From ccafd717bc7a913a2646a256716e296cc0225816 Mon Sep 17 00:00:00 2001 From: avg Date: Fri, 14 Apr 2017 14:45:44 +0000 Subject: MFC r315960: dtrace sched:::preempt should fire only when there is preemption --- sys/kern/kern_synch.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) (limited to 'sys/kern') diff --git a/sys/kern/kern_synch.c b/sys/kern/kern_synch.c index e0b05d6..28632df 100644 --- a/sys/kern/kern_synch.c +++ b/sys/kern/kern_synch.c @@ -462,7 +462,11 @@ mi_switch(int flags, struct thread *newtd) PCPU_SET(switchticks, ticks); CTR4(KTR_PROC, "mi_switch: old thread %ld (td_sched %p, pid %ld, %s)", td->td_tid, td->td_sched, 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 #ifdef XEN PT_UPDATES_FLUSH(); #endif -- cgit v1.1