Date: Fri, 14 Apr 2017 14:45:40 +0000 (UTC) From: Andriy Gapon <avg@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-11@freebsd.org Subject: svn commit: r316842 - stable/11/sys/kern Message-ID: <201704141445.v3EEjeN4074857@repo.freebsd.org>
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Author: avg Date: Fri Apr 14 14:45:39 2017 New Revision: 316842 URL: https://svnweb.freebsd.org/changeset/base/316842 Log: MFC r315960: dtrace sched:::preempt should fire only when there is preemption Modified: stable/11/sys/kern/kern_synch.c Directory Properties: stable/11/ (props changed) Modified: stable/11/sys/kern/kern_synch.c ============================================================================== --- stable/11/sys/kern/kern_synch.c Fri Apr 14 14:44:06 2017 (r316841) +++ stable/11/sys/kern/kern_synch.c Fri Apr 14 14:45:39 2017 (r316842) @@ -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);
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