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From: Jake Burkholder <jake@FreeBSD.org>
Date: Sun, 31 Mar 2002 21:35:26 -0800 (PST)
To: cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org
Subject: cvs commit: src/sys/conf options src/sys/kern kern_ktr.c
         src/sys/sys ktr.h src/sys/sparc64/sparc64 genassym.c
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jake        2002/03/31 21:35:26 PST

  Modified files:
    sys/conf             options 
    sys/kern             kern_ktr.c 
    sys/sys              ktr.h 
    sys/sparc64/sparc64  genassym.c 
  Log:
  ktr changes to improve performance and make writing a userland utility to
  dump the trace buffer feasible.
  - Remove KTR_EXTEND.  This changes the format of the trace entries when
    activated, making writing a userland tool which is not tied to a specific
    kernel configuration difficult.
  - Use get_cyclecount() for timestamps.  nanotime() is much too heavy weight
    and requires recursion protection due to ktr traces occuring as a result
    of ktr traces.  KTR_VERBOSE may still require recursion protection, which
    is now conditional on it.
  - Allow KTR_CPU to be overridden by MD code.  This is so that it is possible
    to trace early in startup before pcpu and/or curthread are setup.
  - Add a version number for the ktr interface.  A userland tool can check this
    to detect mismatches.
  - Use an array for the parameters to make decoding in userland easier.
  - Add file and line recording to the non-extended traces now that the extended
    version is no more.
  
  These changes will break gdb macros to decode the extended version of the
  trace buffer which are floating around.  Users of these macros should either
  use the show ktr command in ddb, or use the userland utility which can be run
  on a core dump.
  
  Approved by:    jhb
  Tested on:      i386, sparc64
  
  Revision  Changes    Path
  1.307     +0 -1      src/sys/conf/options
  1.29      +47 -70    src/sys/kern/kern_ktr.c
  1.30      +7 -6      src/sys/sparc64/sparc64/genassym.c
  1.16      +16 -51    src/sys/sys/ktr.h

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