From: Tejun Heo <tj@kernel.org>
To: Christoph Hellwig <hch@lst.de>
Cc: Jens Axboe <axboe@kernel.dk>, Josef Bacik <josef@toxicpanda.com>,
linux-block@vger.kernel.org, cgroups@vger.kernel.org,
Andreas Herrmann <aherrmann@suse.de>
Subject: Re: [PATCH 05/15] blk-cgroup: store a gendisk to throttle in struct task_struct
Date: Fri, 27 Jan 2023 13:40:00 -1000 [thread overview]
Message-ID: <Y9Rg0GuNAmJPlDri@slm.duckdns.org> (raw)
In-Reply-To: <20230124065716.152286-6-hch@lst.de>
On Tue, Jan 24, 2023 at 07:57:05AM +0100, Christoph Hellwig wrote:
> void blkcg_maybe_throttle_current(void)
> {
> - struct request_queue *q = current->throttle_queue;
> + struct gendisk *disk = current->throttle_disk;
> struct blkcg *blkcg;
> struct blkcg_gq *blkg;
> bool use_memdelay = current->use_memdelay;
>
> - if (!q)
> + if (!disk)
> return;
>
> - current->throttle_queue = NULL;
> + current->throttle_disk = NULL;
> current->use_memdelay = false;
>
> + if (test_bit(GD_DEAD, &disk->state))
> + goto out_put_disk;
...
> @@ -1835,18 +1839,15 @@ void blkcg_maybe_throttle_current(void)
> */
> void blkcg_schedule_throttle(struct gendisk *disk, bool use_memdelay)
> {
> - struct request_queue *q = disk->queue;
> -
> if (unlikely(current->flags & PF_KTHREAD))
> return;
>
> - if (current->throttle_queue != q) {
> - if (!blk_get_queue(q))
> - return;
> + if (current->throttle_disk != disk) {
> + get_device(disk_to_dev(disk));
So, we're shifting the dead test from schedule to the actual throttle path,
which makes sense but I think this should at least be mentioned in the
description if not put in its own patch.
Thanks.
--
tejun
next prev parent reply other threads:[~2023-01-27 23:40 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-01-24 6:57 switch blk-cgroup to work on gendisk v2 Christoph Hellwig
2023-01-24 6:57 ` [PATCH 01/15] blk-cgroup: don't defer blkg_free to a workqueue Christoph Hellwig
2023-01-27 22:33 ` Tejun Heo
2023-01-28 15:12 ` Ming Lei
2023-01-30 18:01 ` Tejun Heo
2023-01-29 6:09 ` Yu Kuai
2023-01-24 6:57 ` [PATCH 02/15] block: don't call blk_throtl_stat_add for non-READ/WRITE commands Christoph Hellwig
2023-01-24 6:57 ` [PATCH 03/15] blk-cgroup: delay blk-cgroup initialization until add_disk Christoph Hellwig
2023-01-27 22:59 ` Tejun Heo
2023-01-24 6:57 ` [PATCH 04/15] blk-cgroup: pin the gendisk in struct blkcg_gq Christoph Hellwig
2023-01-27 23:15 ` Tejun Heo
2023-01-24 6:57 ` [PATCH 05/15] blk-cgroup: store a gendisk to throttle in struct task_struct Christoph Hellwig
2023-01-27 23:40 ` Tejun Heo [this message]
2023-02-01 8:06 ` Christoph Hellwig
2023-02-02 17:57 ` Tejun Heo
2023-01-24 6:57 ` [PATCH 06/15] blk-wbt: pass a gendisk to wbt_{enable,disable}_default Christoph Hellwig
2023-01-24 6:57 ` [PATCH 07/15] blk-wbt: pass a gendisk to wbt_init Christoph Hellwig
2023-01-24 6:57 ` [PATCH 08/15] blk-wbt: open code wbt_queue_depth_changed in wbt_update_limits Christoph Hellwig
2023-01-27 23:56 ` Tejun Heo
2023-01-24 6:57 ` [PATCH 09/15] blk-rq-qos: make rq_qos_add and rq_qos_del more useful Christoph Hellwig
2023-01-28 0:01 ` Tejun Heo
2023-01-24 6:57 ` [PATCH 10/15] blk-rq-qos: constify rq_qos_ops Christoph Hellwig
2023-01-24 6:57 ` [PATCH 11/15] blk-rq-qos: store a gendisk instead of request_queue in struct rq_qos Christoph Hellwig
2023-01-24 6:57 ` [PATCH 12/15] blk-cgroup: pass a gendisk to blkcg_{de,}activate_policy Christoph Hellwig
2023-01-24 6:57 ` [PATCH 13/15] blk-cgroup: pass a gendisk to pd_alloc_fn Christoph Hellwig
2023-01-24 6:57 ` [PATCH 14/15] blk-cgroup: pass a gendisk to blkg_lookup Christoph Hellwig
2023-01-24 6:57 ` [PATCH 15/15] blk-cgroup: move the cgroup information to struct gendisk Christoph Hellwig
2023-01-28 0:13 ` Tejun Heo
-- strict thread matches above, loose matches on Subject: below --
2023-01-17 8:12 switch blk-cgroup to work on gendisk Christoph Hellwig
2023-01-17 8:12 ` [PATCH 05/15] blk-cgroup: store a gendisk to throttle in struct task_struct Christoph Hellwig
2023-01-20 9:00 ` Andreas Herrmann
2023-01-27 7:03 ` Hannes Reinecke
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