Another thing to note from that trace is that many writes
went through the entire submit_bio/elv_next_request/bio_endio
cycle between the submission and completion of the read.
So there was:
submit_bio(the read)
elv_next_request(the read)
...
submit_bio(a write)
elv_next_request(that write)
bio_endio(that write)
...
bio_endio(the read)
For many writes. I'm fairly (but not 100%) sure that the same
behaviour was seen with four tags.
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