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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
Message-ID: <20201226102808.2534966-1-yukuai3@huawei.com>
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| Series |
fix the performance fluctuation due to shared tagset
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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(-)