linux-kernel - Re: [PATCHSET for-5.10/block] iocost: improve debt forgiveness logic

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Message-ID: <a4baed8e-d3a5-3801-7f26-5c32f2931177@kernel.dk>
Date:   Fri, 25 Sep 2020 08:35:30 -0600
From:   Jens Axboe <axboe@...nel.dk>
To:     Tejun Heo <tj@...nel.org>
Cc:     linux-block@...r.kernel.org, cgroups@...r.kernel.org,
        kernel-team@...com, linux-kernel@...r.kernel.org
Subject: Re: [PATCHSET for-5.10/block] iocost: improve debt forgiveness logic

On 9/17/20 6:44 PM, Tejun Heo wrote:
> Hello,
> 
> Debt reduction logic was recently added by dda1315f1853 ("blk-iocost: halve
> debts if device stays idle"). While it was effective at avoiding
> pathological cases where some iocgs were kept delayed while the device was
> most idle, it wasn't very effective at addressing more complex conditions
> and could leave low priority cgroups unnecessarily harshly throttled under
> moderate load.

Applied, thanks.

-- 
Jens Axboe