[PATCH v6 00/11] add performance tracing facility

Changes since v5:
[05/11]: GIT_TRACE_BARE=1 disables 'timestamp file:line' output for
         unit tests that rely on trace output (t1510 and t5503)
[08/11]: Align original trace output at col 40
[09/11]: Dropped '(div 10e9)' from the commit message.
[10/11]: Dropped trace_performance[_since]() return value and the
         respective usage example. Renamed trace_performance_vfl to
         trace_performance_vprintf_fl.

The other patches are the versions from pu.

Karsten Blees (11):
  trace: move trace declarations from cache.h to new trace.h
  trace: consistently name the format parameter
  trace: remove redundant printf format attribute
  trace: factor out printing to the trace file
  trace: add infrastructure to augment trace output with additional info
  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

 Makefile              |   7 ++
 cache.h               |  13 +--
 config.mak.uname      |   1 +
 git-compat-util.h     |   4 +
 git.c                 |   2 +
 t/t1510-repo-setup.sh |   2 +-
 t/t5503-tagfollow.sh  |   8 +-
 trace.c               | 313 ++++++++++++++++++++++++++++++++++++++++++++------
 trace.h               |  90 +++++++++++++++
 9 files changed, 387 insertions(+), 53 deletions(-)
 create mode 100644 trace.h