linux-kernel - Re: [PATCH BUGFIX 1/1] block, bfq: add requeue-request hook

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Date:   Tue, 06 Feb 2018 09:47:33 +0100
From:   Mike Galbraith <efault@....de>
To:     Oleksandr Natalenko <oleksandr@...alenko.name>
Cc:     Paolo Valente <paolo.valente@...aro.org>,
        Jens Axboe <axboe@...nel.dk>, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org, ulf.hansson@...aro.org,
        broonie@...nel.org, linus.walleij@...aro.org,
        bfq-iosched@...glegroups.com, alban.browaeys@...il.com,
        ming.lei@...hat.com, ivan@...ios.org, 169364@...denti.unimore.it,
        Serena Ziviani <ziviani.serena@...il.com>
Subject: Re: [PATCH BUGFIX 1/1] block, bfq: add requeue-request hook

On Tue, 2018-02-06 at 09:37 +0100, Oleksandr Natalenko wrote:
> Hi.
> 
> 06.02.2018 08:56, Mike Galbraith wrote:
> > I was doing kbuilds, and it blew up on me twice.  Switching back to cfq
> > seemed to confirm it was indeed the patch causing trouble, but that's
> > by no means a certainty.
> 
> Just to note, I was using v4.15.1, not the latest git HEAD. Are you able 
> to reproduce it on the stable kernel?

I didn't even try to wedge it into 4.15.1, tested it as posted.

>  Also, assuming this issue might be 
> unrelated to the BFQ itself, did you manage to reproduce the trouble 
> with another blk-mq scheduler (not CFQ, but mq-deadline/Kyber)?

I can give another scheduler a go this afternoon.

	-Mike