From: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
To: Jens Axboe <axboe@kernel.dk>,
linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
Cc: Liu Bo <bo.liu@linux.alibaba.com>, stable@vger.kernel.org
Subject: Re: [PATCH] blk-throttle: fix zero wait time for iops throttled group
Date: Wed, 10 Jul 2019 17:24:16 +0300 [thread overview]
Message-ID: <f4be51ff-e426-cc44-db94-3c26e2cfbca9@yandex-team.ru> (raw)
In-Reply-To: <30caacb5-4d45-016b-a97d-db8b37010218@kernel.dk>
On 10.07.2019 17:00, Jens Axboe wrote:
> On 7/8/19 9:29 AM, Konstantin Khlebnikov wrote:
>> After commit 991f61fe7e1d ("Blk-throttle: reduce tail io latency when iops
>> limit is enforced") wait time could be zero even if group is throttled and
>> cannot issue requests right now. As a result throtl_select_dispatch() turns
>> into busy-loop under irq-safe queue spinlock.
>>
>> Fix is simple: always round up target time to the next throttle slice.
>
> Applied, thanks. In the future, please break lines at 72 chars in
> commit messages, I fixed it up.
>
Ok, but Documentation/process/submitting-patches.rst and
scripts/checkpatch.pl recommends 75 chars per line.
next prev parent reply other threads:[~2019-07-10 14:24 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-08 15:29 Konstantin Khlebnikov
2019-07-08 19:08 ` Liu Bo
2019-07-09 7:18 ` Konstantin Khlebnikov
2019-07-10 10:42 ` Konstantin Khlebnikov
2019-07-10 14:00 ` Jens Axboe
2019-07-10 14:24 ` Konstantin Khlebnikov [this message]
2019-07-10 14:25 ` Jens Axboe
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