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

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Message-Id: <F7FF3405-74FF-40C3-8C0E-12108170CEF0@linaro.org>
Date:   Mon, 14 Jan 2019 10:09:57 +0100
From:   Paolo Valente <paolo.valente@...aro.org>
To:     Jens Axboe <axboe@...nel.dk>
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



> 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?

Thanks,
Paolo

> 
> -- 
> Jens Axboe