linux-kernel - [PATCH 0/3] blk-ioc: convert ioc_lookup

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Message-Id: <20250725070547.3953398-1-yukuai1@huaweicloud.com>
Date: Fri, 25 Jul 2025 15:05:44 +0800
From: Yu Kuai <yukuai1@...weicloud.com>
To: jack@...e.cz,
	dlemoal@...nel.org,
	axboe@...nel.dk
Cc: linux-block@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	yukuai3@...wei.com,
	yukuai1@...weicloud.com,
	yi.zhang@...wei.com,
	yangerkun@...wei.com,
	johnny.chenyi@...wei.com
Subject: [PATCH 0/3] blk-ioc: convert ioc_lookup_icq() to lockless version

From: Yu Kuai <yukuai3@...wei.com>

Currently issue io can grab queue_lock three times from bfq_bio_merge(),
bfq_limit_depth() and bfq_prepare_request(), the queue_lock is not
necessary if icq is already created because both queue and ioc can't be
freed before io issuing is done.

This set first add a lockless helper ioc_lookup_icq_rcu() and then
covert to use the new helper.

Noted this is also a prep set to support request batch dispatching[1].

1. https://lore.kernel.org/all/20250722072431.610354-1-yukuai1@huaweicloud.com/

Yu Kuai (3):
  blk-ioc: add a new helper ioc_lookup_icq_rcu()
  block, bfq: convert to use ioc_lookup_icq_rcu()
  blk-ioc: convert to use ioc_lookup_icq_rcu()

 block/bfq-iosched.c | 23 ++++++-----------------
 block/blk-ioc.c     | 46 ++++++++++++++++++++++-----------------------
 block/blk.h         |  2 +-
 3 files changed, 29 insertions(+), 42 deletions(-)

-- 
2.39.2