cv: do a lockless check for no waiters in cv_signal and cv_broadcastpri
In case of some consumers like zfs there are no waiters vast majority of the time Reviewed by: jhb MFC after: 1 week
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svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=305482
@ -397,6 +397,8 @@ cv_signal(struct cv *cvp)
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{
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int wakeup_swapper;
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if (cvp->cv_waiters == 0)
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return;
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wakeup_swapper = 0;
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sleepq_lock(cvp);
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if (cvp->cv_waiters > 0) {
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@ -424,6 +426,8 @@ cv_broadcastpri(struct cv *cvp, int pri)
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{
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int wakeup_swapper;
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if (cvp->cv_waiters == 0)
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return;
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/*
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* XXX sleepq_broadcast pri argument changed from -1 meaning
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* no pri to 0 meaning no pri.
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