Messages in this thread | | | Date | Tue, 11 Oct 2022 07:03:13 -1000 | From | Tejun Heo <> | Subject | Re: [PATCH -next 3/5] blk-iocost: prevent configuration update concurrent with io throttling |
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On Tue, Oct 11, 2022 at 04:35:45PM +0800, Yu Kuai wrote: > From: Yu Kuai <yukuai3@huawei.com> > > This won't cause any severe problem currently, however, this doesn't > seems appropriate: > > 1) 'ioc->params' is read from multiple places without holding > 'ioc->lock', unexpected value might be read if writing it concurrently. > > 2) If configuration is changed while io is throttling, the functionality > might be affected. For example, if module params is updated and cost > becomes smaller, waiting for timer that is caculated under old > configuration is not appropriate. > > Signed-off-by: Yu Kuai <yukuai3@huawei.com>
Acked-by: Tejun Heo <tj@kernel.org>
Thanks.
-- tejun
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