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Re: [patch, v2] blk-mq: avoid excessive boot delays with large lun counts

From Jeff Moyer <jmoyer@redhat.com>
Newsgroups linux.kernel
Subject Re: [patch, v2] blk-mq: avoid excessive boot delays with large lun counts
Date 2015-11-03 14:30 +0100
Message-ID <qqJOX-3f4-19@gated-at.bofh.it> (permalink)
References <qplF1-bI-29@gated-at.bofh.it> <qpOQG-1jd-9@gated-at.bofh.it> <qqnY6-6hS-21@gated-at.bofh.it> <qqyqu-4js-11@gated-at.bofh.it>
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Ming Lei <tom.leiming@gmail.com> writes:

>>> The above should be 'else if', otherwise the current queue will be set
>>> twice.
>>
>> I moved the list add below this to avoid that very issue.  See:
>>
>>>> +               queue_set_hctx_shared(q, true);
>>>>         list_add_tail(&q->tag_set_list, &set->tag_list);
>>            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
>>
>> This seemed the cleanest way to structure the code to avoid the double
>> walking of the hctx list for the current q.
>
> OK, it is correct, then v1 is fine.
>
> Reviewed-by: Ming Lei <ming.lei@canonical.com>

Thanks, Ming.  Jens, I'll re-send with the list_is_singular change and
this one should be ready for merging.

Cheers,
Jeff
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Thread

Re: [patch, v2] blk-mq: avoid excessive boot delays with large lun counts Ming Lei <tom.leiming@gmail.com> - 2015-11-01 01:40 +0100
  Re: [patch, v2] blk-mq: avoid excessive boot delays with large lun counts Jeff Moyer <jmoyer@redhat.com> - 2015-11-02 15:10 +0100
    Re: [patch, v2] blk-mq: avoid excessive boot delays with large lun counts Ming Lei <tom.leiming@gmail.com> - 2015-11-03 02:20 +0100
      Re: [patch, v2] blk-mq: avoid excessive boot delays with large lun counts Jeff Moyer <jmoyer@redhat.com> - 2015-11-03 14:30 +0100
        Re: [patch, v2] blk-mq: avoid excessive boot delays with large lun  counts Jens Axboe <axboe@kernel.dk> - 2015-11-03 16:30 +0100

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