linux-kernel - Re: [PATCH v3 for-5.18/block] block: don't merge across cgroup boundaries if blkcg is enabled

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Message-Id: <164730690621.219116.11184082869298025827.b4-ty@kernel.dk>
Date:   Mon, 14 Mar 2022 19:15:06 -0600
From:   Jens Axboe <axboe@...nel.dk>
To:     Tejun Heo <tj@...nel.org>
Cc:     Josef Bacik <josef@...icpanda.com>, linux-kernel@...r.kernel.org,
        linux-block@...r.kernel.org, kernel-team@...com
Subject: Re: [PATCH v3 for-5.18/block] block: don't merge across cgroup boundaries if blkcg is enabled

On Mon, 14 Mar 2022 14:30:11 -1000, Tejun Heo wrote:
> blk-iocost and iolatency are cgroup aware rq-qos policies but they didn't
> disable merges across different cgroups. This obviously can lead to
> accounting and control errors but more importantly to priority inversions -
> e.g. an IO which belongs to a higher priority cgroup or IO class may end up
> getting throttled incorrectly because it gets merged to an IO issued from a
> low priority cgroup.
> 
> [...]

Applied, thanks!

[1/1] block: don't merge across cgroup boundaries if blkcg is enabled
      commit: 6b2b04590b51aa4cf395fcd185ce439cab5961dc

Best regards,
-- 
Jens Axboe