From: Dennis Zhou <dennisszhou@gmail.com>
To: Tejun Heo <tj@kernel.org>
Cc: Jens Axboe <axboe@kernel.dk>,
Johannes Weiner <hannes@cmpxchg.org>,
Josef Bacik <josef@toxicpanda.com>,
kernel-team@fb.com, linux-block@vger.kernel.org,
cgroups@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 06/15] blkcg: always associate a bio with a blkg
Date: Thu, 6 Sep 2018 16:41:54 -0400 [thread overview]
Message-ID: <20180906204153.GA26048@dennisz-mbp.dhcp.thefacebook.com> (raw)
In-Reply-To: <20180831231609.GD1488037@devbig004.ftw2.facebook.com>
On Fri, Aug 31, 2018 at 04:16:09PM -0700, Tejun Heo wrote:
> Hello,
>
> On Thu, Aug 30, 2018 at 09:53:47PM -0400, Dennis Zhou wrote:
> > From: "Dennis Zhou (Facebook)" <dennisszhou@gmail.com>
> >
> > Previously, blkg's were only assigned as needed by blk-iolatency and
> > blk-throttle. bio->css was also always being associated while blkg was
> > being looked up and then thrown away in blkcg_bio_issue_check.
> >
> > This patch beings the cleanup of bio->css and bio->bi_blkg by always
> ^
> begins
>
Thanks!
> > +int bio_associate_create_blkg(struct request_queue *q, struct bio *bio)
> > +{
> > + struct blkcg *blkcg;
> > + struct blkcg_gq *blkg;
> > + int ret = 0;
> > +
> > + /* someone has already associated this bio with a blkg */
> > + if (bio->bi_blkg)
> > + return ret;
> > +
> > + rcu_read_lock();
> > +
> > + bio_associate_blkcg(bio, NULL);
> > + blkcg = bio_blkcg(bio);
> > +
> > + if (!blkcg->css.parent) {
> > + ret = bio_associate_blkg(bio, q->root_blkg);
> > + goto assoc_out;
> > + }
> > +
> > + blkg = blkg_lookup_create(blkcg, q);
> > + if (IS_ERR(blkg))
> > + blkg = q->root_blkg;
> > +
> > + ret = bio_associate_blkg(bio, blkg);
> > +assoc_out:
>
> Maybe if/else instead of goto?
>
Yeah, no need for goto.
Thanks,
Dennis
next prev parent reply other threads:[~2018-09-06 20:42 UTC|newest]
Thread overview: 54+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-08-31 1:53 [PATCH 00/15] blkcg ref count refactor/cleanup + blkcg avg_lat Dennis Zhou
2018-08-31 1:53 ` [PATCH 01/15] Revert "blk-throttle: fix race between blkcg_bio_issue_check() and cgroup_rmdir()" Dennis Zhou
2018-08-31 1:53 ` [PATCH 02/15] blkcg: delay blkg destruction until after writeback has finished Dennis Zhou
2018-08-31 15:27 ` Josef Bacik
2018-08-31 20:19 ` Dennis Zhou
2018-08-31 1:53 ` [PATCH 03/15] blkcg: use tryget logic when associating a blkg with a bio Dennis Zhou
2018-08-31 15:30 ` Josef Bacik
2018-08-31 20:20 ` Dennis Zhou
2018-08-31 1:53 ` [PATCH 04/15] blkcg: fix ref count issue with bio_blkcg using task_css Dennis Zhou
2018-08-31 15:35 ` Josef Bacik
2018-08-31 23:04 ` Tejun Heo
2018-09-06 15:21 ` Dennis Zhou
2018-08-31 1:53 ` [PATCH 05/15] blkcg: update blkg_lookup_create to do locking Dennis Zhou
2018-08-31 15:37 ` Josef Bacik
2018-08-31 23:09 ` Tejun Heo
2018-08-31 1:53 ` [PATCH 06/15] blkcg: always associate a bio with a blkg Dennis Zhou
2018-08-31 9:01 ` kbuild test robot
2018-08-31 10:02 ` kbuild test robot
2018-08-31 23:16 ` Tejun Heo
2018-09-06 20:41 ` Dennis Zhou [this message]
2018-09-07 3:03 ` [LKP] [blkcg] c02c58dab2: WARNING:at_block/blk-throttle.c:#blk_throtl_bio kernel test robot
2018-08-31 1:53 ` [PATCH 07/15] blkcg: consolidate bio_issue_init and blkg association Dennis Zhou
2018-08-31 9:19 ` kbuild test robot
2018-08-31 11:11 ` kbuild test robot
2018-08-31 15:42 ` Josef Bacik
2018-09-06 20:43 ` Dennis Zhou
2018-08-31 23:45 ` Tejun Heo
2018-08-31 1:53 ` [PATCH 08/15] blkcg: associate a blkg for pages being evicted by swap Dennis Zhou
2018-08-31 15:44 ` Josef Bacik
2018-08-31 23:47 ` Tejun Heo
2018-08-31 1:53 ` [PATCH 09/15] blkcg: associate writeback bios with a blkg Dennis Zhou
2018-08-31 15:45 ` Josef Bacik
2018-08-31 23:53 ` Tejun Heo
2018-08-31 1:53 ` [PATCH 10/15] blkcg: remove bio->bi_css and instead use bio->bi_blkg Dennis Zhou
2018-08-31 15:46 ` Josef Bacik
2018-09-01 0:13 ` Tejun Heo
2018-08-31 1:53 ` [PATCH 11/15] blkcg: remove additional reference to the css Dennis Zhou
2018-09-01 0:26 ` Tejun Heo
2018-09-06 20:45 ` Dennis Zhou
2018-08-31 1:53 ` [PATCH 12/15] blkcg: cleanup and make blk_get_rl use blkg_lookup_create Dennis Zhou
2018-09-01 0:29 ` Tejun Heo
2018-09-11 2:37 ` [LKP] [blkcg] 22f657e287: general_protection_fault:#[##] kernel test robot
2018-08-31 1:53 ` [PATCH 13/15] blkcg: change blkg reference counting to use percpu_ref Dennis Zhou
2018-08-31 15:49 ` Josef Bacik
2018-09-01 0:31 ` Tejun Heo
2018-09-06 20:46 ` Dennis Zhou
2018-09-07 3:08 ` [LKP] [blkcg] 6ef69a3a0b: WARNING:suspicious_RCU_usage kernel test robot
2018-08-31 1:53 ` [PATCH 14/15] blkcg: rename blkg_try_get to blkg_tryget Dennis Zhou
2018-08-31 15:50 ` Josef Bacik
2018-09-01 0:32 ` Tejun Heo
2018-08-31 1:53 ` [PATCH 15/15] blkcg: add average latency tracking to blk-cgroup Dennis Zhou
2018-08-31 10:22 ` kbuild test robot
2018-08-31 11:38 ` kbuild test robot
2018-09-01 0:35 ` [PATCH 00/15] blkcg ref count refactor/cleanup + blkcg avg_lat Tejun Heo
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