From: Jens Axboe <axboe@kernel.dk>
To: Paolo Valente <paolo.valente@linaro.org>
Cc: linux-block <linux-block@vger.kernel.org>,
linux-kernel <linux-kernel@vger.kernel.org>,
Ulf Hansson <ulf.hansson@linaro.org>,
Linus Walleij <linus.walleij@linaro.org>,
Mark Brown <broonie@kernel.org>,
bfq-iosched@googlegroups.com, oleksandr@natalenko.name,
federico@willer.it
Subject: Re: [PATCH BUGFIX 0/2] bfq: fix unbalanced decrements causing loss of throughput
Date: Mon, 14 Jan 2019 06:26:09 -0700 [thread overview]
Message-ID: <cfe7c5d1-040a-33a7-bb63-ac591c6eec14@kernel.dk> (raw)
In-Reply-To: <F7FF3405-74FF-40C3-8C0E-12108170CEF0@linaro.org>
On 1/14/19 2:09 AM, Paolo Valente wrote:
>
>
>> Il giorno 7 dic 2018, alle ore 15:40, Jens Axboe <axboe@kernel.dk> ha scritto:
>>
>> On 12/7/18 3:01 AM, Paolo Valente wrote:
>>>
>>>
>>>> Il giorno 7 dic 2018, alle ore 03:23, Jens Axboe <axboe@kernel.dk> ha scritto:
>>>>
>>>> On 12/6/18 11:18 AM, Paolo Valente wrote:
>>>>> Hi Jens,
>>>>> the first patch in this series fixes an error in the decrementing of
>>>>> the counter of the number of groups with pending I/O. This wrong
>>>>> decrement caused loss of throughput or, less likely, of control on
>>>>> I/O. The second patch is a fix of some wrong comments, which somehow
>>>>> contributed to making the above bug more difficult to find.
>>>>
>>>> Are you fine with this going into 4.21? I can't quite tell what your
>>>> intent is. The first patch has a Fixes for something
>>>
>>> yep, that fixes a serious error.
>>>
>>>> that went into
>>>> this series, but then patch 2 is a comment update that would not
>>>> normally be something to be applied at this stage.
>>>>
>>>
>>> and yes, only comments changed by the second one
>>>
>>> May it make sense to apply them in two steps, one in the 4.20 and the other one in the 4.21?
>>
>> I think so, I'll do that.
>
> Hi Jens,
> is the second patch still queued?
That got dropped for some reason, I've applied it now.
--
Jens Axboe
prev parent reply other threads:[~2019-01-14 13:26 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-12-06 18:18 Paolo Valente
2018-12-06 18:18 ` [PATCH BUGFIX 1/2] block, bfq: fix decrement of num_active_groups Paolo Valente
2018-12-06 18:18 ` [PATCH BUGFIX 2/2] block, bfq: fix comments on __bfq_deactivate_entity Paolo Valente
2018-12-07 2:23 ` [PATCH BUGFIX 0/2] bfq: fix unbalanced decrements causing loss of throughput Jens Axboe
2018-12-07 10:01 ` Paolo Valente
2018-12-07 14:40 ` Jens Axboe
2019-01-14 9:09 ` Paolo Valente
2019-01-14 13:26 ` Jens Axboe [this message]
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