linux-kernel - [PATCH v3 08/14] bfq: introduce prio_expire flag for bfq

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Message-Id: <31127a6ea5fd65c63e2327d1a4820d948d5a222e.1616649216.git.brookxu@tencent.com>
Date:   Thu, 25 Mar 2021 14:57:52 +0800
From:   brookxu <brookxu.cn@...il.com>
To:     paolo.valente@...aro.org, axboe@...nel.dk, tj@...nel.org
Cc:     linux-block@...r.kernel.org, cgroups@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v3 08/14] bfq: introduce prio_expire flag for bfq_queue

From: Chunguang Xu <brookxu@...cent.com>

When in_service_queue needs to be preempted by task with
a higher priority, we will mark it with prio_expire flag,
and then expire it on the IO dispatch path. Here add
prio_expire flag only.

Signed-off-by: Chunguang Xu <brookxu@...cent.com>
---
 block/bfq-iosched.c | 2 ++
 block/bfq-iosched.h | 2 ++
 2 files changed, 4 insertions(+)

diff --git a/block/bfq-iosched.c b/block/bfq-iosched.c
index e7bc5e2..6e19b5a 100644
--- a/block/bfq-iosched.c
+++ b/block/bfq-iosched.c
@@ -153,6 +153,7 @@
 BFQ_BFQQ_FNS(wait_request);
 BFQ_BFQQ_FNS(non_blocking_wait_rq);
 BFQ_BFQQ_FNS(fifo_expire);
+BFQ_BFQQ_FNS(prio_expire);
 BFQ_BFQQ_FNS(has_short_ttime);
 BFQ_BFQQ_FNS(sync);
 BFQ_BFQQ_FNS(IO_bound);
@@ -2986,6 +2987,7 @@ static void __bfq_set_in_service_queue(struct bfq_data *bfqd,
 {
 	if (bfqq) {
 		bfq_clear_bfqq_fifo_expire(bfqq);
+		bfq_clear_bfqq_prio_expire(bfqq);
 
 		bfqd->budgets_assigned = (bfqd->budgets_assigned * 7 + 256) / 8;
 
diff --git a/block/bfq-iosched.h b/block/bfq-iosched.h
index 674de8b..8af5ac0 100644
--- a/block/bfq-iosched.h
+++ b/block/bfq-iosched.h
@@ -777,6 +777,7 @@ enum bfqq_state_flags {
 				     * without idling the device
 				     */
 	BFQQF_fifo_expire,	/* FIFO checked in this slice */
+	BFQQF_prio_expire,	/* should expire for higher prio queue*/
 	BFQQF_has_short_ttime,	/* queue has a short think time */
 	BFQQF_sync,		/* synchronous queue */
 	BFQQF_IO_bound,		/*
@@ -806,6 +807,7 @@ enum bfqq_state_flags {
 BFQ_BFQQ_FNS(wait_request);
 BFQ_BFQQ_FNS(non_blocking_wait_rq);
 BFQ_BFQQ_FNS(fifo_expire);
+BFQ_BFQQ_FNS(prio_expire);
 BFQ_BFQQ_FNS(has_short_ttime);
 BFQ_BFQQ_FNS(sync);
 BFQ_BFQQ_FNS(IO_bound);
-- 
1.8.3.1