From: Christoph Hellwig <hch@lst.de>
To: yu kuai <yukuai@fygo.io>
Cc: "Christoph Hellwig" <hch@lst.de>, "Jens Axboe" <axboe@kernel.dk>,
"Josef Bacik" <josef@toxicpanda.com>, "Tejun Heo" <tj@kernel.org>,
"Johannes Weiner" <hannes@cmpxchg.org>,
"Michal Koutný" <mkoutny@suse.com>,
"Jonathan Corbet" <corbet@lwn.net>,
"Shuah Khan" <skhan@linuxfoundation.org>,
"Randy Dunlap" <rdunlap@infradead.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>,
"Andreas Gruenbacher" <agruenba@redhat.com>,
"Matthew Wilcox" <willy@infradead.org>, "Jan Kara" <jack@suse.cz>,
"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>,
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"Nathan Chancellor" <nathan@kernel.org>,
"Nick Desaulniers" <ndesaulniers@google.com>,
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"Justin Stitt" <justinstitt@google.com>,
"Nilay Shroff" <nilay@linux.ibm.com>,
"Tao Cui" <cuitao@kylinos.cn>,
linux-block@vger.kernel.org, cgroups@vger.kernel.org,
linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org,
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Subject: Re: dm review needed, was: Re: [PATCH v3 2/3] blk-cgroup: store blkcg in bio instead of blkg
Date: Fri, 18 Sep 2026 11:31:23 +0200 [thread overview]
Message-ID: <20260918093123.GA13158@lst.de> (raw)
In-Reply-To: <daf4ba77-4c25-4993-900d-ee1fe713d9b6@fygo.io>
On Fri, Sep 18, 2026 at 05:19:53PM +0800, yu kuai wrote:
> So I think we don't need to restore the reference, BTW, there is another approach to
> avoid such problem in blk-throttle I don't take for now:
>
> For bio entering blk-throttle, we can clear the new flag and blkg reference directly
> after the bio is throttled and before this bio is issuing to disk, because bio will
> not enter blk-throttle in the completion path. And since blk-throttle is the only rq_qos
> policy that can be enabled for bio-based disk, then dm_bio_record() will never see a
> bio with the new flag set.
That sounds much better, thanks!
next prev parent reply other threads:[~2026-09-18 9:31 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-18 4:17 [PATCH v3 0/3] blk-cgroup: store blkcg in bio before blkcg_mutex conversion Yu Kuai
2026-09-18 4:17 ` [PATCH v3 1/3] blk-cgroup: use a request_queue rhashtable for blkg lookup Yu Kuai
2026-09-18 4:17 ` [PATCH v3 2/3] blk-cgroup: store blkcg in bio instead of blkg Yu Kuai
2026-09-18 7:16 ` dm review needed, was: " Christoph Hellwig
2026-09-18 9:19 ` yu kuai
2026-09-18 9:31 ` Christoph Hellwig [this message]
2026-09-18 4:17 ` [PATCH v3 3/3] blk-cgroup: move async bio punt state to blkcg Yu Kuai
2026-09-18 5:52 ` Nilay Shroff
2026-09-18 7:17 ` Christoph Hellwig
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