svn commit: r316842 - stable/11/sys/kern
Andriy Gapon
avg at FreeBSD.org
Fri Apr 14 14:45:41 UTC 2017
Author: avg
Date: Fri Apr 14 14:45:39 2017
New Revision: 316842
URL: https://svnweb.freebsd.org/changeset/base/316842
Log:
MFC r315960: dtrace sched:::preempt should fire only when there is preemption
Modified:
stable/11/sys/kern/kern_synch.c
Directory Properties:
stable/11/ (props changed)
Modified: stable/11/sys/kern/kern_synch.c
==============================================================================
--- stable/11/sys/kern/kern_synch.c Fri Apr 14 14:44:06 2017 (r316841)
+++ stable/11/sys/kern/kern_synch.c Fri Apr 14 14:45:39 2017 (r316842)
@@ -430,7 +430,11 @@ mi_switch(int flags, struct thread *newt
PCPU_SET(switchticks, ticks);
CTR4(KTR_PROC, "mi_switch: old thread %ld (td_sched %p, pid %ld, %s)",
td->td_tid, td_get_sched(td), td->td_proc->p_pid, td->td_name);
- SDT_PROBE0(sched, , , preempt);
+#ifdef KDTRACE_HOOKS
+ if ((flags & SW_PREEMPT) != 0 || ((flags & SW_INVOL) != 0 &&
+ (flags & SW_TYPE_MASK) == SWT_NEEDRESCHED))
+ SDT_PROBE0(sched, , , preempt);
+#endif
sched_switch(td, newtd, flags);
CTR4(KTR_PROC, "mi_switch: new thread %ld (td_sched %p, pid %ld, %s)",
td->td_tid, td_get_sched(td), td->td_proc->p_pid, td->td_name);
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