linux-kernel - Re: [PATCHSET/RFC v2] Make legacy IO schedulers work with blk-mq

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Date:   Tue, 6 Dec 2016 08:29:53 -0700
From:   Jens Axboe <axboe@...com>
To:     Paolo Valente <paolo.valente@...aro.org>
CC:     Jens Axboe <axboe@...nel.dk>, <linux-block@...r.kernel.org>,
        Linux-Kernal <linux-kernel@...r.kernel.org>,
        Mark Brown <broonie@...nel.org>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Linus Walleij <linus.walleij@...aro.org>
Subject: Re: [PATCHSET/RFC v2] Make legacy IO schedulers work with blk-mq

On 12/06/2016 03:01 AM, Paolo Valente wrote:
> 
>> Il giorno 05 dic 2016, alle ore 19:26, Jens Axboe <axboe@...com> ha scritto:
>>
>> Version 2 of the hack/patchset, that enables blk-mq to use the legacy
>> IO schedulers with single queue devices. Original posting is here:
>>
>> https://marc.info/?l=linux-block&m=148073493203664&w=2
>>
>> You can also found this version in the following git branch:
>>
>> git://git.kernel.dk/linux-block blk-mq-legacy-sched.2
>>
>> and new developments/fixes will happen in the 'blk-mq-legacy-sched'
>> branch.
>>
> 
> Hi Jens,
> while running some tests, the system hung after a while.
> 
> If I'm not mistaken, the above branches contain a (modified) 4.9-rc1.
> Maybe instability follows from that?  I have tried a rebase, but
> resulting conflicts are non-trivial (for me) to solve.
> 
> Meanwhile, if you deem it useful, I can provide you with the oops
> message, as I catch it.

Please do. I run my testing with master pulled in, but I can rebase the
branch to include that.

> As a secondary issue, iostat always reports 0 MB/s for both reads and
> writes, while tps are non null.

Looks like only the inflight stuff worked, but the completion bytes. Let
me fix that up. Done.

OK, pull from:

git://git.kernel.dk/linux-block blk-mq-legacy-sched

and you'll get the latest and greatest, and merged to 4.9-rc8 as well.

-- 
Jens Axboe