From: Tejun Heo <tj@kernel.org>
To: Josef Bacik <josef@toxicpanda.com>
Cc: axboe@kernel.dk, kernel-team@fb.com, linux-block@vger.kernel.org,
akpm@linux-foundation.org, linux-mm@kvack.org,
hannes@cmpxchg.org, linux-kernel@vger.kernel.org,
linux-fsdevel@vger.kernel.org, Josef Bacik <jbacik@fb.com>
Subject: Re: [PATCH 01/13] block: add bi_blkg to the bio for cgroups
Date: Wed, 30 May 2018 08:49:33 -0700 [thread overview]
Message-ID: <20180530154933.GI1351649@devbig577.frc2.facebook.com> (raw)
In-Reply-To: <20180529211724.4531-2-josef@toxicpanda.com>
On Tue, May 29, 2018 at 05:17:12PM -0400, Josef Bacik wrote:
> From: Josef Bacik <jbacik@fb.com>
>
> Currently io.low uses a bi_cg_private to stash its private data for the
> blkg, however other blkcg policies may want to use this as well. Since
> we can get the private data out of the blkg, move this to bi_blkg in the
> bio and make it generic, then we can use bio_associate_blkg() to attach
> the blkg to the bio.
>
> Theoretically we could simply replace the bi_css with this since we can
> get to all the same information from the blkg, however you have to
> lookup the blkg, so for example wbc_init_bio() would have to lookup and
> possibly allocate the blkg for the css it was trying to attach to the
> bio. This could be problematic and result in us either not attaching
> the css at all to the bio, or falling back to the root blkcg if we are
> unable to allocate the corresponding blkg.
>
> So for now do this, and in the future if possible we could just replace
> the bi_css with bi_blkg and update the helpers to do the correct
> translation.
>
> Signed-off-by: Josef Bacik <jbacik@fb.com>
Acked-by: Tejun Heo <tj@kernel.org>
Thanks.
--
tejun
next prev parent reply other threads:[~2018-05-30 15:49 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-05-29 21:17 [PATCH 00/13] Introdue io.latency io controller for cgroups Josef Bacik
2018-05-29 21:17 ` [PATCH 01/13] block: add bi_blkg to the bio " Josef Bacik
2018-05-30 15:49 ` Tejun Heo [this message]
2018-05-29 21:17 ` [PATCH 02/13] block: introduce bio_issue_as_root_blkg Josef Bacik
2018-05-30 15:53 ` Tejun Heo
2018-05-29 21:17 ` [PATCH 03/13] blk-cgroup: allow controllers to output their own stats Josef Bacik
2018-05-30 15:54 ` Tejun Heo
2018-05-29 21:17 ` [PATCH 04/13] blk: introduce REQ_SWAP Josef Bacik
2018-05-30 15:58 ` Tejun Heo
2018-05-29 21:17 ` [PATCH 05/13] swap,blkcg: issue swap io with the appropriate context Josef Bacik
2018-05-30 13:06 ` Johannes Weiner
2018-05-30 16:05 ` Tejun Heo
2018-05-29 21:17 ` [PATCH 06/13] blkcg: add generic throttling mechanism Josef Bacik
2018-05-30 13:11 ` Johannes Weiner
2018-05-30 16:26 ` Tejun Heo
2018-05-29 21:17 ` [PATCH 07/13] memcontrol: schedule throttling if we are congested Josef Bacik
2018-05-30 14:15 ` Johannes Weiner
2018-05-29 21:17 ` [PATCH 08/13] blk-stat: export helpers for modifying blk_rq_stat Josef Bacik
2018-05-30 16:31 ` Tejun Heo
2018-05-29 21:17 ` [PATCH 09/13] blk-rq-qos: refactor out common elements of blk-wbt Josef Bacik
2018-05-29 21:17 ` [PATCH 10/13] block: remove external dependency on wbt_flags Josef Bacik
2018-05-29 21:17 ` [PATCH 11/13] rq-qos: introduce dio_bio callback Josef Bacik
2018-05-29 21:17 ` [PATCH 12/13] block: introduce blk-iolatency io controller Josef Bacik
2018-05-29 22:07 ` Randy Dunlap
2018-05-30 16:40 ` Tejun Heo
2018-05-29 21:17 ` [PATCH 13/13] Documentation: add a doc for blk-iolatency Josef Bacik
2018-05-30 16:44 ` Tejun Heo
2018-05-30 18:32 ` Randy Dunlap
2018-06-05 13:29 [PATCH 00/13][V2] Introduce io.latency io controller for cgroups Josef Bacik
2018-06-05 13:29 ` [PATCH 01/13] block: add bi_blkg to the bio " Josef Bacik
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