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| author | avg <avg@FreeBSD.org> | 2017-04-14 14:45:39 +0000 |
|---|---|---|
| committer | avg <avg@FreeBSD.org> | 2017-04-14 14:45:39 +0000 |
| commit | 9d1a30867b750d1c56228c6311c0f84f0d11555d (patch) | |
| tree | df986c62ae045bf2644af0b315fd6c698ab0a3ef /sys/kern | |
| parent | e445463286be26270b322e849720035b1bb635c8 (diff) | |
| download | FreeBSD-src-9d1a30867b750d1c56228c6311c0f84f0d11555d.zip FreeBSD-src-9d1a30867b750d1c56228c6311c0f84f0d11555d.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 f6130e6..e98cbd4 100644 --- a/sys/kern/kern_synch.c +++ b/sys/kern/kern_synch.c @@ -430,7 +430,11 @@ 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_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); |
