
* hardware queue type (enum hctx_type) that the driver wishes
* to support. There are no restrictions on maps being of the
@ -480,7 +481,6 @@ enum hctx_type {
* types.
* @nr_maps: Number of elements in the @map array. A number in the range
* [1, HCTX_MAX_TYPES].
* @ops: Pointers to functions that implement block driver behavior.
* @nr_hw_queues: Number of hardware queues supported by the block driver that
* owns this data structure.
* @queue_depth: Number of tags per hardware queue, reserved tags included.
@ -505,9 +505,9 @@ enum hctx_type {
* (BLK_MQ_F_BLOCKING).
*/
struct blk_mq_tag_set {
const struct blk_mq_ops *ops;
struct blk_mq_queue_map map[HCTX_MAX_TYPES];
unsigned int nr_maps;
const struct blk_mq_ops *ops;
unsigned int nr_hw_queues;
unsigned int queue_depth;
unsigned int reserved_tags;