linux-kernel - Re: [PATCH BUGFIX 0/2] bfq: fix unbalanced decrements causing loss of throughput

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Message-ID: <cfe7c5d1-040a-33a7-bb63-ac591c6eec14@kernel.dk>
Date:   Mon, 14 Jan 2019 06:26:09 -0700
From:   Jens Axboe <axboe@...nel.dk>
To:     Paolo Valente <paolo.valente@...aro.org>
Cc:     linux-block <linux-block@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Mark Brown <broonie@...nel.org>, bfq-iosched@...glegroups.com,
        oleksandr@...alenko.name, federico@...ler.it
Subject: Re: [PATCH BUGFIX 0/2] bfq: fix unbalanced decrements causing loss of
 throughput

On 1/14/19 2:09 AM, Paolo Valente wrote:
> 
> 
>> Il giorno 7 dic 2018, alle ore 15:40, Jens Axboe <axboe@...nel.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@...nel.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