Re: [RFC PATCH V2 09/13] block: use per-task poll context to implement bio based io poll

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To: Ming Lei <ming.lei@xxxxxxxxxx>
Subject: Re: [RFC PATCH V2 09/13] block: use per-task poll context to implement bio based io poll
From: Sagi Grimberg <sagi@xxxxxxxxxxx>
Date: Wed, 24 Mar 2021 08:43:19 -0700
Cc: Jens Axboe <axboe@xxxxxxxxx>, linux-block@xxxxxxxxxxxxxxx, Christoph Hellwig <hch@xxxxxx>, Jeffle Xu <jefflexu@xxxxxxxxxxxxxxxxx>, Mike Snitzer <snitzer@xxxxxxxxxx>, dm-devel@xxxxxxxxxx
In-reply-to: <YFqDXeEsDNBfoWqW@T590>
References: <20210318164827.1481133-1-ming.lei@redhat.com> <20210318164827.1481133-10-ming.lei@redhat.com> <522a2c87-e9f3-e62a-e09b-084821c698a0@grimberg.me> <YFnYhBIiFhiyX8Wb@T590> <713f2a27-4a2c-8723-3dfd-de6d68956eb2@grimberg.me> <YFqDXeEsDNBfoWqW@T590>
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.7.1

Well, when it will failover, it will probably be directed to the poll
queues. Maybe I'm missing something...


In this patchset, because it isn't submitted directly from FS, there
isn't one polling context associated with this bio, so its HIPRI flag
will be cleared, then fallback to irq mode.


I think that's fine for failover I/O...

References:
- [RFC PATCH V2 00/13] block: support bio based io polling
  - From: Ming Lei
- [RFC PATCH V2 09/13] block: use per-task poll context to implement bio based io poll
  - From: Ming Lei
- Re: [RFC PATCH V2 09/13] block: use per-task poll context to implement bio based io poll
  - From: Sagi Grimberg
- Re: [RFC PATCH V2 09/13] block: use per-task poll context to implement bio based io poll
  - From: Ming Lei
- Re: [RFC PATCH V2 09/13] block: use per-task poll context to implement bio based io poll
  - From: Sagi Grimberg
- Re: [RFC PATCH V2 09/13] block: use per-task poll context to implement bio based io poll
  - From: Ming Lei

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