I've just put up a phabricator review for a fix to ULE and 4BSD for a priority inversion problem. The issue is that after a running thread's priority is lowered (usually due to releasing a mutex and having a priority load revoked), the scheduler does not check whether the thread should now be preempted by a thread waiting in the runq. See this old ML post for a detailed description of one instance that I saw:
https://lists.freebsd.org/pipermail/freebsd-current/2013-January/039261.html The review can be found here: https://reviews.freebsd.org/D9518 _______________________________________________ freebsd-current@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-current To unsubscribe, send any mail to "freebsd-current-unsubscr...@freebsd.org"
