Author: avg
Date: Sat Mar 25 19:08:51 2017
New Revision: 315960
URL: https://svnweb.freebsd.org/changeset/base/315960
Log:
dtrace sched:::preempt should fire only when there is preemption
The probe fire on any thread switch before.
Reviewed by: markj
MFC after: 1 week
Sponsored by: Panzura
Modified:
head/sys/kern/kern_synch.c
Modified: head/sys/kern/kern_synch.c
==============================================================================
--- head/sys/kern/kern_synch.c Sat Mar 25 18:45:09 2017 (r315959)
+++ head/sys/kern/kern_synch.c Sat Mar 25 19:08:51 2017 (r315960)
@@ -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);
_______________________________________________
svn-src-all@freebsd.org mailing list
https://lists.freebsd.org/mailman/listinfo/svn-src-all
To unsubscribe, send any mail to "svn-src-all-unsubscr...@freebsd.org"
