linux-kernel - Re: [PATCH BUGFIX] block, bfq: deschedule empty bfq

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Message-Id: <CC298DB4-3107-4E9A-AD11-47AA070D85EF@linaro.org>
Date:   Thu, 14 Nov 2019 10:22:01 +0100
From:   Paolo Valente <paolo.valente@...aro.org>
To:     Jens Axboe <axboe@...nel.dk>
Cc:     Oleksandr Natalenko <oleksandr@...alenko.name>,
        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>,
        bfq-iosched@...glegroups.com, Chris Evich <cevich@...hat.com>,
        Patrick Dung <patdung100@...il.com>,
        Thorsten Schubert <tschubert@...h.org>
Subject: Re: [PATCH BUGFIX] block, bfq: deschedule empty bfq_queues not
 referred by any process



> Il giorno 13 nov 2019, alle ore 23:46, Jens Axboe <axboe@...nel.dk> ha scritto:
> 
> On 11/13/19 10:42 AM, Paolo Valente wrote:
>> 
>> 
>>> Il giorno 13 nov 2019, alle ore 16:01, Oleksandr Natalenko <oleksandr@...alenko.name> ha scritto:
>>> 
>>> On 13.11.2019 15:25, Oleksandr Natalenko wrote:
>>>> I didn't try to switch schedulers, but what I see now is once the
>>>> system is able to boot with BFQ, the I/O can still hang on I/O burst
>>>> (which for me happens to happen during VM reboot).
>>>> This may also not hang forever, but just slow down considerably. I've
>>>> noticed this inside a KVM VM, not on a real HW.
>>> 
>>> Possible call traces:
>> 
>> Ok, you may have given me enough information, thank you very much.
>> 
>> Could you please apply the attached (compressed) patch on top of my
>> offending patch?  For review purposes, here is the simple change:
> 
> FWIW, I dropped the previous patch.
> 

Thanks. I'm sending a V2.

Thanks,
Paolo

> -- 
> Jens Axboe