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block, bfq: Reorder struct bfq_iocq_bfqq_data

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The size of struct bfq_iocq_bfqq_data can be reduced by moving a few
fields around.

On a x86_64, with allmodconfig, this shrinks the size from 144 to 128
bytes. The main benefit is to reduce the size of struct bfq_io_cq from
1360 to 1232.

This structure is stored in a dedicated slab cache. So reducing its size
improves cache usage.

Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Reviewed-by: Yu Kuai <yukuai3@huawei.com>
Link: https://lore.kernel.org/r/79394db1befaa658e8066b8e3348073ce27d9d26.1754119538.git.christophe.jaillet@wanadoo.fr
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christophe JAILLET 2025-08-02 09:25:59 +02:00 committed by Jens Axboe
parent 984ff00c65
commit 407728da41
1 changed files with 5 additions and 5 deletions
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10
block/bfq-iosched.h
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@ -427,9 +427,6 @@ struct bfq_iocq_bfqq_data {
*/
bool saved_IO_bound;
u64 saved_io_start_time;
u64 saved_tot_idle_time;
/*
* Same purpose as the previous fields for the values of the
* field keeping the queue's belonging to a large burst
@ -450,6 +447,9 @@ struct bfq_iocq_bfqq_data {
*/
unsigned int saved_weight;
u64 saved_io_start_time;
u64 saved_tot_idle_time;
/*
* Similar to previous fields: save wr information.
*/
@ -457,13 +457,13 @@ struct bfq_iocq_bfqq_data {
unsigned long saved_last_wr_start_finish;
unsigned long saved_service_from_wr;
unsigned long saved_wr_start_at_switch_to_srt;
unsigned int saved_wr_cur_max_time;
struct bfq_ttime saved_ttime;
unsigned int saved_wr_cur_max_time;
/* Save also injection state */
u64 saved_last_serv_time_ns;
unsigned int saved_inject_limit;
unsigned long saved_decrease_time_jif;
u64 saved_last_serv_time_ns;
/* candidate queue for a stable merge (due to close creation time) */
struct bfq_queue *stable_merge_bfqq;