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From: Andriy Gapon <avg@FreeBSD.org>
Date: Fri, 14 Apr 2017 14:45:40 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
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Subject: svn commit: r316842 - stable/11/sys/kern
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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);