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Merge branch 'dev_watchdog-less-intrusive'
Eric Dumazet says:
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net: make dev_watchdog() less intrusive
dev_watchdog() is used on many NIC to periodically monitor TX queues
to detect hangs.
Problem is : It stops all queues, then check them, then 'unfreeze' them.
Not only this stops feeding the NIC, it also migrates all qdiscs
to be serviced on the cpu calling netif_tx_unlock(), causing
a potential latency artifact.
With many TX queues, this is becoming more visible.
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Signed-off-by: David S. Miller <davem@davemloft.net>