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epoch(9): restore thread priority on exit if it was changed by a waiter

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Reported by:	markj
Approved by:	sbruno
This commit is contained in:
Matt Macy 2018-05-17 19:08:28 +00:00
parent 93b1fe0ed1
commit 766d225326
1 changed files with 6 additions and 0 deletions
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6
sys/kern/subr_epoch.c
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@ -290,6 +290,7 @@ epoch_enter_internal(epoch_t epoch, struct thread *td)
INIT_CHECK(epoch);
critical_enter();
td->td_pre_epoch_prio = td->td_priority;
eps = epoch->e_pcpu[curcpu];
#ifdef INVARIANTS
MPASS(td->td_epochnest < UCHAR_MAX - 2);
@ -326,6 +327,11 @@ epoch_exit_internal(epoch_t epoch, struct thread *td)
TAILQ_REMOVE(&eps->eps_record.er_tdlist, td, td_epochq);
eps->eps_record.er_gen++;
sched_unpin();
if (__predict_false(td->td_pre_epoch_prio != td->td_priority)) {
thread_lock(td);
sched_prio(td, td->td_pre_epoch_prio);
thread_unlock(td);
}
critical_exit();
}