Author: kib
Date: Fri Jun 5 08:26:38 2015
New Revision: 284020
URL: https://svnweb.freebsd.org/changeset/base/284020
Log:
MFC r283745:
Do not raise priority of the idle thread on singal delivery.
Modified:
stable/10/sys/kern/kern_sig.c
Directory Properties:
stable/10/ (props changed)
Modified: stable/10/sys/kern/kern_sig.c
==============================================================================
--- stable/10/sys/kern/kern_sig.c Fri Jun 5 08:23:33 2015
(r284019)
+++ stable/10/sys/kern/kern_sig.c Fri Jun 5 08:26:38 2015
(r284020)
@@ -2371,9 +2371,12 @@ tdsigwakeup(struct thread *td, int sig,
thread_lock(td);
/*
* Bring the priority of a thread up if we want it to get
- * killed in this lifetime.
+ * killed in this lifetime. Be careful to avoid bumping the
+ * priority of the idle thread, since we still allow to signal
+ * kernel processes.
*/
- if (action == SIG_DFL && (prop & SA_KILL) && td->td_priority > PUSER)
+ if (action == SIG_DFL && (prop & SA_KILL) != 0 &&
+ td->td_priority > PUSER && !TD_IS_IDLETHREAD(td))
sched_prio(td, PUSER);
if (TD_ON_SLEEPQ(td)) {
/*
@@ -2411,7 +2414,7 @@ tdsigwakeup(struct thread *td, int sig,
/*
* Give low priority threads a better chance to run.
*/
- if (td->td_priority > PUSER)
+ if (td->td_priority > PUSER && !TD_IS_IDLETHREAD(td))
sched_prio(td, PUSER);
wakeup_swapper = sleepq_abort(td, intrval);
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