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Date: Fri, 3 Mar 2023 09:04:55 +0800 From: Yu Kuai <yukuai1@...weicloud.com> To: Yu Kuai <yukuai1@...weicloud.com>, hch@....de, ming.lei@...hat.com, axboe@...nel.dk Cc: linux-block@...r.kernel.org, linux-kernel@...r.kernel.org, yi.zhang@...wei.com, yangerkun@...wei.com, "yukuai (C)" <yukuai3@...wei.com> Subject: Re: [PATCH] blk-mq: quiesce queue while reallocating hctxs Hi, friendly ping ... Thanks, Kuai 在 2023/02/21 17:24, Yu Kuai 写道: > From: Yu Kuai <yukuai3@...wei.com> > > commit 8237c01f1696 ("blk-mq: use quiesced elevator switch when > reinitializing queues") add quiesce queue while switching elevator, > however, if old elevator is none, queue is still not quiesced. Hence > reallocating hctxs can concurrent with run queue. Fix it by also > quiesce queue in the beginning of __blk_mq_update_nr_hw_queues(). > > Signed-off-by: Yu Kuai <yukuai3@...wei.com> > --- > block/blk-mq.c | 8 ++++++-- > 1 file changed, 6 insertions(+), 2 deletions(-) > > diff --git a/block/blk-mq.c b/block/blk-mq.c > index d3494a796ba8..fb44ef0dff8a 100644 > --- a/block/blk-mq.c > +++ b/block/blk-mq.c > @@ -4691,8 +4691,10 @@ static void __blk_mq_update_nr_hw_queues(struct blk_mq_tag_set *set, > if (set->nr_maps == 1 && nr_hw_queues == set->nr_hw_queues) > return; > > - list_for_each_entry(q, &set->tag_list, tag_set_list) > + list_for_each_entry(q, &set->tag_list, tag_set_list) { > blk_mq_freeze_queue(q); > + blk_mq_quiesce_queue(q); > + } > /* > * Switch IO scheduler to 'none', cleaning up the data associated > * with the previous scheduler. We will switch back once we are done > @@ -4741,8 +4743,10 @@ static void __blk_mq_update_nr_hw_queues(struct blk_mq_tag_set *set, > list_for_each_entry(q, &set->tag_list, tag_set_list) > blk_mq_elv_switch_back(&head, q); > > - list_for_each_entry(q, &set->tag_list, tag_set_list) > + list_for_each_entry(q, &set->tag_list, tag_set_list) { > + blk_mq_unquiesce_queue(q); > blk_mq_unfreeze_queue(q); > + } > } > > void blk_mq_update_nr_hw_queues(struct blk_mq_tag_set *set, int nr_hw_queues) >
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