blk-mq will rerun queue via RESTART after one request is completed,
so not necessary to wait random time for requeuing, we should trust
blk-mq to do it.
More importantly, we need return BLK_STS_RESOURCE to blk-mq
so that dequeue from I/O scheduler can be stopped, then
I/O merge gets improved.
blk-mq will rerun queue via RESTART after one request is completed,
so not necessary to wait random time for requeuing, we should trust
blk-mq to do it.
More importantly, we need return BLK_STS_RESOURCE to blk-mq
so that dequeue from I/O scheduler can be stopped, then
I/O merge gets improved.
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