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
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svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=315960
@ -430,7 +430,11 @@ mi_switch(int flags, struct thread *newtd)
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PCPU_SET(switchticks, ticks);
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CTR4(KTR_PROC, "mi_switch: old thread %ld (td_sched %p, pid %ld, %s)",
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td->td_tid, td_get_sched(td), td->td_proc->p_pid, td->td_name);
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SDT_PROBE0(sched, , , preempt);
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#ifdef KDTRACE_HOOKS
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if ((flags & SW_PREEMPT) != 0 || ((flags & SW_INVOL) != 0 &&
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(flags & SW_TYPE_MASK) == SWT_NEEDRESCHED))
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SDT_PROBE0(sched, , , preempt);
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#endif
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sched_switch(td, newtd, flags);
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CTR4(KTR_PROC, "mi_switch: new thread %ld (td_sched %p, pid %ld, %s)",
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td->td_tid, td_get_sched(td), td->td_proc->p_pid, td->td_name);
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