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block, bfq: make waker-queue detection more robust
In the presence of many parallel I/O flows, the detection of waker bfq_queues suffers from false positives. This commits addresses this issue by making the filtering of actual wakers more selective. In more detail, a candidate waker must be found to meet waker requirements three times before being promoted to actual waker. Tested-by: Jan Kara <[email protected]> Signed-off-by: Paolo Valente <[email protected]> Signed-off-by: Jens Axboe <[email protected]>
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