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From: Jeff Roberson <jeff@FreeBSD.org>
Date: Sat, 14 Jun 2003 19:18:29 -0700 (PDT)
To: src-committers@FreeBSD.org, cvs-src@FreeBSD.org,
	cvs-all@FreeBSD.org
X-FreeBSD-CVS-Branch: HEAD
Subject: cvs commit: src/sys/kern sched_ule.c
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jeff        2003/06/14 19:18:29 PDT

  FreeBSD src repository

  Modified files:
    sys/kern             sched_ule.c 
  Log:
   - Fix the maximum slice value.  I accidentally checked in a value of '2'
     which meant no process would run for longer than 20ms.
   - Slightly redo the interactivity scorer.  It follows the same algorithm but
     in a slightly more correct way.  Previously values above half were
     incorrect.
   - Lower the interactivity threshold to 20.  It seems that in testing non-
     interactive tasks are hardly ever near there and expensive interactive
     tasks can sometimes surpass it.  This area needs more testing.
   - Remove an unnecessary KTR.
   - Fix a case where an idle thread that had an elevated priority due to
     priority prop. would be placed back on the idle queue.
   - Delay setting NEEDRESCHED until userret() for threads that haad their
     priority elevated while in kernel.  This gives us the same context switch
     optimization as SCHED_4BSD.
   - Limit the child's slice to 1 in sched_fork_kse() so we detect its behavior
     more quickly.
   - Inhert some of the run/slp time from the child in sched_exit_ksegrp().
   - Redo some of the priority comparisons so they are more clear.
   - Throttle the frequency of sched_pctcpu_update() so that rounding errors
     do not make it invalid.
  
  Revision  Changes    Path
  1.39      +54 -38    src/sys/kern/sched_ule.c