cvs commit: src/sys/kern subr_autoconf.c

[Robert Watson]

rwatson     2008-07-27 23:28:29 UTC

  FreeBSD src repository

  Modified files:        (Branch: RELENG_7)
    sys/kern             subr_autoconf.c 
  Log:
  SVN rev 180855 on 2008-07-27 23:28:29Z by rwatson
  
  Merge r180610, r180616, r180673 from head to stable/7:
  
    Add DDB "show conifhk" command, which lists hooks currently waiting
    for completion in run_interrupt_driven_config_hooks().  This is
    helpful when trying to figure out which device drivers have gone
    into la-la land during boot-time autoconfiguration.
  
    Rather than simply waiting silently and indefinitely for all
    interrupt-driven configuration handlers to complete, print out a
    diagnostic message every 60 second indicating which handlers are
    still running.  Do this at most 5 times per run so as to avoid
    scrolling out any useful information from the kernel message
    buffer.
  
    The interval of 60 seconds was selected based on a best guess as
    to the nature of "long enough" and may want to be tuned higher
    or lower depending on real-world tolerances.
  
    If run_interrupt_driven_config_hooks() waits 360 seconds and INVARIANTS
    is compiled into the kernel, then panic.
  
    Discussed with: scottl
  
  Revision  Changes    Path
  1.23.2.3  +66 -2     src/sys/kern/subr_autoconf.c