From: Yu Kuai <yukuai3@huawei.com>
To: <axboe@kernel.dk>
Cc: <linux-block@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
<yukuai3@huawei.com>, <yi.zhang@huawei.com>,
<zhangxiaoxu5@huawei.com>
Subject: [PATCH 0/3] fix the performance fluctuation due to shared tagset
Date: Sat, 26 Dec 2020 18:28:05 +0800 [thread overview]
Message-ID: <20201226102808.2534966-1-yukuai3@huawei.com> (raw)
The problem is due to the max number of avaliable tags is
max(total tags / active_queues, 4).
We fix it by ensuring the following:
a. don't restrict if the utilization rate of total tags is less than
100%
b. if the utilization rate of total tags is 100%, and someone failed
to get driver tag, start to restrict as before.
b. if the utilization rate of total tags goes below 100%, it can
stop to restrict quickly.
Yu Kuai (3):
blk-mq: allow hardware queue to get more tag while sharing a tag set
blk-mq: clear 'active_queues' immediately when 'nr_active' is
decreased to 0
blk-mq: decrease pending_queues when it expires
block/blk-mq-debugfs.c | 2 ++
block/blk-mq-tag.c | 61 +++++++++++++++++++++++++++++++++++++++++-
block/blk-mq-tag.h | 23 ++++++++++++++++
block/blk-mq.c | 9 +++++--
block/blk-mq.h | 11 +++++---
include/linux/blk-mq.h | 10 ++++++-
include/linux/blkdev.h | 1 +
7 files changed, 110 insertions(+), 7 deletions(-)
--
2.25.4
next reply other threads:[~2020-12-26 10:26 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-26 10:28 Yu Kuai [this message]
2020-12-26 10:28 ` [PATCH 1/3] blk-mq: allow hardware queue to get more tag while sharing a tag set Yu Kuai
2020-12-27 11:58 ` Ming Lei
2020-12-28 1:56 ` yukuai (C)
2020-12-28 8:28 ` Ming Lei
2020-12-28 9:02 ` yukuai (C)
2020-12-29 1:15 ` Ming Lei
2020-12-29 2:37 ` yukuai (C)
2020-12-26 10:28 ` [PATCH 2/3] blk-mq: clear 'active_queues' immediately when 'nr_active' is decreased to 0 Yu Kuai
2020-12-26 10:28 ` [PATCH 3/3] blk-mq: decrease pending_queues when it expires Yu Kuai
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