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From: Poul-Henning Kamp <phk@FreeBSD.org>
Date: Mon, 15 Apr 2002 05:23:12 -0700 (PDT)
To: cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org
Subject: cvs commit: src/sys/sys kernel.h src/sys/kern kern_ntptime.c
         kern_tc.c kern_time.c subr_param.c
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phk         2002/04/15 05:23:12 PDT

  Modified files:
    sys/sys              kernel.h 
    sys/kern             kern_ntptime.c kern_tc.c kern_time.c 
                         subr_param.c 
  Log:
  Improve the implementation of adjtime(2).
  
  Apply the change as a continuous slew rather than as a series of
  discrete steps and make it possible to adjust arbitraryly huge
  amounts of time in either direction.
  
  In practice this is done by hooking into the same once-per-second
  loop as the NTP PLL and setting a suitable frequency offset deducting
  the amount slewed from the remainder.  If the remaining delta is
  larger than 1 second we slew at 5000PPM (5msec/sec), for a delta
  less than a second we slew at 500PPM (500usec/sec) and for the last
  one second period we will slew at whatever rate (less than 500PPM)
  it takes to eliminate the delta entirely.
  
  The old implementation stepped the clock a number of microseconds
  every HZ to acheive the same effect, using the same rates of change.
  
  Eliminate the global variables tickadj, tickdelta and timedelta and
  their various use and initializations.
  
  This removes the most significant obstacle to running timecounter and
  NTP housekeeping from a timeout rather than hardclock.
  
  Revision  Changes    Path
  1.44      +74 -0     src/sys/kern/kern_ntptime.c
  1.119     +4 -19     src/sys/kern/kern_tc.c
  1.81      +0 -72     src/sys/kern/kern_time.c
  1.54      +0 -2      src/sys/kern/subr_param.c
  1.102     +0 -3      src/sys/sys/kernel.h

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