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| author | avg <avg@FreeBSD.org> | 2017-04-14 14:45:44 +0000 |
|---|---|---|
| committer | avg <avg@FreeBSD.org> | 2017-04-14 14:45:44 +0000 |
| commit | ccafd717bc7a913a2646a256716e296cc0225816 (patch) | |
| tree | 5fbd0712123459dffbb4c1454b78b79e51783630 /sys/kern | |
| parent | 46c16fab10beb56d41392051ebede7165b9c68a7 (diff) | |
| download | FreeBSD-src-ccafd717bc7a913a2646a256716e296cc0225816.zip FreeBSD-src-ccafd717bc7a913a2646a256716e296cc0225816.tar.gz | |
MFC r315960: dtrace sched:::preempt should fire only when there is preemption
Diffstat (limited to 'sys/kern')
| -rw-r--r-- | sys/kern/kern_synch.c | 6 |
1 files changed, 5 insertions, 1 deletions
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 |
