Messages in this thread | | | Date | Tue, 31 Jul 2018 12:58:06 +0800 | From | Ming Lei <> | Subject | Re: [RFC] blk-mq: clean up the hctx restart |
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On Tue, Jul 31, 2018 at 12:02:15PM +0800, Jianchao Wang wrote: > Currently, we will always set SCHED_RESTART whenever there are > requests in hctx->dispatch, then when request is completed and > freed the hctx queues will be restarted to avoid IO hang. This > is unnecessary most of time. Especially when there are lots of > LUNs attached to one host, the RR restart loop could be very > expensive.
The big RR restart loop has been killed in the following commit:
commit 97889f9ac24f8d2fc8e703ea7f80c162bab10d4d Author: Ming Lei <ming.lei@redhat.com> Date: Mon Jun 25 19:31:48 2018 +0800
blk-mq: remove synchronize_rcu() from blk_mq_del_queue_tag_set()
Thanks, Ming
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