From: Yu Kuai <yukuai3@huawei.com>
To: <hch@infradead.org>, <tj@kernel.org>, <axboe@kernel.dk>
Cc: <cgroups@vger.kernel.org>, <linux-block@vger.kernel.org>,
<linux-kernel@vger.kernel.org>, <yukuai3@huawei.com>,
<yi.zhang@huawei.com>
Subject: [PATCH 2/4] blk-throtl: don't warn in tg_drain_bios()
Date: Sat, 27 Nov 2021 18:10:57 +0800 [thread overview]
Message-ID: <20211127101059.477405-3-yukuai3@huawei.com> (raw)
In-Reply-To: <20211127101059.477405-1-yukuai3@huawei.com>
tg_drain_bios() will iterate until throtl_rb_first() return NULL,
don't warn in such situation.
Signed-off-by: Yu Kuai <yukuai3@huawei.com>
---
block/blk-throttle.c | 11 ++++++-----
1 file changed, 6 insertions(+), 5 deletions(-)
diff --git a/block/blk-throttle.c b/block/blk-throttle.c
index 230e300c5856..25822c88bea1 100644
--- a/block/blk-throttle.c
+++ b/block/blk-throttle.c
@@ -497,12 +497,13 @@ static void throtl_pd_free(struct blkg_policy_data *pd)
}
static struct throtl_grp *
-throtl_rb_first(struct throtl_service_queue *parent_sq)
+throtl_rb_first(struct throtl_service_queue *parent_sq, bool warn)
{
struct rb_node *n;
n = rb_first_cached(&parent_sq->pending_tree);
- WARN_ON_ONCE(!n);
+ if (warn)
+ WARN_ON_ONCE(!n);
if (!n)
return NULL;
return rb_entry_tg(n);
@@ -520,7 +521,7 @@ static void update_min_dispatch_time(struct throtl_service_queue *parent_sq)
{
struct throtl_grp *tg;
- tg = throtl_rb_first(parent_sq);
+ tg = throtl_rb_first(parent_sq, true);
if (!tg)
return;
@@ -1089,7 +1090,7 @@ static int throtl_select_dispatch(struct throtl_service_queue *parent_sq)
if (!parent_sq->nr_pending)
break;
- tg = throtl_rb_first(parent_sq);
+ tg = throtl_rb_first(parent_sq, true);
if (!tg)
break;
@@ -2266,7 +2267,7 @@ static void tg_drain_bios(struct throtl_service_queue *parent_sq)
{
struct throtl_grp *tg;
- while ((tg = throtl_rb_first(parent_sq))) {
+ while ((tg = throtl_rb_first(parent_sq, false))) {
struct throtl_service_queue *sq = &tg->service_queue;
struct bio *bio;
--
2.31.1
next prev parent reply other threads:[~2021-11-27 10:01 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-11-27 10:10 [PATCH 0/4] cancel all throttled bios in del_gendisk() Yu Kuai
2021-11-27 10:10 ` [PATCH 1/4] Revert "blk-throttle: remove tg_drain_bios" Yu Kuai
2021-11-29 11:45 ` Christoph Hellwig
2021-11-27 10:10 ` Yu Kuai [this message]
2021-11-29 11:46 ` [PATCH 2/4] blk-throtl: don't warn in tg_drain_bios() Christoph Hellwig
2021-11-27 10:10 ` [PATCH 3/4] blk-throtl: introduce blk_throtl_cancel_bios() Yu Kuai
2021-11-29 11:47 ` Christoph Hellwig
2021-11-29 13:58 ` yukuai (C)
2021-11-27 10:10 ` [PATCH 4/4] block: cancel all throttled bios in del_gendisk() Yu Kuai
-- strict thread matches above, loose matches on Subject: below --
2021-09-22 12:51 [PATCH 0/4] cancel all throttled bios in blk_cleanup_queue() Yu Kuai
2021-09-22 12:51 ` [PATCH 2/4] blk-throtl: don't warn in tg_drain_bios() Yu Kuai
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