From: Tejun Heo <tj@kernel.org>
To: Hillf Danton <hdanton@sina.com>
Cc: axboe@kernel.dk, newella@fb.com, clm@fb.com,
josef@toxicpanda.com, dennisz@fb.com, lizefan@huawei.com,
hannes@cmpxchg.org, linux-kernel@vger.kernel.org,
linux-block@vger.kernel.org, kernel-team@fb.com,
cgroups@vger.kernel.org, Josef Bacik <jbacik@fb.com>,
Rik van Riel <riel@surriel.com>
Subject: Re: [PATCH 08/10] blkcg: implement blk-iocost
Date: Thu, 29 Aug 2019 08:46:09 -0700 [thread overview]
Message-ID: <20190829154609.GU2263813@devbig004.ftw2.facebook.com> (raw)
In-Reply-To: <20190829133928.16192-1-hdanton@sina.com>
Hello,
On Thu, Aug 29, 2019 at 09:39:28PM +0800, Hillf Danton wrote:
> > + on_q_ns = ktime_get_ns() - rq->alloc_time_ns;
> > + rq_wait_ns = rq->start_time_ns - rq->alloc_time_ns;
> > +
> ehm... alloc_time makes no sense wrt start_time if this is their only
> use. What are you trying to measure with the two stamps if they are
> meaningfully apart?
Queue depth depletion.
> > + rq_qos_add(q, rqos);
> > + ret = blkcg_activate_policy(q, &blkcg_policy_iocost);
> > + if (ret) {
> > + rq_qos_del(q, rqos);
>
> free_percpu(ioc->pcpu_stat);
Good catch. Will send a follow up patch.
Thanks.
--
tejun
next prev parent reply other threads:[~2019-08-29 15:46 UTC|newest]
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
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 ` Tejun Heo [this message]
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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