[PATCH v8 00/17] add performance tracing facility

Changes since v7:
[04]: Fixed -Wextra compiler warnings, thanks to Ramsay Jones.
[11]: Added #ifndef TRACE_CONTEXT, explained why __FILE__ ":"
      __FUNCTION__ doesn't work.
[17]: New Documentation/technical/api-trace.txt

Karsten Blees (17):
  trace: move trace declarations from cache.h to new trace.h
  trace: consistently name the format parameter
  trace: remove redundant printf format attribute
  trace: improve trace performance
  Documentation/git.txt: improve documentation of 'GIT_TRACE*' variables
  sha1_file: change GIT_TRACE_PACK_ACCESS logging to use trace API
  trace: add infrastructure to augment trace output with additional info
  trace: disable additional trace output for unit tests
  trace: add current timestamp to all trace output
  trace: move code around, in preparation to file:line output
  trace: add 'file:line' to all trace output
  trace: add high resolution timer function to debug performance issues
  trace: add trace_performance facility to debug performance issues
  git: add performance tracing for git's main() function to debug
    scripts
  wt-status: simplify performance measurement by using getnanotime()
  progress: simplify performance measurement by using getnanotime()
  api-trace.txt: add trace API documentation

 Documentation/git.txt                 |  59 ++++--
 Documentation/technical/api-trace.txt |  97 +++++++++
 Makefile                              |   7 +
 builtin/receive-pack.c                |   2 +-
 cache.h                               |  13 +-
 commit.h                              |   1 +
 config.mak.uname                      |   1 +
 git-compat-util.h                     |   4 +
 git.c                                 |   2 +
 pkt-line.c                            |   8 +-
 progress.c                            |  71 +++----
 sha1_file.c                           |  30 +--
 shallow.c                             |  10 +-
 t/test-lib.sh                         |   4 +
 trace.c                               | 369 ++++++++++++++++++++++++++++------
 trace.h                               | 113 +++++++++++
 wt-status.c                           |  14 +-
 17 files changed, 629 insertions(+), 176 deletions(-)
 create mode 100644 Documentation/technical/api-trace.txt
 create mode 100644 trace.h