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runtime: prevent sysmon from polling network excessivly

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If the network is not polled for 10ms, sysmon starts polling network
on every iteration (every 20us) until another thread blocks in netpoll.
Fixes #5922.

R=golang-dev, iant
CC=golang-dev
https://golang.org/cl/11569043
This commit is contained in:
Dmitriy Vyukov 2013-07-19 17:45:34 +04:00
parent 9bfb69187f
commit 6857264457
1 changed files with 1 additions and 0 deletions
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1
src/pkg/runtime/proc.c
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@ -2098,6 +2098,7 @@ sysmon(void)
lastpoll = runtime·atomicload64(&runtime·sched.lastpoll); lastpoll = runtime·atomicload64(&runtime·sched.lastpoll);
now = runtime·nanotime(); now = runtime·nanotime();
if(lastpoll != 0 && lastpoll + 10*1000*1000 > now) { if(lastpoll != 0 && lastpoll + 10*1000*1000 > now) {
runtime·cas64(&runtime·sched.lastpoll, lastpoll, now);
gp = runtime·netpoll(false); // non-blocking gp = runtime·netpoll(false); // non-blocking
injectglist(gp); injectglist(gp);
} }