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Date: Sun, 27 Feb 2022 09:16:54 -0800 From: Christoph Hellwig <hch@...radead.org> To: Yu Kuai <yukuai3@...wei.com> Cc: ming.lei@...hat.com, tj@...nel.org, axboe@...nel.dk, cgroups@...r.kernel.org, linux-block@...r.kernel.org, linux-kernel@...r.kernel.org, yi.zhang@...wei.com Subject: Re: [PATCH v9] block: cancel all throttled bios in del_gendisk() On Thu, Feb 10, 2022 at 07:56:37PM +0800, Yu Kuai wrote: > Throttled bios can't be issued after del_gendisk() is done, thus > it's better to cancel them immediately rather than waiting for > throttle is done. > > For example, if user thread is throttled with low bps while it's > issuing large io, and the device is deleted. The user thread will > wait for a long time for io to return. FYI, this crashed left rigt and center when running xfstests with traces pointing to throtl_pending_timer_fn.
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