linux-kernel - [PATCH -next v2 0/2] block, bfq: make bfq_has

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Message-ID: <20220513023507.2625717-1-yukuai3@huawei.com>
Date:   Fri, 13 May 2022 10:35:05 +0800
From:   Yu Kuai <yukuai3@...wei.com>
To:     <jack@...e.cz>, <paolo.valente@...aro.org>, <axboe@...nel.dk>
CC:     <linux-block@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <yukuai3@...wei.com>, <yi.zhang@...wei.com>
Subject: [PATCH -next v2 0/2] block, bfq: make bfq_has_work() more accurate

Changes in v2:
 - add reviewed-by tag for patch 1
 - use WRITE_ONCE() for updating of 'bfqd->queued' in patch 2

This patchset try to make bfq_has_work() more accurate, patch 1 is a
small problem found by code review.

BTW, I not sure why blk_mq_run_hw_queues() is called with 'bfqd->lock'
held, I think this is not necessary. And bfq_has_work() can be more
accurate by reading 'bfqd->queued' with 'bfqd->lock' held after patch 2.

Previous versions:
v1: https://lore.kernel.org/all/20220510131629.1964415-1-yukuai3@huawei.com/

Yu Kuai (2):
  block, bfq: protect 'bfqd->queued' by 'bfqd->lock'
  block, bfq: make bfq_has_work() more accurate

 block/bfq-iosched.c | 20 +++++++++++++++-----
 1 file changed, 15 insertions(+), 5 deletions(-)

-- 
2.31.1