cvs commit: src/sys/sparc64/sparc64 tick.c

[Thomas Moestl]

tmm         2003/05/29 10:49:21 PDT

  FreeBSD src repository

  Modified files:
    sys/sparc64/sparc64  tick.c 
  Log:
  Completely disable interrupts (not just raise %pil) when calculating the
  value to be written into tick_compare in tick_hardclock(). While
  we were taking care that the value to be written was at least TICK_GRACE
  ticks in the future, a vector interrupt could happen between calculating
  the value and writing it. If it took longer than TICK_GRACE to complete
  (which is doubtful for a single device-triggered vector interrupt, but
  quite likely for some IPIs), the value written would be in the past
  and tick interrupts (which drive hardclock and statclock) would stop
  until %tick wraps around, which takes a long time.
  Also, increase TICK_GRACE from 1000 to 10000 for good measure.
  
  Reported by:    kris
  Reviewed by:    jake
  Approved by:    re (scottl)
  
  Revision  Changes    Path
  1.13      +5 -4      src/sys/sparc64/sparc64/tick.c