git: kernel - Allow kprintf() output targets to be managed as a debugging aid.

[Matthew Dillon]

commit 62b54f3115ebc391f294c9877630727c98c10b4a
Author: Matthew Dillon <dillon at apollo.backplane.com>
Date:   Wed Aug 5 21:34:39 2015 -0700

    kernel - Allow kprintf() output targets to be managed as a debugging aid.
    
    * Add kern.kprintf_logging which is a bitmask of kprintf() logging targets.
      This can be adjusted to reduce kprintf() overhead and serialization when
      using it to debug kernel issues.
    
    * The default value is 0x05 which outputs to the console and the
      dmesg buffer.  One can disable console logging and spin-lock
      serialization by setting this to 0x14, causing kprintf() to only
      log to the dmesg buffer.
    
      0x01	Output to console
      0x02	(unsafe for general kprintf operation, do not use)
      0x04	Output to dmesg buffer
      0x08	(do not use)
      0x10	Do not serialize the whole kprintf() with a spin-lock.

Summary of changes:
 sys/kern/subr_prf.c | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/62b54f3115ebc391f294c9877630727c98c10b4a


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