Author: mmacy
Date: Thu May 17 19:08:28 2018
New Revision: 333755
URL: https://svnweb.freebsd.org/changeset/base/333755
Log:
epoch(9): restore thread priority on exit if it was changed by a waiter
Reported by: markj
Approved by: sbruno
Modified:
head/sys/kern/subr_epoch.c
Modified: head/sys/kern/subr_epoch.c
==============================================================================
--- head/sys/kern/subr_epoch.c Thu May 17 19:06:44 2018 (r333754)
+++ head/sys/kern/subr_epoch.c Thu May 17 19:08:28 2018 (r333755)
@@ -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();
}
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