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From: Paolo Valente <paolo.valente@linaro.org>
To: Tejun Heo <tj@kernel.org>
Cc: "Michal Koutný" <mkoutny@suse.com>,
	"Johannes Weiner" <hannes@cmpxchg.org>,
	clm@fb.com, dennisz@fb.com, newella@fb.com,
	"Li Zefan" <lizefan@huawei.com>, "Jens Axboe" <axboe@kernel.dk>,
	"Josef Bacik" <josef@toxicpanda.com>,
	"Josef Bacik" <jbacik@fb.com>,
	kernel-team@fb.com, "Rik van Riel" <riel@surriel.com>,
	cgroups@vger.kernel.org, linux-block@vger.kernel.org,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH 08/10] blkcg: implement blk-iocost
Date: Wed, 11 Sep 2019 18:44:31 +0200
Message-ID: <37CB2690-F1B9-4159-B6A9-77BDB0FF906D@linaro.org> (raw)
In-Reply-To: <20190911141630.GV2263813@devbig004.ftw2.facebook.com>



> Il giorno 11 set 2019, alle ore 16:16, Tejun Heo <tj@kernel.org> ha scritto:
> 
> Hello,
> 
> On Wed, Sep 11, 2019 at 10:18:53AM +0200, Paolo Valente wrote:
>>> The two being enabled at the same time doesn't make sense, so we can
>>> just switch over to bfq when bfq is selected as the iosched.  I asked
>>> what Paolo wanted to do in terms of interface a couple times now but
>>> didn't get an answer and he posted a patch which makes the two
>>> controllers conflict, so....  Paolo, so it looks like you want to
>>> rename all bfq files to drop the bfq prefix, right?
>> 
>> Yep, mainly because ... this is the solution you voted and you
>> yourself proposed [1] :)
>> 
>> [1] https://patchwork.kernel.org/patch/10988261/
> 
> So, that was then.  Since then the interface change has been published
> and userspace, at least some of them, already had to adjust.  Now, I
> don't have any opinion on the matter and flipping again will cause
> inconveniences to some subset of users.  It's your call.
> 

Ok, then let's go for removing bfq prefix, as expected, e.g., by
systemd community [1].  A few days ago I reposted a patch removing the
prefix from all involved parameters [2], it should make all legacy
software work again.

[1] https://github.com/systemd/systemd/issues/7057
[2] https://lkml.org/lkml/2019/9/9/47

>>> I can implement
>>> the switching if so.
>> 
>> That would be perfect.
> 
> Whichever way it gets decided, this is easy enough.  I'll prep a
> patch.
> 

Thank you for that too,
Paolo

> Thanks.
> 
> -- 
> tejun


  parent reply index

Thread overview: 30+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-28 22:05 [PATCHSET v3 block/for-linus] IO cost model based work-conserving porportional controller Tejun Heo
2019-08-28 22:05 ` [PATCH 01/10] blkcg: pass @q and @blkcg into blkcg_pol_alloc_pd_fn() Tejun Heo
2019-08-28 22:05 ` [PATCH 02/10] blkcg: make ->cpd_init_fn() optional Tejun Heo
2019-08-28 22:05 ` [PATCH 03/10] blkcg: separate blkcg_conf_get_disk() out of blkg_conf_prep() Tejun Heo
2019-08-28 22:05 ` [PATCH 04/10] block/rq_qos: add rq_qos_merge() Tejun Heo
2019-08-28 22:05 ` [PATCH 05/10] block/rq_qos: implement rq_qos_ops->queue_depth_changed() Tejun Heo
2019-08-28 22:05 ` [PATCH 06/10] blkcg: s/RQ_QOS_CGROUP/RQ_QOS_LATENCY/ Tejun Heo
2019-08-28 22:05 ` [PATCH 07/10] blk-mq: add optional request->alloc_time_ns Tejun Heo
2019-08-28 22:05 ` [PATCH 08/10] blkcg: implement blk-iocost Tejun Heo
2019-08-29 15:53   ` [PATCH] blkcg: fix missing free on error path of blk_iocost_init() Tejun Heo
2019-09-10 12:55   ` [PATCH 08/10] blkcg: implement blk-iocost Michal Koutný
2019-09-10 16:08     ` Tejun Heo
2019-09-11  8:18       ` Paolo Valente
2019-09-11 14:16         ` Tejun Heo
2019-09-11 15:54           ` Tejun Heo
2019-09-11 16:44           ` Paolo Valente [this message]
2019-10-03 14:51       ` Michal Koutný
2019-10-03 16:45         ` Tejun Heo
2019-10-09 15:36           ` Michal Koutný
2019-10-14 15:36             ` Tejun Heo
2019-11-01 16:15               ` Michal Koutný
2019-11-01 16:56                 ` Paolo Valente
2019-08-28 22:05 ` [PATCH 09/10] blkcg: add tools/cgroup/iocost_monitor.py Tejun Heo
2019-08-28 22:06 ` [PATCH 10/10] blkcg: add tools/cgroup/iocost_coef_gen.py Tejun Heo
2019-08-29  3:29 ` [PATCHSET v3 block/for-linus] IO cost model based work-conserving porportional controller Jens Axboe
     [not found] ` <20190829082248.6464-1-hdanton@sina.com>
2019-08-29 15:43   ` [PATCH 07/10] blk-mq: add optional request->alloc_time_ns Tejun Heo
     [not found] ` <20190829133928.16192-1-hdanton@sina.com>
2019-08-29 15:46   ` [PATCH 08/10] blkcg: implement blk-iocost Tejun Heo
2019-08-29 15:54 ` [PATCHSET v3 block/for-linus] IO cost model based work-conserving porportional controller Paolo Valente
2019-08-29 15:56   ` Tejun Heo
  -- strict thread matches above, loose matches on Subject: below --
2019-07-10 20:51 [PATCHSET v2 " Tejun Heo
2019-07-10 20:51 ` [PATCH 08/10] blkcg: implement blk-iocost Tejun Heo

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