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block, bfq: save also injection state on queue merging

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To prevent injection information from being lost on bfq_queue merging,
also the amount of service that a bfq_queue receives must be saved and
restored when the bfq_queue is merged and split, respectively.

Tested-by: Jan Kara <jack@suse.cz>
Signed-off-by: Paolo Valente <paolo.valente@linaro.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Paolo Valente 2021-01-25 20:02:47 +01:00 committed by Jens Axboe
parent e673914d52
commit 5a5436b98d
2 changed files with 13 additions and 0 deletions
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8
block/bfq-iosched.c
View file

@ -1024,6 +1024,10 @@ bfq_bfqq_resume_state(struct bfq_queue *bfqq, struct bfq_data *bfqd,
else
bfq_clear_bfqq_IO_bound(bfqq);
bfqq->last_serv_time_ns = bic->saved_last_serv_time_ns;
bfqq->inject_limit = bic->saved_inject_limit;
bfqq->decrease_time_jif = bic->saved_decrease_time_jif;
bfqq->entity.new_weight = bic->saved_weight;
bfqq->ttime = bic->saved_ttime;
bfqq->io_start_time = bic->saved_io_start_time;
@ -2748,6 +2752,10 @@ static void bfq_bfqq_save_state(struct bfq_queue *bfqq)
if (!bic)
return;
bic->saved_last_serv_time_ns = bfqq->last_serv_time_ns;
bic->saved_inject_limit = bfqq->inject_limit;
bic->saved_decrease_time_jif = bfqq->decrease_time_jif;
bic->saved_weight = bfqq->entity.orig_weight;
bic->saved_ttime = bfqq->ttime;
bic->saved_has_short_ttime = bfq_bfqq_has_short_ttime(bfqq);

5
block/bfq-iosched.h
View file

@ -444,6 +444,11 @@ struct bfq_io_cq {
unsigned long saved_wr_start_at_switch_to_srt;
unsigned int saved_wr_cur_max_time;
struct bfq_ttime saved_ttime;
/* Save also injection state */
u64 saved_last_serv_time_ns;
unsigned int saved_inject_limit;
unsigned long saved_decrease_time_jif;
};
/**