Descriptionruntime: prevent sysmon from polling network excessivly
If the network is not polled for 10ms, sysmon starts polling network
on every iteration (every 20us) until another thread blocks in netpoll.
Fixes issue 5922.
Patch Set 1 #Patch Set 2 : diff -r 353ca41927f1 https://dvyukov%40google.com@code.google.com/p/go/ #Patch Set 3 : diff -r 353ca41927f1 https://dvyukov%40google.com@code.google.com/p/go/ #Patch Set 4 : diff -r c2eb7db7c980 https://dvyukov%40google.com@code.google.com/p/go/ #MessagesTotal messages: 4
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