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From: Tejun Heo <tj@kernel.org>
To: Yu Kuai <yukuai1@huaweicloud.com>
Cc: mkoutny@suse.com, axboe@kernel.dk, ming.lei@redhat.com,
	cgroups@vger.kernel.org, linux-block@vger.kernel.org,
	linux-kernel@vger.kernel.org, yi.zhang@huawei.com,
	"yukuai (C)" <yukuai3@huawei.com>
Subject: Re: [PATCH v7 1/9] blk-throttle: fix that io throttle can only work for single bio
Date: Sun, 21 Aug 2022 21:25:52 -1000	[thread overview]
Message-ID: <YwMvgN0YxNvkC1gm@slm.duckdns.org> (raw)
In-Reply-To: <b1791e41-4945-a0d8-8067-3841ce10fddd@huaweicloud.com>

Hello,

On Mon, Aug 22, 2022 at 11:06:44AM +0800, Yu Kuai wrote:
> While implementing the new method, I found that there seems to be a
> misunderstanding here, the code seems to try to add flag to split bio
> so that it won't be throttled again for bps limit, however:
> 
> 1) for blk throttle, split bio is issued directly and will never be
> throttled again, while orignal bio will go through throttle path again.
> 2) if cloned bio is directed to a new disk, the flag is cleared anyway.

Doesn't that make the current code correct then? But you were seeing
incorrect behaviors, right?

Thanks.

-- 
tejun

WARNING: multiple messages have this Message-ID (diff)
From: Tejun Heo <tj-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
To: Yu Kuai <yukuai1-XF6JlduFytWkHkcT6e4Xnw@public.gmane.org>
Cc: mkoutny-IBi9RG/b67k@public.gmane.org,
	axboe-tSWWG44O7X1aa/9Udqfwiw@public.gmane.org,
	ming.lei-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org,
	cgroups-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	linux-block-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	yi.zhang-hv44wF8Li93QT0dZR+AlfA@public.gmane.org,
	"yukuai (C)" <yukuai3-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>
Subject: Re: [PATCH v7 1/9] blk-throttle: fix that io throttle can only work for single bio
Date: Sun, 21 Aug 2022 21:25:52 -1000	[thread overview]
Message-ID: <YwMvgN0YxNvkC1gm@slm.duckdns.org> (raw)
In-Reply-To: <b1791e41-4945-a0d8-8067-3841ce10fddd-XF6JlduFytWkHkcT6e4Xnw@public.gmane.org>

Hello,

On Mon, Aug 22, 2022 at 11:06:44AM +0800, Yu Kuai wrote:
> While implementing the new method, I found that there seems to be a
> misunderstanding here, the code seems to try to add flag to split bio
> so that it won't be throttled again for bps limit, however:
> 
> 1) for blk throttle, split bio is issued directly and will never be
> throttled again, while orignal bio will go through throttle path again.
> 2) if cloned bio is directed to a new disk, the flag is cleared anyway.

Doesn't that make the current code correct then? But you were seeing
incorrect behaviors, right?

Thanks.

-- 
tejun

  reply	other threads:[~2022-08-22  7:26 UTC|newest]

Thread overview: 62+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-08-02 14:04 [PATCH v7 0/9] bugfix and cleanup for blk-throttle Yu Kuai
2022-08-02 14:04 ` Yu Kuai
2022-08-02 14:04 ` [PATCH v7 1/9] blk-throttle: fix that io throttle can only work for single bio Yu Kuai
2022-08-16 19:37   ` Tejun Heo
2022-08-17  1:13     ` Yu Kuai
2022-08-17  1:13       ` Yu Kuai
2022-08-17 17:50       ` Tejun Heo
2022-08-18  1:23         ` Yu Kuai
2022-08-18  1:23           ` Yu Kuai
2022-08-22  3:06           ` Yu Kuai
2022-08-22  3:06             ` Yu Kuai
2022-08-22  7:25             ` Tejun Heo [this message]
2022-08-22  7:25               ` Tejun Heo
2022-08-22  7:44               ` Yu Kuai
2022-08-22  7:44                 ` Yu Kuai
2022-08-02 14:04 ` [PATCH v7 2/9] blk-throttle: prevent overflow while calculating wait time Yu Kuai
2022-08-02 14:04 ` [PATCH v7 3/9] blk-throttle: factor out code to calculate ios/bytes_allowed Yu Kuai
2022-08-02 14:04   ` Yu Kuai
2022-08-16 19:47   ` Tejun Heo
2022-08-17  1:32     ` Yu Kuai
2022-08-17  1:32       ` Yu Kuai
2022-08-02 14:04 ` [PATCH v7 4/9] blk-throttle: fix io hung due to configuration updates Yu Kuai
2022-08-02 14:04   ` Yu Kuai
2022-08-16 20:01   ` Tejun Heo
2022-08-16 20:01     ` Tejun Heo
2022-08-17  1:30     ` Yu Kuai
2022-08-17  1:30       ` Yu Kuai
2022-08-17 17:52       ` Tejun Heo
2022-08-17 17:52         ` Tejun Heo
2022-08-18  1:16         ` Yu Kuai
2022-08-18  1:16           ` Yu Kuai
2022-08-19 17:33           ` Tejun Heo
2022-08-19 17:33             ` Tejun Heo
2022-08-02 14:04 ` [PATCH v7 5/9] blk-throttle: improve handling of re-entered bio for bps limit Yu Kuai
2022-08-02 14:04   ` Yu Kuai
2022-08-16 20:02   ` Tejun Heo
2022-08-16 20:02     ` Tejun Heo
2022-08-02 14:04 ` [PATCH v7 6/9] blk-throttle: use 'READ/WRITE' instead of '0/1' Yu Kuai
2022-08-02 14:04   ` Yu Kuai
2022-08-16 20:03   ` Tejun Heo
2022-08-17  1:33     ` Yu Kuai
2022-08-17  1:33       ` Yu Kuai
2022-08-02 14:04 ` [PATCH v7 7/9] blk-throttle: calling throtl_dequeue/enqueue_tg in pairs Yu Kuai
2022-08-02 14:04   ` Yu Kuai
2022-08-02 14:04 ` [PATCH v7 8/9] blk-throttle: cleanup tg_update_disptime() Yu Kuai
2022-08-02 14:04   ` Yu Kuai
2022-08-16 20:09   ` Tejun Heo
2022-08-17  1:38     ` Yu Kuai
2022-08-17  1:38       ` Yu Kuai
2022-08-02 14:04 ` [PATCH v7 9/9] blk-throttle: clean up flag 'THROTL_TG_PENDING' Yu Kuai
2022-08-02 14:04   ` Yu Kuai
2022-08-16 20:14   ` Tejun Heo
2022-08-17  1:45     ` Yu Kuai
2022-08-17  1:45       ` Yu Kuai
2022-08-17 17:54       ` Tejun Heo
2022-08-17 17:54         ` Tejun Heo
2022-08-18  9:29         ` Yu Kuai
2022-08-18  9:29           ` Yu Kuai
2022-08-19 17:35           ` Tejun Heo
2022-08-19 17:35             ` Tejun Heo
2022-08-13  5:59 ` [PATCH v7 0/9] bugfix and cleanup for blk-throttle Yu Kuai
2022-08-13  5:59   ` Yu Kuai

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