So surely the next step to take with this is to break run_task_queue(&tq_disk)
apart. There are really two uses for this call at the moment -
1. There is a shortage of request queue entries or memory
2. A specific page or buffer head is needed, push the task queue to
ensure the I/O gets done.
Once a system has multiple devices the second use is really a sledge-hammer,
all plugged request queues get unplugged and fire at once. Just prodding
the specific device into life would be much more preferable.
Steve Lord
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