linux-kernel - [PATCH BUGFIX/IMPROVEMENT 5/6] block, bfq: save also injection state on queue merging

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Message-Id: <20210125190248.49338-6-paolo.valente@linaro.org>
Date:   Mon, 25 Jan 2021 20:02:47 +0100
From:   Paolo Valente <paolo.valente@...aro.org>
To:     Jens Axboe <axboe@...nel.dk>
Cc:     linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        Paolo Valente <paolo.valente@...aro.org>,
        Jan Kara <jack@...e.cz>
Subject: [PATCH BUGFIX/IMPROVEMENT 5/6] block, bfq: save also injection state on queue merging

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@...e.cz>
Signed-off-by: Paolo Valente <paolo.valente@...aro.org>
---
 block/bfq-iosched.c | 8 ++++++++
 block/bfq-iosched.h | 5 +++++
 2 files changed, 13 insertions(+)

diff --git a/block/bfq-iosched.c b/block/bfq-iosched.c
index 56ad6067d41d..e56ee60df014 100644
--- a/block/bfq-iosched.c
+++ b/block/bfq-iosched.c
@@ -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);
diff --git a/block/bfq-iosched.h b/block/bfq-iosched.h
index d15299d59f89..3f350fa3c5fd 100644
--- a/block/bfq-iosched.h
+++ b/block/bfq-iosched.h
@@ -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;
 };
 
 /**
-- 
2.20.1