cvs commit: src/sys/amd64/amd64 prof_machdep.c src/sys/i386/isa prof_machdep.c

[Bruce Evans]

bde         2004/05/26 02:43:38 PDT

  FreeBSD src repository

  Modified files:
    sys/amd64/amd64      prof_machdep.c 
    sys/i386/isa         prof_machdep.c 
  Log:
  Quick fix for overflow when tsc_freq >= 2^31.  "int profrate" in struct
  gmon and struct gmonhdr was originally just to represent the kernel
  (profiling) clock frequency and it remains poorly suited to representing
  the frequencies of fast counters like the TSC.  It broke a year or two
  ago.  This quick fix keeps it working for another year or month or two
  until TSC frequencies can exceed 2^32, by dividing the frequency by 2.
  Dividing the frequency by 4 would work for a little longer but would
  lose a little too much precision.
  
  Revision  Changes    Path
  1.21      +10 -3     src/sys/amd64/amd64/prof_machdep.c
  1.20      +10 -3     src/sys/i386/isa/prof_machdep.c