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Date:      Sat, 23 Aug 2014 17:31:56 +0000 (UTC)
From:      Alexander Motin <mav@FreeBSD.org>
To:        src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org
Subject:   svn commit: r270423 - head/sys/kern
Message-ID:  <201408231731.s7NHVuoX042435@svn.freebsd.org>
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Author: mav
Date: Sat Aug 23 17:31:56 2014
New Revision: 270423
URL: http://svnweb.freebsd.org/changeset/base/270423

Log:
  Restore pre-r239157 handling of sched_yield(), when thread time slice was
  aborted, allowing other threads to run.  Without this change thread is just
  rescheduled again, that was illustrated by provided test tool.
  
  PR:		192926
  Submitted by:	eric@vangyzen.net
  MFC after:	2 weeks

Modified:
  head/sys/kern/sched_4bsd.c
  head/sys/kern/sched_ule.c

Modified: head/sys/kern/sched_4bsd.c
==============================================================================
--- head/sys/kern/sched_4bsd.c	Sat Aug 23 17:19:21 2014	(r270422)
+++ head/sys/kern/sched_4bsd.c	Sat Aug 23 17:31:56 2014	(r270423)
@@ -982,7 +982,8 @@ sched_switch(struct thread *td, struct t
 		sched_load_rem();
 
 	td->td_lastcpu = td->td_oncpu;
-	preempted = !(td->td_flags & TDF_SLICEEND);
+	preempted = !((td->td_flags & TDF_SLICEEND) ||
+	    (flags & SWT_RELINQUISH));
 	td->td_flags &= ~(TDF_NEEDRESCHED | TDF_SLICEEND);
 	td->td_owepreempt = 0;
 	td->td_oncpu = NOCPU;

Modified: head/sys/kern/sched_ule.c
==============================================================================
--- head/sys/kern/sched_ule.c	Sat Aug 23 17:19:21 2014	(r270422)
+++ head/sys/kern/sched_ule.c	Sat Aug 23 17:31:56 2014	(r270423)
@@ -1857,7 +1857,8 @@ sched_switch(struct thread *td, struct t
 	ts->ts_rltick = ticks;
 	td->td_lastcpu = td->td_oncpu;
 	td->td_oncpu = NOCPU;
-	preempted = !(td->td_flags & TDF_SLICEEND);
+	preempted = !((td->td_flags & TDF_SLICEEND) ||
+	    (flags & SWT_RELINQUISH));
 	td->td_flags &= ~(TDF_NEEDRESCHED | TDF_SLICEEND);
 	td->td_owepreempt = 0;
 	if (!TD_IS_IDLETHREAD(td))

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