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Date: Mon, 13 Nov 2017 07:57:45 -0800 From: Tejun Heo <tj@...nel.org> To: Shaohua Li <shli@...nel.org> Cc: axboe@...nel.dk, linux-kernel@...r.kernel.org, kernel-team@...com, lizefan@...wei.com, hannes@...xchg.org, cgroups@...r.kernel.org, guro@...com Subject: Re: [PATCH 7/7] blk-throtl: don't throttle the same IO multiple times Hello, On Mon, Nov 13, 2017 at 03:13:48AM -0800, Tejun Heo wrote: > You're right. If we wanna take this approach, we need to keep the > throttled flag while cloning. The clearing part is still correct tho. > Without that, I get 1/4 bw limit enforced. Hmm... I'm not quite sure > where that 1/4 is coming from tho. Will investigate more. Okay, this is because when we spiit, the split bio is the first part which gets issued and then the orignal bio is wound forward and requeued. So, for the splits, the original bio is the one which gets trimmed in the front and requeued, so not clearing BIO_THROTTLED is enough. I think we should still copy BIO_THROTTLED on clones so that we don't get suprises w/ other bio drivers. Thanks. -- tejun
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