From: Tao Cui <cui.tao@linux.dev>
To: "Yu Kuai" <yukuai@kernel.org>, "Jens Axboe" <axboe@kernel.dk>,
"Tejun Heo" <tj@kernel.org>, "Josef Bacik" <josef@toxicpanda.com>,
"Johannes Weiner" <hannes@cmpxchg.org>,
"Michal Koutný" <mkoutny@suse.com>
Cc: cui.tao@linux.dev, Yu Kuai <yukuai@fygo.io>,
Christoph Hellwig <hch@lst.de>, Jan Kara <jack@suse.cz>,
Ming Lei <ming.lei@redhat.com>, Jonathan Corbet <corbet@lwn.net>,
Shuah Khan <skhan@linuxfoundation.org>, Coly Li <colyli@fygo.io>,
Kent Overstreet <kent.overstreet@linux.dev>,
Alasdair Kergon <agk@redhat.com>,
Mike Snitzer <snitzer@kernel.org>,
Mikulas Patocka <mpatocka@redhat.com>,
Benjamin Marzinski <bmarzins@redhat.com>,
Song Liu <song@kernel.org>, Li Nan <magiclinan@didiglobal.com>,
Xiao Ni <xiao@kernel.org>,
Pankaj Gupta <pankaj.gupta.linux@gmail.com>,
Dan Williams <djbw@kernel.org>,
Vishal Verma <vishal.l.verma@intel.com>,
Dave Jiang <dave.jiang@intel.com>,
Alison Schofield <alison.schofield@intel.com>,
Ira Weiny <iweiny@kernel.org>,
Andreas Gruenbacher <agruenba@redhat.com>,
Matthew Wilcox <willy@infradead.org>,
Andrew Morton <akpm@linux-foundation.org>,
Chris Li <chrisl@kernel.org>, Kairui Song <kasong@tencent.com>,
Kemeng Shi <shikemeng@huaweicloud.com>,
Nhat Pham <nphamcs@gmail.com>, Baoquan He <baoquan.he@linux.dev>,
Barry Song <baohua@kernel.org>,
Youngjun Park <youngjun.park@lge.com>,
cgroups@vger.kernel.org, linux-doc@vger.kernel.org,
linux-kernel@vger.kernel.org, linux-block@vger.kernel.org,
linux-bcache@vger.kernel.org, dm-devel@lists.linux.dev,
linux-raid@vger.kernel.org, nvdimm@lists.linux.dev,
virtualization@lists.linux.dev, gfs2@lists.linux.dev,
linux-fsdevel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [RFC PATCH v3 3/3] blk-cgroup: move async bio punt state to blkcg
Date: Thu, 20 Aug 2026 17:58:58 +0800 [thread overview]
Message-ID: <7b2733a4-71d2-43bb-b319-1ca8defba17e@linux.dev> (raw)
In-Reply-To: <20260818070641.756747-4-yukuai@kernel.org>
在 2026/8/18 15:06, Yu Kuai 写道:
> blkcg_punt_bio_submit() currently queues punted bios on blkg->async_bios,
> so it has to call bio_blkg() to find or create a queue-local blkg. Bios
> now carry and pin the blkcg css, so punted bio lifetime no longer needs to
> be anchored by a blkg.
>
> Keeping the punt state in blkg can instantiate a blkg even when no blkcg
> policy is enabled, just to bounce submission from a shared kthread. Move
> async_bio_lock, async_bios and async_bio_work to struct blkcg, and queue
> punted bios on bio_blkcg() for non-root cgroups. Root or unassociated bios
> are submitted directly.
>
> This preserves the priority-inversion avoidance while preventing
> blkcg_punt_bio_submit() from creating blkgs that are not needed by any
> policy.
Reviewed-by: Tao Cui <cuitao@kylinos.cn>
next prev parent reply other threads:[~2026-08-20 9:59 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-08-18 7:06 [RFC PATCH v3 0/3] blk-cgroup: store blkcg in bio before blkcg_mutex conversion Yu Kuai
2026-08-18 7:06 ` [RFC PATCH v3 1/3] blk-cgroup: use a request_queue rhashtable for blkg lookup Yu Kuai
2026-08-19 9:14 ` Christoph Hellwig
2026-08-20 9:57 ` Tao Cui
2026-08-18 7:06 ` [RFC PATCH v3 2/3] blk-cgroup: store blkcg in bio instead of blkg Yu Kuai
2026-08-19 9:14 ` Christoph Hellwig
2026-08-20 9:58 ` Tao Cui
2026-08-18 7:06 ` [RFC PATCH v3 3/3] blk-cgroup: move async bio punt state to blkcg Yu Kuai
2026-08-19 9:15 ` Christoph Hellwig
2026-08-20 9:58 ` Tao Cui [this message]
2026-08-20 6:01 ` [RFC PATCH v3 0/3] blk-cgroup: store blkcg in bio before blkcg_mutex conversion Shin'ichiro Kawasaki
2026-08-20 7:39 ` yu kuai
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